FORM OF NBH HOLDINGS CORP. 2009 EQUITY INCENTIVE PLAN NONQUALIFIED STOCK OPTION AGREEMENT (FOR MANAGEMENT)

Exhibit 10.15

FORM OF

NBH HOLDINGS CORP.

2009 EQUITY INCENTIVE PLAN

NONQUALIFIED STOCK OPTION AGREEMENT

(FOR MANAGEMENT)

THIS OPTION AGREEMENT (this “Agreement”), dated as of October 20, 2009 (the “Date of Grant”), is made by and between NBH Holdings Corp., a Delaware corporation (the “Company”), and                    (“Participant”).

WHEREAS, the Company has adopted the NBH Holdings Corp. 2009 Equity Incentive Plan (the “Plan”), pursuant to which nonqualified stock options may be granted to purchase shares of the Company’s common stock, par value $0.01 per share (“Common Stock”); and

WHEREAS, the Committee has determined that it would be in the best interests of the Company and its stockholders to grant Participant non qualified stock options on the terms and subject to the conditions set forth in this Agreement and the Plan.

NOW, THEREFORE, for and in consideration of the premises and the covenants of the parties contained in this Agreement, and for other good and valuable consideration, the receipt of which is hereby acknowledged, the parties hereto, for themselves, their successors and assigns, hereby agree as follows:

1. Grant of Option.

(a) Grant. The Company hereby grants to Participant a nonqualified stock option (the “Option” and any portion thereof, the “Options”) to purchase [—] shares of Common Stock (such shares of Common Stock, the “Shares”), on the terms and conditions set forth in this Agreement and as otherwise provided in the Plan. The Option is not intended to qualify as an incentive stock option within the meaning of Section 422 of the Internal Revenue Code (the “Code”).

(b) Incorporation by Reference, Etc. The provisions of the Plan are hereby incorporated herein by reference. Except as otherwise expressly set forth herein, this Agreement shall be construed in accordance with the provisions of the Plan and any capitalized terms not otherwise defined in this Agreement shall have the definitions set forth in the Plan.

2. Option; Option Price.

(a) Option Price. The option price, being the price at which Participant shall be entitled to purchase the Shares upon the exercise of all or any of the Options, shall be $20.00 per Share (the “Option Price”).

(b) Payment of the Option Price. The Option may be exercised only by written notice, substantially in the form provided by the Company, delivered in person or by mail in accordance with Section 12(c) hereof and accompanied by payment of the Option Price. The Option Price shall be payable in cash, or, to the extent permitted by the Committee, by any of the other methods permitted under Section 7(b) of the Plan.

3. Vesting. Except as may otherwise be provided herein, the Option shall become non-forfeitable (any Options that shall have become non forfeitable pursuant to this Section 3, the “Vested Options”) and shall become exercisable according to the following provisions, subject to Participant’s continued employment with the Company as of any such date:

(a) General Vesting. (i) One-half of the Options shall become Vested Options and shall become exercisable on the later of (x) the second anniversary of the Date of Grant and (y) the occurrence of a Qualified Investment Transaction, subject to Participant not having incurred a Termination of Service prior to such later date, and (ii) one-half of the Options shall become Vested Options and shall become exercisable on the later of (x) the third anniversary of the Date of Grant and (y) the occurrence of a Qualified Investment Transaction, subject to Participant not having incurred a Termination of Service prior to such later date.

(b) Termination of Service. Except as provided in the immediately following sentence, in the event that Participant incurs a Termination of Service, any Options that have not theretofore become Vested Options (such Options, the “Unvested Options”) shall be forfeited without consideration by Participant. Notwithstanding the foregoing, in the event that subsequent to the occurrence of a Qualified Investment Transaction, Participant incurs a Termination of Service without [“Cause” or for “Good Reason” (each as defined in Participant’s employment agreement with the Company, dated as of June 30, 2009) (the “Employment Agreement”)]¹[“Cause” (as defined in Section 13(a) below) or for “Good Reason” (as defined in Section 13(c) below)],² any Unvested Option that is outstanding immediately prior to such Termination of Service shall vest in full effective as of the date of Termination of Service.

(c) Qualified Investment Transaction. Notwithstanding the foregoing provisions of this Section 3, no Options shall vest or become exercisable prior to the Company’s consummation of a Qualified Investment Transaction and in the event that the Company does not consummate a Qualified Investment Transaction by the Investment Transaction Deadline, any Option held by Participant shall be forfeited without any consideration.

4. Conversion into Class B Common Stock. By entering into this Agreement, Participant acknowledges and agrees that in the event that any Shares received by Participant upon the exercise of any Options that would cause Participant to own more than the percentage of Common Stock permitted by the Company’s Articles of Incorporation (the “Class A Limit”), such number of Shares otherwise held by Participant as may be necessary in order to cause Participant to not exceed the Class A Limit shall be converted into shares of Class B common stock of the Company.

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5. Termination.

(a) The Option shall automatically terminate and shall become null and void, be unexercisable and be of no further force and effect upon the earliest of:

(i) the tenth anniversary of the Date of Grant;

(ii) the first anniversary following Participant’s Termination of Service, in the case of a Termination of Service due to death or Disability [(as defined in Section 13(b) below)]³ [(as defined in the Employment Agreement)];⁴

(iii) the 180^th day following Participant’s Termination of Service in the case of a Termination of Service without Cause or for Good Reason; and

(iv) the day of Participant’s Termination of Service in the case of a Termination of Service for Cause or without Good Reason.

(b) Notwithstanding the provisions of Section 5(a) to the contrary, in the event of Participant’s Termination of Service for any reason (other than due to a Termination of Service for Cause) during the two-year period following a Change in Control, the Option shall remain outstanding and exercisable until the earlier of (i) the tenth anniversary of the Date of Grant and (ii) the fifth anniversary of such Termination of Service.

(c) Except as otherwise provided in the Plan and Section 3(b) of this Agreement, upon a Termination of Service for any reason, any Unvested Options shall immediately terminate and be forfeited on the date the Termination of Service occurs.

6. Securities Law Representations. Participant acknowledges that the Option and the Shares are not being registered under the Securities Act, based, in part, on reliance upon an exemption from registration under Rule 701 or Regulation D promulgated under the Securities Act and a comparable exemption from qualification under applicable state securities laws, as each may be amended from time to time. Participant, by executing this Agreement, hereby makes the following representations to the Company and acknowledges that the Company’s reliance on federal and state securities law exemptions from registration and qualification is predicated, in substantial part, upon the accuracy of these representations:

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7. Compliance with Legal Requirements. The grant and exercise of the Option, and any other obligations of the Company under this Agreement shall be subject to all applicable federal and state laws, rules and regulations and to such approvals by any regulatory or governmental agency as may be required. The Committee, in its sole discretion, may postpone the issuance or delivery of Shares as the Committee may consider appropriate and may require Participant to make such representations and furnish such information as it may consider appropriate in connection with the issuance or delivery of the Shares in compliance with applicable laws, rules and regulations.

8. Transferability. The Option may not be assigned, alienated, pledged, attached, sold or otherwise transferred or encumbered by Participant other than by will or by the laws of descent and distribution and any such purported assignment, alienation, pledge, attachment, sale, transfer or encumbrance shall be void and unenforceable against the Company, its Subsidiary or Affiliate; provided that the designation of a beneficiary shall not constitute an assignment, alienation, pledge, attachment, sale, transfer or encumbrance. The Option and any Shares received upon exercise thereof shall be subject to the restrictions set forth in the Plan and this Agreement. Prior to the Shares becoming listed on an Applicable Exchange, except as provided in Section 11 below, any Shares received upon exercise of the Option may not be assigned, alienated, pledged, attached, sold or otherwise transferred or encumbered by Participant without the prior written approval of the Board, such approval not to be unreasonable withheld.

9. Adjustment. In the event of any event described in Section 13 of the Plan occurring after the Date of Grant, the adjustment provisions as provided for under Section 13 of the Plan shall apply to the Option.

10. Change in Control. In the event of a Change in Control of the Company occurring after the Date of Grant, the provisions set forth in Section 14 of the Plan shall apply to the Option.

11. Tax Withholding. As a condition to exercising the Option, in whole or in part, Participant will pay to the Company, or, pursuant to Section 12(d) of the Plan, make provisions satisfactory to the Company for payment of, any federal, state or local tax laws in respect of the exercise or the transfer of the Shares. Participant may elect to have any withholding obligation satisfied by surrendering to the Company a portion of the Shares that is issued or transferred to Participant upon the exercise of any Options (but only to the extent of the minimum withholding required by law) and the Shares so surrendered by Participant shall be credited against any such withholding obligation at the Fair Market Value of such Shares on the date of such surrender (and the amount equal to the Fair Market Value of such Shares shall be remitted to the appropriate tax authorities).

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12. Miscellaneous.

(a) Confidentiality of this Agreement. Participant agrees to keep confidential the terms of this Agreement, unless and until such terms have been disclosed publicly other than through a breach by Participant of this covenant. This provision does not prohibit Participant from providing this information on a confidential and privileged basis to Participant’s attorneys or accountants for purposes of obtaining legal or tax advice or as otherwise required by law.

(b) Waiver and Amendment. The Committee may waive any conditions or rights under, or amend any terms of, this Agreement and the Option granted thereunder; provided that any such waiver or amendment that would impair the rights of any Participant or any holder or beneficiary of any Option theretofore granted shall not to that extent be effective without the consent of Participant. No waiver of any right hereunder by any party shall operate as a waiver of any other right, or as a waiver of the same right with respect to any subsequent occasion for its exercise, or as a waiver of any right to damages. No waiver by any party of any breach of this Agreement shall be held to constitute a waiver of any other breach or a waiver of the continuation of the same breach.

(c) Notices. All notices, demands and other communications provided for or permitted hereunder shall be made in writing and shall be by registered or certified first-class mail, return receipt requested, facsimile, courier service or personal delivery:

if to the Company:

NBH Holdings Corp.

101 Federal Street, Suite 1900

Boston, MA

Facsimile: (617)  ###-###-####

Attention: James B. Fitzgerald

if to Participant: at the address last on the records of the Company

All such notices, demands and other communications shall be deemed to have been duly given when delivered by hand, if personally delivered; when delivered by courier, if delivered by commercial courier service; five business days after being deposited in the mail, postage prepaid, if mailed; and when receipt is mechanically acknowledged, if by facsimile.

(d) Registration. In the event that the Shares are listed on an Applicable Exchange, then the Company shall, upon Participant’s request, use commercially reasonable efforts to (i) file a shelf registration statement with the Securities Exchange Commission to register for resale the Shares that the Participant has received or receives upon exercise of the Option and (ii) cause such shelf registration statement to be declared effective.

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(e) Severability. The invalidity or unenforceability of any provision of this Agreement shall not affect the validity or enforceability of any other provision of this Agreement, and each other provision of this Agreement shall be severable and enforceable to the extent permitted by law.

(f) No Rights to Service. Nothing contained in this Agreement shall be construed as giving Participant any right to be retained, in any position, as an employee, consultant or director of the Company or its Affiliates or shall interfere with or restrict in any way the right of the Company or its Affiliates, which is hereby expressly reserved, to remove, terminate or discharge Participant at any time for any reason whatsoever.

(g) Beneficiary. Participant may file with the Company a written designation of a beneficiary on such form as may be prescribed by the Committee and may, from time to time, change or revoke such designation by filing a new designation with the Company. The last such designation received by the Company shall be controlling; provided, however, that no designation, or change or revocation thereof, shall be effective unless received by the Company prior to Participant’s death, and in no event shall it be effective as of a date prior to such receipt. If no beneficiary designation is filed by Participant, the beneficiary shall be deemed to be his spouse or, if Participant is unmarried at the time of death, his estate.

(h) Successors. The terms of this Agreement shall be binding upon and inure to the benefit of the Company, its successors and assigns, and of Participant and the beneficiaries, executors, administrators, heirs and successors of Participant.

(i) Entire Agreement. This Agreement and the Plan contain the entire agreement and understanding of the parties hereto with respect to the subject matter contained herein and supersede all prior communications, representations and negotiations with respect thereto. [Notwithstanding anything to the contrary in the Employment Agreement, Participant acknowledges and agrees that the terms of the Option shall be governed by this Agreement, rather than the provisions of Sections 4(d) and 6 of the Employment Agreement and, in the event of a conflict between the Employment Agreement and this Agreement, this Agreement shall control. If requested by the Company, Participant agrees that he shall enter into any such amendments to the Employment Agreement as may be necessary to reflect and effectuate the foregoing.]⁵

(j) Bound by the Plan. By signing this Agreement, Participant acknowledges that he has received a copy of the Plan and has had an opportunity to review the Plan and agrees to be bound by all the terms and provisions of the Plan.

(k) Governing Law. This Agreement shall be construed and interpreted in accordance with the internal laws of the State of Delaware without regard to principles of conflicts of law thereof, or principles of conflicts of laws of any other jurisdiction that could cause the application of the laws of any jurisdiction other than the State of Delaware.

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(l) Headings. The headings of the Sections hereof are provided for convenience only and are not to serve as a basis for interpretation or construction and shall not constitute a part of this Agreement.

(m) Signature in Counterparts. This Agreement may be signed in counterparts, each of which shall be an original, with the same effect as if the signatures thereto and hereto were upon the same instrument.

13. [Definitions.

(a) “Cause” shall mean:

(i) the continued failure of Participant to perform substantially Participant’s duties with the Company (other than any such failure resulting from incapacity due to physical or mental illness);

(ii) willful serious misconduct or gross neglect by Participant in the performance of his duties to the Company;

(iii) Participant’s continued failure to adhere materially to the clear directions of the Board, to adhere materially to the Company’s material written policies or to devote substantially all of Participant’s business time and efforts to the Company;

(iv) Participant’s conviction of or formal admission to or plea of guilty or nolo contendere to a charge of commission of (A) a felony or (B) any crime involving serious moral turpitude; or

(v) Participant’s material and willful breach of any of the material terms and conditions of any employment agreement by and between Participant and the Company.

In order to invoke a termination for Cause on any of the grounds enumerated in this Section 13 (a) the Company must provide written notice to Participant of the existence of such grounds within 30 days following the Company’s knowledge of the existence of such grounds, specifying in reasonable detail the grounds constituting Cause, and, with respect to the grounds enumerated under Section 13(a)(i), (ii), (iii) or (v), Participant shall have 30 days following receipt of such written notice (the “Participant’s Cure Period”) during which he may remedy the ground if such ground is reasonably subject to cure.

For purposes of this provision, no act or failure to act, on the part of Participant, shall be considered “willful” unless it is done, or omitted to be done, by Participant in bad faith or without reasonable belief that Participant’s action or omission was in the best interests of the Company. Any act, or failure to act, based upon authority given pursuant to a resolution duly adopted by the Board or upon the advice of counsel for the Company shall be conclusively presumed to be done, or omitted to be done, by Participant in good faith and in the best interests of the Company. The cessation of employment of Participant shall not be deemed to be for Cause unless and until there shall have been delivered to Participant a copy of a resolution duly adopted by the affirmative vote of not less than a majority of the entire membership of the Board

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at a meeting of the Board called and held for such purpose (after reasonable notice is provided to Participant and Participant is given an opportunity, together with counsel, to be heard before the Board), finding that, in the good faith opinion of the Board, Participant is guilty of the conduct described in clause (i), (ii), (iii) or (v) above, and specifying the particulars thereof in detail.

(b) “Disability” shall mean the inability of Participant to perform Participant’s duties with the Company on a full-time basis as a result of incapacity due to mental or physical illness, which inability exists for 180 days during any rolling 12-month period, as determined by a physician selected by the Company or its insurers and acceptable to Participant or Participant’s legal representative.

(c) “Good Reason” shall mean, in the absence of Participant’s written consent:

(i) a material diminution in Participant’s annual base salary;

(ii) the assignment to Participant of any duties materially inconsistent with Participant’s positions (including status, offices, titles and reporting requirements), authority, duties or responsibilities, or any other action by the Company that results in a material diminution in such positions, authority, duties or responsibilities;

(iii) any requirement by the Company that Participant’s services be rendered at a location other than at the Company’s primary office location in Boston, Massachusetts (which, for the avoidance of doubt, shall include such temporary office in Boston, Massachusetts as established by the Company prior to the Company’s having established a primary office in Boston, Massachusetts), subject to Participant’s performance of duties at, and travel to, such other offices of the Company and subsidiaries and controlled affiliates and/or other locations as shall be necessary to fulfill his duties; or

(iv) any other material breach of any written employment agreement by and between Participant and the Company.

In order to invoke a termination for Good Reason, Participant shall provide written notice to the Company of the existence of one or more of the conditions described in clauses (i) through (iv) within 30 days following Participant’s knowledge of the initial existence of such condition or conditions, specifying in reasonable detail the conditions constituting Good Reason, and the Company shall have 30 days following receipt of such written notice (the “Cure Period” ) during which it may remedy the condition if such condition is reasonably subject to cure. In the event that the Company fails to remedy the condition constituting Good Reason during the applicable Cure Period, Participant’s “separation from service” (within the meaning of Section 409A of the Code) must occur, if at all, within 30 days following such Cure Period in order for such termination as a result of such condition to constitute a termination for Good Reason.]⁶

[Remainder of page intentionally left blank; signature page to follow]

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IN WITNESS WHEREOF, the parties hereto have executed this Agreement.

[Signature Page to Nonqualified Stock Option Agreement]