WEST COAST BANCORP /NEW Contracts & Agreements

AGREEMENT AND PLAN OF MERGER by and among COLUMBIA BANKING SYSTEM, INC. WEST COAST BANCORP and SUB (as defined herein) Dated as of September 25, 2012 TABLE OF CONTENTS (Filed With SEC on October 1, 2012)

Amendment No. 1 To Tax Benefit Preservation Plan (Filed With SEC on October 1, 2012)

WEST COAST BANCORP 2012 OMNIBUSINCENTIVE PLAN (Filed With SEC on May 8, 2012)

FEDERAL DEPOSIT INSURANCE CORPORATION WASHINGTON, D.C. (Filed With SEC on October 24, 2011)

EMPLOYMENTAGREEMENT FOR ROBERTD. SZNEWAJS EffectiveDate:January 1, 2011 WestCoast Bancorp and WestCoast Bank TABLE OFCONTENTS (Filed With SEC on January 14, 2011)

WESTCOAST BANK SUPPLEMENTALEXECUTIVE RETIREMENT PLAN (SERP) EffectiveDate:August 1, 2003 RestatedJanuary 1, 2011 (Filed With SEC on January 14, 2011)

UNITED STATES OF AMERICA BEFORE THE BOARD OF GOVERNORS OF THE FEDERAL RESERVE SYSTEM WASHINGTON, D.C. STATE OF OREGON DEPARTMENT OF CONSUMER AND BUSINESS SERVICES, DIVISION OF... (Filed With SEC on December 21, 2009)

CLASS BWARRANT (Filed With SEC on October 28, 2009)

CLASS C WARRANT (Filed With SEC on October 28, 2009)

CLASS D WARRANT (Filed With SEC on October 28, 2009)

West Coast Bancorp and Wells Fargo Bank, National Association Tax Benefit Preservation Plan Dated as of October 23, 2009 (Filed With SEC on October 28, 2009)

INVESTMENT AGREEMENT dated as of October 23, 2009 between WEST COAST BANCORP and [ ] (Filed With SEC on October 28, 2009)

FEDERAL DEPOSIT INSURANCECORPORATION WASHINGTON, D.C. OREGON DIVISION OF FINANCEAND CORPORATE SECURITIES SALEM, OREGON (Filed With SEC on October 28, 2009)

FEDERALDEPOSIT INSURANCE CORPORATION WASHINGTON,D.C. OREGONDIVISION OF FINANCE AND CORPORATE SECURITIES SALEM,OREGON (Filed With SEC on October 28, 2009)

WEST COAST BANCORP 2002 STOCKINCENTIVE PLAN (As amended throughApril 28, 2009) (Filed With SEC on August 7, 2009)

INDEMNIFICATION AGREEMENT (Filed With SEC on February 24, 2009)

CHANGE IN CONTROLAGREEMENT 2008 Restatement Effective Date: January 1,2004, As Amended and Restated December 30, 2008, For Compliance with Code 409A (Filed With SEC on February 24, 2009)

CHANGE IN CONTROL AGREEMENT 2008 Restatement Effective Date: January 1,2004, As Amended and Restated December 30, 2008, For Compliance with Code 409A (Filed With SEC on February 24, 2009)

CHANGE IN CONTROL AGREEMENT 2008 Restatement Effective Date: January 1, 2004, As Amended and Restated December 30, 2008, For Compliance with Code 409A (Filed With SEC on February 24, 2009)

CHANGE IN CONTROLAGREEMENT 2008Restatement Effective Date: January 1,2004, As Amended and Restated December 30, 2008, For Compliance with Code 409A (Filed With SEC on February 24, 2009)

CHANGE IN CONTROL AGREEMENT 2008 Restatement Effective Date: January 1, 2004, As Amended and Restated December 30, 2008, For Compliance with Code 409A (Filed With SEC on February 24, 2009)

WEST COASTBANK SUPPLEMENTAL EXECUTIVE RETIREMENTPLAN (SERP) Effective Date: August 1, 2003, AsRestated and Amended January 1, 2009 (Filed With SEC on February 24, 2009)

WEST COASTBANK SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN (SERP) Effective Date: August 1, 2003, AsRestated and Amended January 1, 2009 (Filed With SEC on February 24, 2009)

WEST COASTBANK SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN (SERP) Effective Date: April 1,2007, As Restated and Amended January 1, 2009 (Filed With SEC on February 24, 2009)

WEST COASTBANCORP DIRECTORS DEFERREDCOMPENSATION PLAN (2008Restatement) Originally Effective as of January 1,2005 Restated Effective as of November 7,2008 for Compliance with IRC... (Filed With SEC on February 24, 2009)

WEST COAST BANCORP EXECUTIVESDEFERRED COMPENSATION PLAN (2008Restatement) Originally Effective as of January 1, 2005 Restated Effective as of November 7,2008 for Compliance with... (Filed With SEC on February 24, 2009)

RESTRICTED STOCK PERFORMANCE AWARDAGREEMENT (EMPLOYEE) (Filed With SEC on August 6, 2008)

CHANGE IN CONTROL AGREEMENT Effective Date: March 5, 2007 (Filed With SEC on May 2, 2007)

WEST COAST BANK SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN (SERP) Effective Date: April 1, 2007 (Filed With SEC on May 2, 2007)

AMENDMENT NO. 3 TO WEST COAST BANCORP 2002 STOCK INCENTIVE PLAN (Filed With SEC on November 7, 2006)

WESTCOAST BANCORP 2002 STOCK INCENTIVE PLAN (As amended through September 27, 2006) (Filed With SEC on November 7, 2006)

OPTION AGREEMENT FOR INCENTIVE STOCK OPTION (EMPLOYEE) (Filed With SEC on November 7, 2006)

OPTION AGREEMENT FOR NONQUALIFIED STOCK OPTION (EMPLOYEE) (Filed With SEC on November 7, 2006)

RESTRICTED STOCK AWARD AGREEMENT (EMPLOYEE) (Filed With SEC on November 7, 2006)

OPTION AGREEMENT FORNONQUALIFIED STOCK OPTION (DIRECTOR) (Filed With SEC on November 7, 2006)

RESTRICTED STOCK AWARD AGREEMENT (DIRECTOR) (Filed With SEC on November 7, 2006)

WEST COAST BANCORP 2002 STOCK INCENTIVE PLAN (As amended February 28, 2006) (Filed With SEC on August 8, 2006)

RESTRICTED STOCK AWARD AGREEMENT (EMPLOYEE) (Filed With SEC on August 8, 2006)

OPTION AGREEMENT FOR INCENTIVE STOCK OPTION (EMPLOYEE) (Filed With SEC on August 8, 2006)

OPTION AGREEMENT FOR NONQUALIFIED STOCK OPTION (EMPLOYEE) (Filed With SEC on August 8, 2006)

What is the purpose of this proxy statement/ prospectus (Filed With SEC on March 23, 2006)

Summary of Director Compensation Policies (As of February 10, 2006) (Filed With SEC on February 10, 2006)

AMENDMENT NO. 1 TO THE WEST COAST BANK SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN FOR JAMES D. BYGLAND Adopted: On date of last signature below Effective: July 1, 2005 RECITALS (Filed With SEC on November 7, 2005)

AMENDMENT NO. 1 TO THE WEST COAST BANK SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN FOR ANDERS GILTVEDT Adopted: On date of last signature below Effective: July 1, 2005 RECITALS (Filed With SEC on November 7, 2005)

AMENDMENT NO. 1 TO THE WEST COAST BANK SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN FOR XANDRA MCKEOWN Adopted: On date of last signature below Effective: July 1, 2005 RECITALS (Filed With SEC on November 7, 2005)

AMENDMENT NO. 1 TO THE WEST COAST BANK SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN FOR DAVID L. PRYSOCK Adopted: On date of last signature below Effective: July 1, 2005 RECITALS (Filed With SEC on November 7, 2005)

AMENDMENT NO. 1 TO THE WEST COAST BANK SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN FOR ROBERT D. SZNEWAJS Adopted: On date of last signature below Effective: July 1, 2005 RECITALS (Filed With SEC on November 7, 2005)

Summary of Director Compensation Policies (As of May 1, 2005) (Filed With SEC on May 9, 2005)

Exhibit 10.9 AMENDMENT NO. 2 (FREEZE AMENDMENT) TO THE WEST COAST BANCORP DIRECTORS DEFERRED COMPENSATION PLAN Adopted: December 14, 2004 Effective: December 31, 2004 RECITALS (Filed With SEC on March 7, 2005)

Exhibit 10.11 AMENDMENT NO. 4 (FREEZE AMENDMENT) TO THE WEST COAST BANCORP EXECUTIVES DEFERRED COMPENSATION PLAN Adopted: December 14, 2004 Effective: December 31, 2004 RECITALS (Filed With SEC on March 7, 2005)

Exhibit 10.26 WEST COAST BANCORP DIRECTORS DEFERRED COMPENSATION PLAN (Interim Plan Document for Operational Compliance with the American Jobs Creation Act) Effective as of... (Filed With SEC on March 7, 2005)

Exhibit 10.27 WEST COAST BANCORP EXECUTIVES DEFERRED COMPENSATION PLAN (Interim Plan Document for Operational Compliance with the American Jobs Creation Act) Effective as of... (Filed With SEC on March 7, 2005)

Exhibit 10.28 Summary of Director Compensation Policies (Filed With SEC on March 7, 2005)

Exhibit 10.29 EMPLOYMENT AGREEMENT FOR ROBERT D. SZNEWAJS Effective Date: January 1, 2005 West Coast Bancorp and West Coast Bank (Filed With SEC on March 7, 2005)

Dollars and shares in thousands (Filed With SEC on May 10, 2004)

Forward Looking Statement Disclosure (Filed With SEC on February 26, 2004)

Financial Information (Filed With SEC on August 14, 2002)

Legal Proceedings (Filed With SEC on March 1, 2002)

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WEST COAST BANCORP /NEW Contracts & Agreements