1 Exhibit 24 2 POWER OF ATTORNEY The director of Columbia Banking System, Inc. (the "Company"), whose signature appears below, hereby appoints Arnold G. Espe, W. W. Philip and J. James Gallagher, or either of them, as his attorney to sign, in his name and behalf and in any and all capacities stated below, the Company's Form 10-K Annual Report pursuant to Section 13 of the Securities Exchange Act of 1934, and likewise to sign any and all amendments and other documents relating thereto as shall be necessary, such person hereby granting to each such attorney power to act with or without the other and full power of substitution and revocation, and hereby ratifying all that any such attorney or his substitute may do by virtue hereof. This Power of Attorney has been signed by the following person in the capacity indicated, on the 26 day of February, 1997. Signature Title /s/ W. Barry Connoley Director - --------------------------------- W. Barry Connoley 3 POWER OF ATTORNEY The director of Columbia Banking System, Inc. (the "Company"), whose signature appears below, hereby appoints Arnold G. Espe, W. W. Philip and J. James Gallagher, or either of them, as his attorney to sign, in his name and behalf and in any and all capacities stated below, the Company's Form 10-K Annual Report pursuant to Section 13 of the Securities Exchange Act of 1934, and likewise to sign any and all amendments and other documents relating thereto as shall be necessary, such person hereby granting to each such attorney power to act with or without the other and full power of substitution and revocation, and hereby ratifying all that any such attorney or his substitute may do by virtue hereof. This Power of Attorney has been signed by the following person in the capacity indicated, on the 26 day of February, 1997. Signature Title /s/ Richard S. DeVine Director - --------------------------------- Richard S. DeVine 4 POWER OF ATTORNEY The director of Columbia Banking System, Inc. (the "Company"), whose signature appears below, hereby appoints Arnold G. Espe, W. W. Philip and J. James Gallagher, or either of them, as his attorney to sign, in his name and behalf and in any and all capacities stated below, the Company's Form 10-K Annual Report pursuant to Section 13 of the Securities Exchange Act of 1934, and likewise to sign any and all amendments and other documents relating thereto as shall be necessary, such person hereby granting to each such attorney power to act with or without the other and full power of substitution and revocation, and hereby ratifying all that any such attorney or his substitute may do by virtue hereof. This Power of Attorney has been signed by the following person in the capacity indicated, on the 26 day of February, 1997. Signature Title /s/ Jack Fabulich Director - --------------------------------- Jack Fabulich 5 POWER OF ATTORNEY The director of Columbia Banking System, Inc. (the "Company"), whose signature appears below, hereby appoints Arnold G. Espe, W. W. Philip and J. James Gallagher, or either of them, as his attorney to sign, in his name and behalf and in any and all capacities stated below, the Company's Form 10-K Annual Report pursuant to Section 13 of the Securities Exchange Act of 1934, and likewise to sign any and all amendments and other documents relating thereto as shall be necessary, such person hereby granting to each such attorney power to act with or without the other and full power of substitution and revocation, and hereby ratifying all that any such attorney or his substitute may do by virtue hereof. This Power of Attorney has been signed by the following person in the capacity indicated, on the 26 day of February, 1997. Signature Title /s/ Jonathan Fine Director - --------------------------------- Jonathan Fine 6 POWER OF ATTORNEY The director of Columbia Banking System, Inc. (the "Company"), whose signature appears below, hereby appoints Arnold G. Espe, W. W. Philip and J. James Gallagher, or either of them, as his attorney to sign, in his name and behalf and in any and all capacities stated below, the Company's Form 10-K Annual Report pursuant to Section 13 of the Securities Exchange Act of 1934, and likewise to sign any and all amendments and other documents relating thereto as shall be necessary, such person hereby granting to each such attorney power to act with or without the other and full power of substitution and revocation, and hereby ratifying all that any such attorney or his substitute may do by virtue hereof. This Power of Attorney has been signed by the following person in the capacity indicated, on the 26 day of February, 1997. Signature Title /s/ Margel Gallagher Director - --------------------------------- Margel Gallagher 7 POWER OF ATTORNEY The director of Columbia Banking System, Inc. (the "Company"), whose signature appears below, hereby appoints Arnold G. Espe, W. W. Philip and J. James Gallagher, or either of them, as his attorney to sign, in his name and behalf and in any and all capacities stated below, the Company's Form 10-K Annual Report pursuant to Section 13 of the Securities Exchange Act of 1934, and likewise to sign any and all amendments and other documents relating thereto as shall be necessary, such person hereby granting to each such attorney power to act with or without the other and full power of substitution and revocation, and hereby ratifying all that any such attorney or his substitute may do by virtue hereof. This Power of Attorney has been signed by the following person in the capacity indicated, on the 26 day of February, 1997. Signature Title /s/ John A. Halleran Director - --------------------------------- John A. Halleran 8 POWER OF ATTORNEY The director of Columbia Banking System, Inc. (the "Company"), whose signature appears below, hereby appoints Arnold G. Espe, W. W. Philip and J. James Gallagher, or either of them, as his attorney to sign, in his name and behalf and in any and all capacities stated below, the Company's Form 10-K Annual Report pursuant to Section 13 of the Securities Exchange Act of 1934, and likewise to sign any and all amendments and other documents relating thereto as shall be necessary, such person hereby granting to each such attorney power to act with or without the other and full power of substitution and revocation, and hereby ratifying all that any such attorney or his substitute may do by virtue hereof. This Power of Attorney has been signed by the following person in the capacity indicated, on the 26 day of February, 1997. Signature Title /s/ Robert Quoidbach Director - --------------------------------- Robert Quoidbach 9 POWER OF ATTORNEY The director of Columbia Banking System, Inc. (the "Company"), whose signature appears below, hereby appoints Arnold G. Espe, W. W. Philip and J. James Gallagher, or either of them, as his attorney to sign, in his name and behalf and in any and all capacities stated below, the Company's Form 10-K Annual Report pursuant to Section 13 of the Securities Exchange Act of 1934, and likewise to sign any and all amendments and other documents relating thereto as shall be necessary, such person hereby granting to each such attorney power to act with or without the other and full power of substitution and revocation, and hereby ratifying all that any such attorney or his substitute may do by virtue hereof. This Power of Attorney has been signed by the following person in the capacity indicated, on the 26 day of February, 1997. Signature Title /s/ Donald Rodman Director - --------------------------------- Donald Rodman 10 POWER OF ATTORNEY The director of Columbia Banking System, Inc. (the "Company"), whose signature appears below, hereby appoints Arnold G. Espe, W. W. Philip and J. James Gallagher, or either of them, as his attorney to sign, in his name and behalf and in any and all capacities stated below, the Company's Form 10-K Annual Report pursuant to Section 13 of the Securities Exchange Act of 1934, and likewise to sign any and all amendments and other documents relating thereto as shall be necessary, such person hereby granting to each such attorney power to act with or without the other and full power of substitution and revocation, and hereby ratifying all that any such attorney or his substitute may do by virtue hereof. This Power of Attorney has been signed by the following person in the capacity indicated, on the 26 day of February, 1997. Signature Title /s/ Frank Russell Director - --------------------------------- Frank Russell 11 POWER OF ATTORNEY The director of Columbia Banking System, Inc. (the "Company"), whose signature appears below, hereby appoints Arnold G. Espe, W. W. Philip and J. James Gallagher, or either of them, as his attorney to sign, in his name and behalf and in any and all capacities stated below, the Company's Form 10-K Annual Report pursuant to Section 13 of the Securities Exchange Act of 1934, and likewise to sign any and all amendments and other documents relating thereto as shall be necessary, such person hereby granting to each such attorney power to act with or without the other and full power of substitution and revocation, and hereby ratifying all that any such attorney or his substitute may do by virtue hereof. This Power of Attorney has been signed by the following person in the capacity indicated, on the 26 day of February, 1997. Signature Title /s/ Sidney R. Snyder Director - --------------------------------- Sidney R. Snyder 12 POWER OF ATTORNEY The director of Columbia Banking System, Inc. (the "Company"), whose signature appears below, hereby appoints Arnold G. Espe, W. W. Philip and J. James Gallagher, or either of them, as his attorney to sign, in his name and behalf and in any and all capacities stated below, the Company's Form 10-K Annual Report pursuant to Section 13 of the Securities Exchange Act of 1934, and likewise to sign any and all amendments and other documents relating thereto as shall be necessary, such person hereby granting to each such attorney power to act with or without the other and full power of substitution and revocation, and hereby ratifying all that any such attorney or his substitute may do by virtue hereof. This Power of Attorney has been signed by the following person in the capacity indicated, on the 26 day of February, 1997. Signature Title /s/ James M. Will, Jr. Director - --------------------------------- James M. Will, Jr.