POWER OF ATTORNEY / CONFORMING STATEMENT



      This Statement confirms that the undersigned, has authorized and
designated Melanie J. Dressel, Cathleen Dent and Marita Robbins, each with the
full power to act alone, to execute and file on the undersigned's behalf, all
Form's 3, 4 and 5 (including any amendments thereto) that the undersigned may be
required to file with the U. S. Securities and Exchange Commission as a result
of the undersigned's ownership of or transactions in securities of Columbia
Banking System, Inc.  The authority of Melanie J. Dressel, Cathleen Dent and
Marita Robbins under this Statement shall continue until the undersigned is no
longer required to file Forms 3, 4 and 5 with regard to his/her ownership of or
transactions in securities of Columbia Banking System, Inc., unless earlier
revoked in writing.  The undersigned acknowledges that none of Columbia Banking
System, Inc., Melanie J. Dressel, Cathleen Dent or Marita Robbins is assuming
any of the undersigned's responsibilities to comply with Section 16 of the
Securities and Exchange Act of 1934.



IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of March 10, 2014

                             Signature:/s/Hadley Robbins
                                       ----------------------
                                        Hadley Robbins