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Shareholders' Equity	9 Months Ended
Shareholders' Equity	Sep. 30, 2018
Stockholders' Equity Note [Abstract]
Shareholders' Equity	Shareholders’ Equity Dividends: On January 25, 2018, the Company declared a regular quarterly cash dividend of $0.22 per common share payable on February 21, 2018 to shareholders of record at the close of business on February 7, 2018. On April 25, 2018, the Company declared a regular quarterly cash dividend of $0.26 per common share payable on May 23, 2018 to shareholders of record at the close of business on May 9, 2018. On July 25, 2018, the Company declared a regular quarterly cash dividend of $0.26 per common share payable on August 22, 2018 to shareholders of record at the close of business on August 8, 2018. Subsequent to quarter end, on October 25, 2018, the Company declared a regular quarterly cash dividend of $0.26 per common share and a special cash dividend of $0.14 per common share payable on November 21, 2018 to shareholders of record at the close of business on November 7, 2018. The payment of cash dividends is subject to federal regulatory requirements for capital levels and other restrictions. In addition, the cash dividends paid by Columbia Bank to the Company are subject to both federal and state regulatory requirements.