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Branch Sales (Notes) | 9 Months Ended
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Sep. 30, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] | Branch Sales On August 23, 2014, Columbia completed a branch sale transaction to Sound Community Bancorp. In the transaction, Columbia sold three branches and related assets and deposit liabilities to Sound Community Bancorp. The transaction was completed with a transfer of $22.2 million in deposits to Sound Community Bancorp in exchange for a deposit premium of 2.35%. Also included in the branch sale were $1.1 million in loans and $3.8 million in premises and equipment. The Company recognized a gain of $565 thousand related to the deposit premium, which was recorded in the line item Other noninterest income in the Consolidated Statements of Income. In addition, the Company recorded a $50 thousand loss on the disposal of premises and equipment related to this transaction, which was recorded in the line item Other noninterest expense in the Consolidated Statements of Income.

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