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Business Combinations (Tables) - Pacific Continental [Member] | 3 Months Ended
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Mar. 31, 2018
Business Acquisition [Line Items] |
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] | The table below summarizes the amounts recognized as of the acquisition date for each major class of assets acquired and liabilities assumed:
|  | November 1, 2017
|  | (in thousands)
Merger consideration |  |  |  | $ | 637,103 |
Identifiable net assets acquired, at fair value |  |  |  |
Assets acquired |  |  |  |
Cash and cash equivalents |  | $ | 81,190 |  |  |
Investment securities |  | 449,291 |  |  |
Federal Home Loan Bank stock |  | 7,084 |  |  |
Loans |  | 1,873,987 |  |  |
Interest receivable |  | 7,827 |  |  |
Premises and equipment |  | 27,343 |  |  |
Other real estate owned |  | 10,279 |  |  |
Core deposit intangible |  | 46,875 |  |  |
Other assets |  | 50,638 |  |  |
Total assets acquired |  |  |  | 2,554,514 |
Liabilities assumed |  |  |  |
Deposits |  | (2,118,982 | ) |  |
Federal Home Loan Bank advances |  | (101,127 | ) |  |
Subordinated debentures |  | (35,678 | ) |  |
Junior subordinated debentures |  | (14,434 | ) |  |
Securities sold under agreements to repurchase |  | (1,617 | ) |  |
Other liabilities |  | (28,653 | ) |  |
Total liabilities assumed |  |  |  | (2,300,491 | )
Total fair value of identifiable net assets, at fair value |  |  |  | 254,023 |
Goodwill |  |  |  | $ | 383,080 |
Business Acquisition, Pro Forma Information [Table Text Block] | For illustrative purposes only, the following table presents certain unaudited pro forma information for the three months ended March 31, 2017. This unaudited estimated pro forma financial information was calculated as if Pacific Continental had been acquired as of the beginning of the year prior to the date of acquisition. This unaudited pro forma information combines the historical results of Pacific Continental with the Company’s consolidated historical results and includes certain adjustments reflecting the estimated impact of certain fair value adjustments for the respective periods. The pro forma information is not indicative of what would have occurred had the acquisition occurred as of the beginning of the year prior to the acquisition. In particular, no adjustments have been made to eliminate the impact of other-than-temporary impairment losses and losses recognized on the sale of securities that may not have been necessary had the investment securities been recorded at fair value as of the beginning of the year prior to the date of acquisition. The unaudited pro forma information does not consider any changes to the provision for credit losses resulting from recording loan assets at fair value. Additionally, Columbia expects to achieve further operating cost savings and other business synergies, including revenue growth as a result of the acquisition, which are not reflected in the pro forma amounts that follow. As a result, actual amounts would have differed from the unaudited pro forma information presented.
|  | Unaudited Pro Forma
|  | Three Months Ended March 31,
|  | 2017
|  | (in thousands except per share)
Total revenues (net interest income plus noninterest income) |  | $ | 139,363 |
Net income |  | $ | 37,147 |
Earnings per share - basic |  | $ | 0.52 |
Earnings per share - diluted |  | $ | 0.52 |
Business Acquisition, Integration, Restructuring and Other Related Costs [Text Block] | The following table shows the impact of the acquisition-related expenses related to the acquisition of Pacific Continental for the periods indicated to the various components of noninterest expense:
|  | Three Months Ended March 31,
|  | 2018 |  | 2017
|  | (in thousands)
Noninterest Expense |  |  |  |
Compensation and employee benefits |  | $ | 1,556 |  |  | $ | — |
Occupancy |  | 1,004 |  |  | 1 |
Advertising and promotion |  | 512 |  |  | 6 |
Data processing |  | 287 |  |  | — |
Legal and professional fees |  | 574 |  |  | 1,311 |
Other |  | 332 |  |  | 46 |
Total impact of acquisition-related costs to noninterest expense |  | $ | 4,265 |  |  | $ | 1,364 |

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- Definition The entire description for costs incurred to effect a business combination that have been expensed during the period. Such costs could include business integration costs, systems integration and conversion costs, and severance and other employee-related costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -URI http://asc.fasb.org/topic&trid=2303972 + Details
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- Definition Tabular disclosure of the amounts recognized as of the acquisition date for each major class of assets acquired and liabilities assumed. May include but not limited to the following: (a) acquired receivables; (b) contingencies recognized at the acquisition date; and (c) the fair value of noncontrolling interests in the acquiree. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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