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Business Combinations | 12 Months Ended
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Dec. 31, 2016
Business Acquisition [Line Items] |
Business Combination Disclosure [Text Block] | Business Combinations Intermountain Community Bancorp On November 1, 2014, the Company completed its acquisition of Intermountain Community Bancorp (“Intermountain”) and its wholly-owned banking subsidiary Panhandle State Bank. The Company acquired 100% of the equity interests of Intermountain. The primary reason for the acquisition was to expand the Company's geographic footprint into the state of Idaho, consistent with its ongoing growth strategy. The assets acquired and liabilities assumed have been accounted for under the acquisition method of accounting. The assets and liabilities, both tangible and intangible, were recorded at their fair values as of the November 1, 2014 acquisition date. The application of the acquisition method of accounting resulted in the recognition of goodwill of $38.8 million and a core deposit intangible of $10.9 million, or 1.75% of core deposits. The goodwill represents the excess purchase price over the fair value of the net assets acquired. The goodwill is not deductible for income tax purposes. The table below summarizes the amounts recognized as of the acquisition date for each major class of assets acquired and liabilities assumed:
|  | November 1, 2014
|  | (in thousands)
Purchase price as of November 1, 2014 |  | $ | 131,935 |
Recognized amounts of identifiable assets acquired and (liabilities assumed), at fair value: |  |
Cash and cash equivalents |  | $ | 47,283 |
Investment securities |  | 299,458 |
Federal Home Loan Bank stock |  | 2,124 |
Acquired loans |  | 502,595 |
Interest receivable |  | 4,656 |
Premises and equipment |  | 20,696 |
Other real estate owned |  | 2,752 |
Core deposit intangible |  | 10,900 |
Other assets |  | 35,128 |
Deposits |  | (736,795 | )
Other borrowings |  | (22,904 | )
Securities sold under agreements to repurchase |  | (59,043 | )
Other liabilities |  | (13,725 | )
Total fair value of identifiable net assets |  | 93,125 |
Goodwill |  | $ | 38,810 |
See Note 10, “Goodwill and Other Intangible Assets”, for further discussion of the accounting for goodwill and other intangible assets. The operating results of the Company reported herein include the operating results produced by the acquired assets and assumed liabilities for the period November 1, 2014 to December 31, 2016. Disclosure of the amount of Intermountain’s revenue and net income (excluding integration costs) included in Columbia’s Consolidated Statements of Income is impracticable due to the integration of the operations and accounting for this acquisition. For illustrative purposes only, the following table presents certain unaudited pro forma information for the year ended December 31, 2014. This unaudited estimated pro forma financial information was calculated as if Intermountain 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 Intermountain 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
|  | Year Ended December 31,
|  | 2014
|  | (in thousands except per share)
Total revenues (net interest income plus noninterest income) |  | $ | 397,152 |
Net income |  | $ | 85,939 |
Earnings per share - basic |  | $ | 1.56 |
Earnings per share - diluted |  | $ | 1.55 |
The following table shows the impact of the acquisition-related expenses related to the acquisition of Intermountain for the periods indicated to the various components of noninterest expense:
|  | Year ended December 31,
|  | 2016 |  | 2015 |  | 2014
|  | (in thousands)
Noninterest Expense |  |  |  |  |  |
Compensation and employee benefits |  | $ | 35 |  |  | $ | 3,828 |  |  | $ | 2,077 |
Occupancy |  | 2,383 |  |  | 2,357 |  |  | 44 |
Advertising and promotion |  | — |  |  | 448 |  |  | 464 |
Data processing |  | 18 |  |  | 2,005 |  |  | — |
Legal and professional fees |  | — |  |  | 1,247 |  |  | 2,114 |
Other |  | — |  |  | 960 |  |  | 197 |
Total impact of acquisition-related costs to noninterest expense |  | $ | 2,436 |  |  | $ | 10,845 |  |  | $ | 4,896 |

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- Definition The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1497-128463 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1490-128463 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1486-128463 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 7: 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=73530397&loc=d3e4845-128472 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1524-128463 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7000-128479 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4922-128472 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4934-128472 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4926-128472 Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 4A -URI http://asc.fasb.org/extlink&oid=73530397&loc=SL65897772-128472 Reference 14: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1383-128463 Reference 15: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6996-128479 + Details
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