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Regulatory Capital Requirements (Tables) | 12 Months Ended
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Dec. 31, 2016
Regulatory Capital Requirements [Abstract] |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations | As of December 31, 2016, the most recent notification from the Federal Deposit Insurance Corporation categorized Columbia Bank as well-capitalized under the regulatory framework for prompt corrective action. To be categorized as well- capitalized, an institution must maintain minimum CET1 risk-based, Tier 1 risk-based, total risk-based and Tier 1 leverage ratios as set forth in the following table. There are no conditions or events since the notification that management believes have changed Columbia Bank’s category. The Company and its banking subsidiary’s actual capital amounts and ratios as of December 31, 2016 and 2015 are presented in the following table:
|  | Actual |  | For Capital Adequacy Purposes |  | To Be Well Capitalized Under Prompt Corrective Action Provision
Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio
|  | (dollars in thousands)
As of December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |
CET1 Capital (to risk-weighted assets): |  |  |  |  |  |  |  |  |  |  |  |
The Company |  | $ | 873,217 |  |  | 11.6450 | % |  | $ | 337,439 |  |  | 4.5 | % |  | N/A |  |  | N/A |
Columbia Bank |  | $ | 862,381 |  |  | 11.5051 | % |  | $ | 337,304 |  |  | 4.5 | % |  | $ | 487,217 |  |  | 6.5 | %
Tier 1 Capital (to risk-weighted assets): |  |  |  |  |  |  |  |  |  |  |  |
The Company |  | $ | 874,688 |  |  | 11.6646 | % |  | $ | 449,919 |  |  | 6.0 | % |  | N/A |  |  | N/A |
Columbia Bank |  | $ | 862,381 |  |  | 11.5051 | % |  | $ | 449,739 |  |  | 6.0 | % |  | $ | 599,652 |  |  | 8.0 | %
Total Capital (to risk-weighted assets): |  |  |  |  |  |  |  |  |  |  |  |
The Company |  | $ | 947,436 |  |  | 12.6347 | % |  | $ | 599,892 |  |  | 8.0 | % |  | N/A |  |  | N/A |
Columbia Bank |  | $ | 935,129 |  |  | 12.4756 | % |  | $ | 599,652 |  |  | 8.0 | % |  | $ | 749,565 |  |  | 10.0 | %
Tier 1 Capital Leverage (to average assets): |  |  |  |  |  |  |  |  |  |  |  |
The Company |  | $ | 874,688 |  |  | 9.5526 | % |  | $ | 366,263 |  |  | 4.0 | % |  | N/A |  |  | N/A |
Columbia Bank |  | $ | 862,381 |  |  | 9.4275 | % |  | $ | 365,902 |  |  | 4.0 | % |  | $ | 457,378 |  |  | 5.0 | %
As of December 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |
CET1 Capital (to risk-weighted assets): |  |  |  |  |  |  |  |  |  |  |  |
The Company |  | 852,731 |  |  | 11.94 | % |  | 321,370 |  |  | 4.5 | % |  | N/A |  |  | N/A |
Columbia Bank |  | 839,127 |  |  | 11.76 | % |  | 321,168 |  |  | 4.5 | % |  | 463,909 |  |  | 6.5 | %
Tier 1 Capital (to risk-weighted assets): |  |  |  |  |  |  |  |  |  |  |  |
The Company |  | $ | 853,182 |  |  | 11.95 | % |  | $ | 428,493 |  |  | 6.0 | % |  | N/A |  |  | N/A |
Columbia Bank |  | $ | 839,127 |  |  | 11.76 | % |  | $ | 428,223 |  |  | 6.0 | % |  | $ | 570,965 |  |  | 8.0 | %
Total Capital (to risk-weighted assets): |  |  |  |  |  |  |  |  |  |  |  |
The Company |  | $ | 924,284 |  |  | 12.94 | % |  | $ | 571,324 |  |  | 8.0 | % |  | N/A |  |  | N/A |
Columbia Bank |  | $ | 910,229 |  |  | 12.75 | % |  | $ | 570,965 |  |  | 8.0 | % |  | $ | 713,706 |  |  | 10.0 | %
Tier 1 Capital Leverage (to average assets): |  |  |  |  |  |  |  |  |  |  |  |
The Company |  | $ | 853,182 |  |  | 10.03 | % |  | $ | 340,420 |  |  | 4.0 | % |  | N/A |  |  | N/A |
Columbia Bank |  | $ | 839,127 |  |  | 9.89 | % |  | $ | 339,405 |  |  | 4.0 | % |  | $ | 424,256 |  |  | 5.0 | %

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- Definition Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1G -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958577-112826 + Details
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