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Regulatory Capital Requirements (Tables) | 12 Months Ended
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Dec. 31, 2019
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract] |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations | As of December 31, 2019, the most recent notification from the FDIC 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, 2019 and 2018 are presented in the following table:
|  | Actual |  | Minimum Required For Capital Adequacy Purposes |  | Minimum Required Plus Capital Conservation Buffer Phase-In |  | Minimum Required Plus Capital Conservation Buffer Fully Phased-In |  | To Be Well Capitalized Under Prompt Corrective Action Provision
Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio
|  | (dollars in thousands)
December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CET1 Capital (to risk-weighted assets): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The Company |  | $ | 1,317,202 |  |  | 12.45 | % |  | $ | 476,260 |  |  | 4.50 | % |  | N/A |  |  | N/A |  |  | $ | 740,849 |  |  | 7.00 | % |  | N/A |  |  | N/A |
Columbia Bank |  | $ | 1,318,044 |  |  | 12.46 | % |  | $ | 475,913 |  |  | 4.50 | % |  | N/A |  |  | N/A |  |  | $ | 740,310 |  |  | 7.00 | % |  | $ | 687,430 |  |  | 6.50 | %
Tier 1 Capital (to risk-weighted assets): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The Company |  | $ | 1,317,202 |  |  | 12.45 | % |  | $ | 635,014 |  |  | 6.00 | % |  | N/A |  |  | N/A |  |  | $ | 899,603 |  |  | 8.50 | % |  | N/A |  |  | N/A |
Columbia Bank |  | $ | 1,318,044 |  |  | 12.46 | % |  | $ | 634,551 |  |  | 6.00 | % |  | N/A |  |  | N/A |  |  | $ | 898,947 |  |  | 8.50 | % |  | $ | 846,068 |  |  | 8.00 | %
Total Capital (to risk-weighted assets): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The Company |  | $ | 1,439,877 |  |  | 13.60 | % |  | $ | 846,685 |  |  | 8.00 | % |  | N/A |  |  | N/A |  |  | $ | 1,111,274 |  |  | 10.50 | % |  | N/A |  |  | N/A |
Columbia Bank |  | $ | 1,405,422 |  |  | 13.29 | % |  | $ | 846,068 |  |  | 8.00 | % |  | N/A |  |  | N/A |  |  | $ | 1,110,464 |  |  | 10.50 | % |  | $ | 1,057,585 |  |  | 10.00 | %
Tier 1 Capital Leverage (to average assets): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The Company |  | $ | 1,317,202 |  |  | 10.17 | % |  | $ | 517,938 |  |  | 4.00 | % |  | N/A |  |  | N/A |  |  | $ | 517,938 |  |  | 4.00 | % |  | N/A |  |  | N/A |
Columbia Bank |  | $ | 1,318,044 |  |  | 10.22 | % |  | $ | 515,797 |  |  | 4.00 | % |  | N/A |  |  | N/A |  |  | $ | 515,797 |  |  | 4.00 | % |  | $ | 644,746 |  |  | 5.00 | %
December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CET1 Capital (to risk-weighted assets): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The Company |  | $ | 1,253,394 |  |  | 12.74 | % |  | $ | 442,717 |  |  | 4.50 | % |  | $ | 627,182 |  |  | 6.38 | % |  | $ | 688,670 |  |  | 7.00 | % |  | N/A |  |  | N/A |
Columbia Bank |  | $ | 1,274,317 |  |  | 12.96 | % |  | $ | 442,552 |  |  | 4.50 | % |  | $ | 626,948 |  |  | 6.38 | % |  | $ | 688,414 |  |  | 7.00 | % |  | $ | 639,241 |  |  | 6.50 | %
Tier 1 Capital (to risk-weighted assets): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The Company |  | $ | 1,253,394 |  |  | 12.74 | % |  | $ | 590,289 |  |  | 6.00 | % |  | $ | 774,754 |  |  | 7.88 | % |  | $ | 836,243 |  |  | 8.50 | % |  | N/A |  |  | N/A |
Columbia Bank |  | $ | 1,274,317 |  |  | 12.96 | % |  | $ | 590,069 |  |  | 6.00 | % |  | $ | 774,465 |  |  | 7.88 | % |  | $ | 835,931 |  |  | 8.50 | % |  | $ | 786,759 |  |  | 8.00 | %
Total Capital (to risk-weighted assets): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The Company |  | $ | 1,376,555 |  |  | 13.99 | % |  | $ | 787,052 |  |  | 8.00 | % |  | $ | 971,517 |  |  | 9.88 | % |  | $ | 1,033,006 |  |  | 10.50 | % |  | N/A |  |  | N/A |
Columbia Bank |  | $ | 1,362,016 |  |  | 13.85 | % |  | $ | 786,759 |  |  | 8.00 | % |  | $ | 971,155 |  |  | 9.88 | % |  | $ | 1,032,621 |  |  | 10.50 | % |  | $ | 983,448 |  |  | 10.00 | %
Tier 1 Capital Leverage (to average assets): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The Company |  | $ | 1,253,394 |  |  | 10.24 | % |  | $ | 489,399 |  |  | 4.00 | % |  | $ | 489,399 |  |  | 4.00 | % |  | $ | 489,399 |  |  | 4.00 | % |  | N/A |  |  | N/A |
Columbia Bank |  | $ | 1,274,317 |  |  | 10.42 | % |  | $ | 489,254 |  |  | 4.00 | % |  | $ | 489,254 |  |  | 4.00 | % |  | $ | 489,254 |  |  | 4.00 | % |  | $ | 611,567 |  |  | 5.00 | %

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