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Regulatory Capital Requirements (Tables)
 12 Months Ended
Dec. 31, 2017
Regulatory Capital Requirements [Abstract]  
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations
As of December 31, 2017, 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, 2017 and 2016 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)
As of December 31, 2017
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
CET1 Capital (to risk-weighted assets):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
The Company
 
$
1,158,252

 
11.7421
%
 
$
443,886

 
4.50
%
 
$
567,187

 
5.75
%
 
$
690,489

 
7.00
%
 
N/A

 
N/A

Columbia Bank
 
$
1,184,476

 
12.0133
%
 
$
443,687

 
4.50
%
 
$
566,933

 
5.75
%
 
$
690,180

 
7.00
%
 
$
640,881

 
6.50
%
Tier 1 Capital (to risk-weighted assets):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
The Company
 
$
1,165,903

 
11.8196
%
 
$
591,848

 
6.00
%
 
$
715,149

 
7.25
%
 
$
838,451

 
8.50
%
 
N/A

 
N/A

Columbia Bank
 
$
1,184,476

 
12.0133
%
 
$
591,582

 
6.00
%
 
$
714,829

 
7.25
%
 
$
838,075

 
8.50
%
 
$
788,777

 
8.00
%
Total Capital (to risk-weighted assets):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
The Company
 
$
1,280,326

 
12.9796
%
 
$
789,130

 
8.00
%
 
$
912,432

 
9.25
%
 
$
1,035,734

 
10.50
%
 
N/A

 
N/A

Columbia Bank
 
$
1,263,252

 
12.8123
%
 
$
788,777

 
8.00
%
 
$
912,023

 
9.25
%
 
$
1,035,269

 
10.50
%
 
$
985,971

 
10.00
%
Tier 1 Capital Leverage (to average assets):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
The Company
 
$
1,165,903

 
10.9611
%
 
$
425,469

 
4.00
%
 
$
425,469

 
4.00
%
 
$
425,469

 
4.00
%
 
N/A

 
N/A

Columbia Bank
 
$
1,184,476

 
10.8186
%
 
$
437,939

 
4.00
%
 
$
437,939

 
4.00
%
 
$
437,939

 
4.00
%
 
$
547,423

 
5.00
%
As of December 31, 2016
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
CET1 Capital (to risk-weighted assets):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
The Company
 
$
873,217

 
11.6450
%
 
$
337,439

 
4.50
%
 
$
384,306

 
5.125
%
 
$
524,906

 
7.00
%
 
N/A

 
N/A

Columbia Bank
 
$
862,381

 
11.5051
%
 
$
337,304

 
4.50
%
 
$
384,152

 
5.125
%
 
$
524,696

 
7.00
%
 
$
487,217

 
6.50
%
Tier 1 Capital (to risk-weighted assets):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
The Company
 
$
874,688

 
11.6646
%
 
$
449,919

 
6.00
%
 
$
496,786

 
6.625
%
 
$
637,386

 
8.50
%
 
N/A

 
N/A

Columbia Bank
 
$
862,381

 
11.5051
%
 
$
449,739

 
6.00
%
 
$
496,587

 
6.625
%
 
$
637,130

 
8.50
%
 
$
599,652

 
8.00
%
Total Capital (to risk-weighted assets):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
The Company
 
$
947,436

 
12.6347
%
 
$
599,892

 
8.00
%
 
$
646,759

 
8.625
%
 
$
787,359

 
10.50
%
 
N/A

 
N/A

Columbia Bank
 
$
935,129

 
12.4756
%
 
$
599,652

 
8.00
%
 
$
646,500

 
8.625
%
 
$
787,043

 
10.50
%
 
$
749,565

 
10.00
%
Tier 1 Capital Leverage (to average assets):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
The Company
 
$
874,688

 
9.5526
%
 
$
366,263

 
4.00
%
 
$
366,263

 
4.00
%
 
$
366,263

 
4.00
%
 
N/A

 
N/A

Columbia Bank
 
$
862,381

 
9.4275
%
 
$
365,902

 
4.00
%
 
$
365,902

 
4.00
%
 
$
365,902

 
4.00
%
 
$
457,378

 
5.00
%