Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2025

Equity [Abstract]

Public Utilities General Disclosures

The following tables presents the Company's and the Columbia Bank's actual capital amounts and ratios at December 31, 2025 and 2024 compared to the Federal Reserve Bank minimum capital adequacy requirements and the Federal Reserve Bank requirements for classification as a well-capitalized institution:

(13)    Stockholders' Equity (continued)

Regulatory Capital (continued)

	Actual				Minimum Capital Adequacy Requirements				Minimum Capital Adequacy Requirements With Capital Conservation Buffer				To Be Well Capitalized Under Prompt Corrective Action Provisions
	Amount		Ratio		Amount		Ratio		Amount		Ratio		Amount		Ratio
Company	(In thousands, except ratio data)
At December 31, 2025:
Total capital (to risk-weighted assets)	$	1,196,057	14.92	%	$	641,506	8.00	%	$	841,976	10.50	%	N/A		N/A
Tier 1 capital (to risk-weighted assets)	1,125,002		14.03		481,129		6.00		681,600		8.50		N/A		N/A
Common equity tier 1 capital (to risk-weighted assets)	1,117,785		13.94		360,847		4.50		561,317		7.00		N/A		N/A
Tier 1 capital (to adjusted total assets)	1,125,002		10.27		438,061		4.00		438,061		4.00		N/A		N/A
At December 31, 2024:
Total capital (to risk-weighted assets)	$	1,131,159	14.20	%	$	637,077	8.00	%	$	836,164	10.50	%	N/A		N/A
Tier 1 capital (to risk-weighted assets)	1,067,445		13.40		477,808		6.00		676,895		8.50		N/A		N/A
Common equity tier 1 capital (to risk-weighted assets)	1,060,228		13.31		358,356		4.50		557,443		7.00		N/A		N/A
Tier 1 capital (to adjusted total assets)	1,067,445		10.02		426,319		4.00		426,319		4.00		N/A		N/A
Columbia Bank
At December 31, 2025:
Total capital (to risk-weighted assets)	$	1,129,574	14.09	%	$	641,534	8.00	%	$	842,014	10.50	%	$	801,918	10.00	%
Tier 1 capital (to risk-weighted assets)	1,058,519		13.20		481,151		6.00		681,630		8.50		641,534		8.00
Common equity tier 1 capital (to risk-weighted assets)	1,058,519		13.20		360,863		4.50		561,342		7.00		521,247		6.50
Tier 1 capital (to adjusted total assets)	1,058,519		9.67		438,029		4.00		438,029		4.00		547,536		5.00
At December 31, 2024:
Total capital (to risk-weighted assets)	$	1,090,717	14.41	%	$	605,734	8.00	%	$	795,025	10.50	%	$	757,167	10.00	%
Tier 1 capital (to risk-weighted assets)	1,027,003		13.56		454,300		6.00		643,592		8.50		605,734		8.00
Common equity tier 1 capital (to risk-weighted assets)	1,027,003		13.56		340,725		4.50		530,017		7.00		492,159		6.50
Tier 1 capital (to adjusted total assets)	1,027,003		9.64		425,935		4.00		425,935		4.00		532,419		5.00