Regulatory Capital Requirements - Capital Amounts and Ratios (Details) $ in Thousands	Mar. 31, 2026 USD ($)	Dec. 31, 2025 USD ($)
Amount
Common Tier 1 Capital, amount	$ 525,849	$ 510,729
Tier 1 Capital, amount	556,096	540,897
Total Capital, amount	674,811	660,451
Leverage Exposure, amount	6,098,196	6,129,306
Risk-Weighted Assets, amount	$ 4,794,374	$ 4,852,573
Ratios
Common Equity Tier 1 Capital to Risk-Weighted Assets ("RWA"), ratio	0.1097	0.1052
Tier 1 Capital to RWA, ratio	0.1160	0.1115
Total Capital to RWA, ratio	0.1408	0.1361
Tier 1 Capital to AA (Leverage), ratio	0.0912	0.0882
Regulatory Minimum Ratio + Capital Conservation Buffer, Amount
Common Equity Tier 1 Capital	$ 335,606	$ 339,680
Tier 1 Capital	407,522	412,469
Total Capital	503,409	509,520
Leverage Exposure	$ 243,928	$ 245,172
Regulatory Minimum Ratio + Capital Conservation Buffer, Ratios
Common Equity Tier 1 Capital to RWA, ratio	0.0700	0.0700
Tier 1 Capital to RWA, ratio	0.0850	0.0850
Total Capital to RWA, ratio	0.1050	0.1050
Tier 1 Capital to Average Assets (Leverage), ratio	0.0400	0.0400
To Be Well-Capitalized Under PCA, Ratios
Capitalized threshold	5.00%	5.00%
Excess of Tier 1 Capital to RWA over the minimum buffer ratio (as a percent)	0.0560
The Bank
Amount
Common Tier 1 Capital, amount	$ 583,733	$ 569,183
Tier 1 Capital, amount	583,733	569,183
Total Capital, amount	643,627	629,746
Leverage Exposure, amount	6,093,905	6,122,775
Risk-Weighted Assets, amount	$ 4,791,223	$ 4,844,639
Ratios
Common Equity Tier 1 Capital to Risk-Weighted Assets ("RWA"), ratio	0.1218	0.1175
Tier 1 Capital to RWA, ratio	0.1218	0.1175
Total Capital to RWA, ratio	0.1343	0.1300
Tier 1 Capital to AA (Leverage), ratio	0.0958	0.0930
Regulatory Minimum Ratio + Capital Conservation Buffer, Amount
Common Equity Tier 1 Capital	$ 335,386	$ 339,125
Tier 1 Capital	407,254	411,794
Total Capital	503,078	508,687
Leverage Exposure	$ 243,756	$ 244,911
Regulatory Minimum Ratio + Capital Conservation Buffer, Ratios
Common Equity Tier 1 Capital to RWA, ratio	0.0700	0.0700
Tier 1 Capital to RWA, ratio	0.0850	0.0850
Total Capital to RWA, ratio	0.1050	0.1050
Tier 1 Capital to Average Assets (Leverage), ratio	0.0400	0.0400
To Be Well-Capitalized Under PCA Regulation, Amount
Common Equity Tier 1 Capital	$ 311,429	$ 314,902
Tier 1 Capital	383,298	387,571
Total Capital	479,122	484,464
Leverage Exposure	$ 304,695	$ 306,139
To Be Well-Capitalized Under PCA, Ratios
Common Equity Tier 1 Capital to RWA, ratio	0.0650	0.0650
Tier 1 Capital to RWA, ratio	0.0800	0.0800
Total Capital to RWA, ratio	0.1000	0.1000
Tier 1 Capital to Average Assets (Leverage), ratio	0.0500	0.0500
Excess of Total Capital to RWA over the minimum buffer ratio (as a percent)	0.0543

Banking Regulation, Capital Adequacy, Minimum

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477270/942-505-50-1

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