Regulations and Supervision - Actual Capital Amounts and Ratios (Details) $ in Thousands	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Banking Regulation, Total Capital [Abstract]
Total Capital (to risk-weighted assets), Actual Amount	$ 754,792	$ 780,472
Total Capital (to risk-weighted assets), Actual Ratio	0.134	0.144
Total Capital (to risk-weighted assets), Minimum Capital Required, Amount	$ 593,213	$ 568,431
Total Capital (to risk-weighted assets), Minimum Capital Required, Ratio	0.105	0.105
Total Capital (to risk-weighted assets), Required to be Well Capitalized, Amount	$ 564,965	$ 541,363
Total Capital (to risk-weighted assets), Required to be Well Capitalized, Ratio	0.100	0.100
Common Equity Tier 1 Capital (To Risk-weighted Assets)
Common Equity Tier 1 Capital (to risk-weighted assets), Actual Amount	$ 699,525	$ 730,330
Common Equity Tier 1 Capital (to risk-weighted assets), Actual Ratio	0.124	0.135
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum Capital Required, Amount	$ 395,476	$ 378,954
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum Capital Required, Ratio	7.00%	7.00%
Common Equity Tier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Amount	$ 367,227	$ 351,886
Common Equity Tier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Ratio	6.50%	6.50%
Tier 1 Capital (To Risk-weighted Assets)
Tier 1 Capital (to risk-weighted assets), Actual Amount	$ 699,525	$ 730,330
Tier 1 Capital (to risk-weighted assets), Actual Ratio	0.124	0.135
Tier 1 Capital (to risk-weighted assets), Minimum Capital Required, Amount	$ 480,220	$ 460,159
Tier 1 Capital (to risk-weighted assets), Minimum Capital Required, Ratio	0.085	0.085
Tier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Amount	$ 451,972	$ 433,091
Tier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Ratio	0.080	0.080
Tier 1 Leverage Capital (To Average Assets)
Tier 1 Capital (to average assets), Actual Amount	$ 699,525	$ 730,330
Tier 1 Capital (to average assets), Actual Ratio	0.091	0.093
Tier 1 Capital (to average assets), Minimum Capital Required, Amount	$ 308,269	$ 312,695
Tier 1 Capital (to average assets), Minimum Capital Required, Ratio	0.040	0.040
Tier 1 Capital (to average assets), Required to be Well Capitalized, Amount	$ 385,337	$ 390,868
Tier 1 Capital (to average assets), Required to be Well Capitalized, Ratio	0.050	0.050
Subsidiaries
Banking Regulation, Total Capital [Abstract]
Total Capital (to risk-weighted assets), Actual Amount	$ 721,297	$ 736,099
Total Capital (to risk-weighted assets), Actual Ratio	0.128	0.136
Total Capital (to risk-weighted assets), Minimum Capital Required, Amount	$ 591,445	$ 567,793
Total Capital (to risk-weighted assets), Minimum Capital Required, Ratio	0.105	0.105
Total Capital (to risk-weighted assets), Required to be Well Capitalized, Amount	$ 563,281	$ 540,755
Total Capital (to risk-weighted assets), Required to be Well Capitalized, Ratio	0.100	0.100
Common Equity Tier 1 Capital (To Risk-weighted Assets)
Common Equity Tier 1 Capital (to risk-weighted assets), Actual Amount	$ 666,030	$ 685,956
Common Equity Tier 1 Capital (to risk-weighted assets), Actual Ratio	0.118	0.127
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum Capital Required, Amount	$ 394,297	$ 378,529
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum Capital Required, Ratio	7.00%	7.00%
Common Equity Tier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Amount	$ 366,133	$ 351,491
Common Equity Tier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Ratio	6.50%	6.50%
Tier 1 Capital (To Risk-weighted Assets)
Tier 1 Capital (to risk-weighted assets), Actual Amount	$ 666,030	$ 685,956
Tier 1 Capital (to risk-weighted assets), Actual Ratio	0.118	0.127
Tier 1 Capital (to risk-weighted assets), Minimum Capital Required, Amount	$ 478,789	$ 459,642
Tier 1 Capital (to risk-weighted assets), Minimum Capital Required, Ratio	0.085	0.085
Tier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Amount	$ 450,625	$ 432,604
Tier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Ratio	0.080	0.080
Tier 1 Leverage Capital (To Average Assets)
Tier 1 Capital (to average assets), Actual Amount	$ 666,030	$ 685,956
Tier 1 Capital (to average assets), Actual Ratio	0.087	0.088
Tier 1 Capital (to average assets), Minimum Capital Required, Amount	$ 307,956	$ 312,057
Tier 1 Capital (to average assets), Minimum Capital Required, Ratio	0.040	0.040
Tier 1 Capital (to average assets), Required to be Well Capitalized, Amount	$ 384,945	$ 390,071
Tier 1 Capital (to average assets), Required to be Well Capitalized, Ratio	0.050	0.050

Banking Regulation, Tier 1 Risk-Based Capital, Capital Adequacy, With Buffer, Minimum

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Amount of minimum total risk-based capital required for capital adequacy as defined by regulatory framework.

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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//1943274/2147480696/942-505-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480696/942-505-50-1B

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