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Regulations and Supervision - Actual Capital Amounts and Ratios (Details) $ in Thousands | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
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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

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