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Regulatory Matters - Regulatory Capital Amounts and Ratios for Company and Bank (Detail) $ in Thousands | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
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Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Ratio | 0.8 |
Total Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Ratio | 1 |
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Ratio | 0.6 |
Tier 1 Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Ratio | 0.8 |
Tier 1 Capital (to Average-Assets), For Capital Adequacy Purposes, Ratio | 0.4 |
Tier 1 Capital (to Average-Assets), Required To Be Well Capitalized, Ratio | 0.5 |
Parent Company [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital (to Risk-Weighted Assets), Actual, Amount | $ 1,814,244 | $ 1,720,968
Total Capital (to Risk-Weighted Assets), Actual, Ratio | 0.1706 | 0.155
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount | $ 1,116,868 | $ 1,166,038
Tier 1 Capital (to Risk-Weighted Assets), Actual, Amount | $ 1,727,872 | $ 1,626,626
Tier 1 Capital (to Risk-Weighted Assets), Actual, Ratio | 0.1624 | 0.1465
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount | $ 904,131 | $ 943,936
Common equity Tier I capital ratio, Actual, Amount | $ 1,727,872 | $ 1,626,626
Common equity Tier I capital ratio, Actual, Ratio | 0.1624 | 0.1465
Common equity Tier I capital ratio, For Capital Adequacy Purposes, Amount | $ 744,579 | $ 777,359
Tier 1 Capital (to Average-Assets), Actual, Amount | $ 1,727,872 | $ 1,626,626
Tier 1 Capital (to Average-Assets), Actual, Ratio | 0.1146 | 0.1027
Tier 1 Capital (to Average-Assets), For Capital Adequacy Purposes, Amount | $ 603,247 | $ 633,372
Bank [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital (to Risk-Weighted Assets), Actual, Amount | $ 1,790,805 | $ 1,704,856
Total Capital (to Risk-Weighted Assets), Actual, Ratio | 0.1682 | 0.1534
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount | $ 1,117,602 | $ 1,166,673
Total Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Amount | 1,064,383 | 1,111,118
Tier 1 Capital (to Risk-Weighted Assets), Actual, Amount | $ 1,704,433 | $ 1,610,514
Tier 1 Capital (to Risk-Weighted Assets), Actual, Ratio | 0.1601 | 0.1449
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount | $ 904,726 | $ 944,450
Tier 1 Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Amount | 851,507 | 888,894
Common equity Tier I capital ratio, Actual, Amount | $ 1,704,433 | $ 1,610,514
Common equity Tier I capital ratio, Actual, Ratio | 0.1601 | 0.1449
Common equity Tier I capital ratio, For Capital Adequacy Purposes, Amount | $ 745,068 | $ 777,782
Common equity Tier I capital ratio, To Be Well Capitalized under Prompt Corrective Action Provisions, Amount | 691,849 | 722,226
Tier 1 Capital (to Average-Assets), Actual, Amount | $ 1,704,433 | $ 1,610,514
Tier 1 Capital (to Average-Assets), Actual, Ratio | 0.113 | 0.1017
Tier 1 Capital (to Average-Assets), For Capital Adequacy Purposes, Amount | $ 603,506 | $ 633,582
Tier 1 Capital (to Average-Assets), Required To Be Well Capitalized, Amount | $ 754,382 | $ 791,978
Minimum [Member] | Parent Company [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Ratio | 0.105 | 0.105
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Ratio | 0.085 | 0.085
Common equity Tier I capital ratio, For Capital Adequacy Purposes, Ratio | 7.00% | 7.00%
Tier 1 Capital (to Average-Assets), For Capital Adequacy Purposes, Ratio | 0.04 | 0.04
Minimum [Member] | Bank [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Ratio | 0.105 | 0.105
Total Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Ratio | 0.10 | 0.10
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Ratio | 0.85 | 0.85
Tier 1 Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Ratio | 0.08 | 0.08
Common equity Tier I capital ratio, For Capital Adequacy Purposes, Ratio | 7.00% | 7.00%
Common equity Tier I capital ratio, To Be Well Capitalized under Prompt Corrective Action Provisions, Ratio | 6.50% | 6.50%
Tier 1 Capital (to Average-Assets), For Capital Adequacy Purposes, Ratio | 0.04 | 0.04
Tier 1 Capital (to Average-Assets), Required To Be Well Capitalized, Ratio | 0.05 | 0.05

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