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Regulatory Matters - Regulatory Capital Amounts and Ratios for Company and Bank (Detail) $ in Thousands | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
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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 | $ 1,720,968 | $ 1,618,279
Total Capital (to Risk-Weighted Assets), Actual, Ratio | 0.155 | 0.1437
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount | $ 1,166,038 | $ 1,182,276
Tier 1 Capital (to Risk-Weighted Assets), Actual, Amount | $ 1,626,626 | $ 1,525,162
Tier 1 Capital (to Risk-Weighted Assets), Actual, Ratio | 0.1465 | 0.1355
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount | $ 943,936 | $ 957,080
Common equity Tier I capital ratio, Actual, Amount | $ 1,626,626 | $ 1,525,162
Common equity Tier I capital ratio, Actual, Ratio | 0.1465 | 0.1355
Common equity Tier I capital ratio, For Capital Adequacy Purposes, Amount | $ 777,359 | $ 788,184
Tier 1 Capital (to Average-Assets), Actual, Amount | $ 1,626,626 | $ 1,525,162
Tier 1 Capital (to Average-Assets), Actual, Ratio | 0.1027 | 0.0953
Tier 1 Capital (to Average-Assets), For Capital Adequacy Purposes, Amount | $ 633,372 | $ 639,881
Bank [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital (to Risk-Weighted Assets), Actual, Amount | $ 1,704,856 | $ 1,600,463
Total Capital (to Risk-Weighted Assets), Actual, Ratio | 0.1534 | 0.1422
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount | $ 1,166,673 | $ 1,182,055
Total Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Amount | 1,111,118 | 1,125,767
Tier 1 Capital (to Risk-Weighted Assets), Actual, Amount | $ 1,610,514 | $ 1,507,346
Tier 1 Capital (to Risk-Weighted Assets), Actual, Ratio | 0.1449 | 0.1339
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount | $ 944,450 | $ 956,902
Tier 1 Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Amount | 888,894 | 900,614
Common equity Tier I capital ratio, Actual, Amount | $ 1,610,514 | $ 1,507,346
Common equity Tier I capital ratio, Actual, Ratio | 0.1449 | 0.1339
Common equity Tier I capital ratio, For Capital Adequacy Purposes, Amount | $ 777,782 | $ 788,037
Common equity Tier I capital ratio, To Be Well Capitalized under Prompt Corrective Action Provisions, Amount | 722,226 | 731,748
Tier 1 Capital (to Average-Assets), Actual, Amount | $ 1,610,514 | $ 1,507,346
Tier 1 Capital (to Average-Assets), Actual, Ratio | 0.1017 | 0.0942
Tier 1 Capital (to Average-Assets), For Capital Adequacy Purposes, Amount | $ 633,582 | $ 639,816
Tier 1 Capital (to Average-Assets), Required To Be Well Capitalized, Amount | $ 791,978 | $ 799,769
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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