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Regulatory Matters - Regulatory Capital Amounts and Ratios for Company and Bank (Detail) $ in Thousands | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
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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 | 0.80 |
Total Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Ratio | 1.00 |
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Ratio | 0.60 |
Tier 1 Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Ratio | 0.80 |
Tier 1 Capital (to Average-Assets), For Capital Adequacy Purposes, Ratio | 0.40 |
Tier 1 Capital (to Average-Assets), Required To Be Well Capitalized, Ratio | 0.50 |
Parent Company [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital (to Risk-Weighted Assets), Actual, Amount | $ 1,618,279 | $ 1,479,453
Total Capital (to Risk-Weighted Assets), Actual, Ratio | 0.1437 | 0.1563
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount | $ 1,182,276 | $ 993,780
Tier 1 Capital (to Risk-Weighted Assets), Actual, Amount | $ 1,525,162 | $ 1,406,434
Tier 1 Capital (to Risk-Weighted Assets), Actual, Ratio | 0.1355 | 0.1486
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount | $ 957,080 | $ 804,489
Common equity Tier I capital ratio, Actual, Amount | $ 1,525,162 | $ 1,406,434
Common equity Tier I capital ratio, Actual, Ratio | 0.1355 | 0.1486
Common equity Tier I capital ratio, For Capital Adequacy Purposes, Amount | $ 788,184 | $ 662,520
Tier 1 Capital (to Average-Assets), Actual, Amount | $ 1,525,162 | $ 1,406,434
Tier 1 Capital (to Average-Assets), Actual, Ratio | 0.0953 | 0.0918
Tier 1 Capital (to Average-Assets), For Capital Adequacy Purposes, Amount | $ 639,881 | $ 613,072
Bank [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital (to Risk-Weighted Assets), Actual, Amount | $ 1,600,463 | $ 1,436,989
Total Capital (to Risk-Weighted Assets), Actual, Ratio | 0.1422 | 0.1518
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount | $ 1,182,055 | $ 993,741
Total Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Amount | 1,125,767 | 946,420
Tier 1 Capital (to Risk-Weighted Assets), Actual, Amount | $ 1,507,346 | $ 1,363,879
Tier 1 Capital (to Risk-Weighted Assets), Actual, Ratio | 0.1339 | 0.1441
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount | $ 956,902 | $ 804,457
Tier 1 Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Amount | 900,614 | 757,136
Common equity Tier I capital ratio, Actual, Amount | $ 1,507,346 | $ 1,363,879
Common equity Tier I capital ratio, Actual, Ratio | 0.1339 | 0.1441
Common equity Tier I capital ratio, For Capital Adequacy Purposes, Amount | $ 788,037 | $ 662,494
Common equity Tier I capital ratio, To Be Well Capitalized under Prompt Corrective Action Provisions, Amount | 731,748 | 615,173
Tier 1 Capital (to Average-Assets), Actual, Amount | $ 1,507,346 | $ 1,363,879
Tier 1 Capital (to Average-Assets), Actual, Ratio | 0.0942 | 0.0890
Tier 1 Capital (to Average-Assets), For Capital Adequacy Purposes, Amount | $ 639,816 | $ 612,983
Tier 1 Capital (to Average-Assets), Required To Be Well Capitalized, Amount | $ 799,769 | $ 766,229
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 | 0.1050 | 0.1050
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Ratio | 0.0850 | 0.0850
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 | 0.0400 | 0.0400
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 | 0.1050 | 0.1050
Total Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Ratio | 0.1000 | 0.1000
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Ratio | 0.850 | 0.0850
Tier 1 Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Ratio | 0.0800 | 0.0800
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 | 0.0400 | 0.0400
Tier 1 Capital (to Average-Assets), Required To Be Well Capitalized, Ratio | 0.0500 | 0.0500

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