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Regulatory Matters - Regulatory Capital Amounts and Ratios for Company and Bank (Detail) $ in Thousands | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
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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 | 8.0 |
Total Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Ratio | 10.0 |
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Ratio | 6.0 |
Tier 1 Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Ratio | 8.0 |
Tier 1 Capital (to Average-Assets), For Capital Adequacy Purposes, Ratio | 4.0 |
Tier 1 Capital (to Average-Assets), Required To Be Well Capitalized, Ratio | 5.0 |
Parent Company [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital (to Risk-Weighted Assets), Actual, Amount | $ 1,415,008 | $ 1,391,771
Total Capital (to Risk-Weighted Assets), Actual, Ratio | 16.24 | 16.01
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount | $ 697,258 | $ 695,651
Tier 1 Capital (to Risk-Weighted Assets), Actual, Amount | $ 1,312,316 | $ 1,314,152
Tier 1 Capital (to Risk-Weighted Assets), Actual, Ratio | 15.06 | 15.11
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount | $ 522,944 | $ 521,738
Common equity Tier I capital ratio, Actual, Amount | $ 1,287,316 | $ 1,289,152
Common equity Tier I capital ratio, Actual, Ratio | 14.77 | 14.83
Common equity Tier I capital ratio, For Capital Adequacy Purposes, Amount | $ 392,208 | $ 391,304
Tier 1 Capital (to Average-Assets), Actual, Amount | $ 1,312,316 | $ 1,314,152
Tier 1 Capital (to Average-Assets), Actual, Ratio | 9.90 | 12.33
Tier 1 Capital (to Average-Assets), For Capital Adequacy Purposes, Amount | $ 530,424 | $ 426,497
Bank [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital (to Risk-Weighted Assets), Actual, Amount | $ 1,372,184 | $ 1,376,364
Total Capital (to Risk-Weighted Assets), Actual, Ratio | 15.75 | 15.83
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount | $ 696,849 | $ 695,471
Total Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Amount | 871,061 | 869,339
Tier 1 Capital (to Risk-Weighted Assets), Actual, Amount | $ 1,269,492 | $ 1,298,745
Tier 1 Capital (to Risk-Weighted Assets), Actual, Ratio | 14.57 | 14.94
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount | $ 522,636 | $ 521,604
Tier 1 Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Amount | 696,849 | 695,471
Common equity Tier I capital ratio, Actual, Amount | $ 1,269,492 | $ 1,298,745
Common equity Tier I capital ratio, Actual, Ratio | 14.57 | 14.94
Common equity Tier I capital ratio, For Capital Adequacy Purposes, Amount | $ 391,977 | $ 391,203
Common equity Tier I capital ratio, To Be Well Capitalized under Prompt Corrective Action Provisions, Amount | 566,189 | 565,070
Tier 1 Capital (to Average-Assets), Actual, Amount | $ 1,269,492 | $ 1,298,745
Tier 1 Capital (to Average-Assets), Actual, Ratio | 9.58 | 12.19
Tier 1 Capital (to Average-Assets), For Capital Adequacy Purposes, Amount | $ 530,164 | $ 426,328
Tier 1 Capital (to Average-Assets), Required To Be Well Capitalized, Amount | $ 662,705 | $ 532,909
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 | 8.00 | 8.00
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Ratio | 6.00 | 6.00
Common equity Tier I capital ratio, For Capital Adequacy Purposes, Ratio | 4.50% | 4.50%
Tier 1 Capital (to Average-Assets), For Capital Adequacy Purposes, Ratio | 4.00 | 4.00
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 | 8.00 | 8.00
Total Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Ratio | 10.00 | 10.00
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Ratio | 6.00 | 6.00
Tier 1 Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Ratio | 8.00 | 8.00
Common equity Tier I capital ratio, For Capital Adequacy Purposes, Ratio | 4.50% | 4.50%
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 | 4.00 | 4.00
Tier 1 Capital (to Average-Assets), Required To Be Well Capitalized, Ratio | 5.00 | 5.00

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