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Regulatory Matters - Regulatory Capital Amounts and Ratios for Company and Bank (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Parent Company [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital (to Risk-Weighted Assets), Actual, Amount | $ 1,391,771 | $ 1,263,800
Total Capital (to Risk-Weighted Assets), Actual, Ratio | 16.01% | 14.13%
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount | $ 695,651 | $ 715,283
Tier 1 Capital (to Risk-Weighted Assets), Actual, Amount | $ 1,314,152 | $ 1,191,228
Tier 1 Capital (to Risk-Weighted Assets), Actual, Ratio | 15.11% | 13.32%
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount | $ 521,738 | $ 536,462
Common equity Tier I capital ratio, Actual, Amount | $ 1,289,152 | $ 1,166,228
Common equity Tier I capital ratio, Actual, Ratio | 14.83% | 13.04%
Common equity Tier I capital ratio, For Capital Adequacy Purposes, Amount | $ 391,304 | $ 402,347
Tier 1 Capital (to Average-Assets), Actual, Amount | $ 1,314,152 | $ 1,191,228
Tier 1 Capital (to Average-Assets), Actual, Ratio | 12.33% | 10.98%
Tier 1 Capital (to Average-Assets), For Capital Adequacy Purposes, Amount | $ 426,497 | $ 433,834
Bank [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital (to Risk-Weighted Assets), Actual, Amount | $ 1,376,364 | $ 1,253,219
Total Capital (to Risk-Weighted Assets), Actual, Ratio | 15.83% | 14.03%
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount | $ 695,471 | $ 714,601
Total Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Amount | 869,339 | 893,251
Tier 1 Capital (to Risk-Weighted Assets), Actual, Amount | $ 1,298,745 | $ 1,180,647
Tier 1 Capital (to Risk-Weighted Assets), Actual, Ratio | 14.94% | 13.22%
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount | $ 521,604 | $ 535,951
Tier 1 Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Amount | 695,471 | 714,601
Common equity Tier I capital ratio, Actual, Amount | $ 1,298,745 | $ 1,180,647
Common equity Tier I capital ratio, Actual, Ratio | 14.94% | 13.22%
Common equity Tier I capital ratio, For Capital Adequacy Purposes, Amount | $ 391,203 | $ 401,963
Common equity Tier I capital ratio, To Be Well Capitalized under Prompt Corrective Action Provisions, Amount | 565,070 | 580,613
Tier 1 Capital (to Average-Assets), Actual, Amount | $ 1,298,745 | $ 1,180,647
Tier 1 Capital (to Average-Assets), Actual, Ratio | 12.19% | 10.90%
Tier 1 Capital (to Average-Assets), For Capital Adequacy Purposes, Amount | $ 426,328 | $ 433,403
Tier 1 Capital (to Average-Assets), Required To Be Well Capitalized, Amount | $ 532,909 | $ 541,754
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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