Regulatory Matters - Regulatory Capital Amounts and Ratios for Company and Bank (Detail) $ in Thousands	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
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

Common equity tier one capital ratio required for capital adequacy.

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Amount of total capital as defined by regulatory framework.

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