Regulatory Matters - Regulatory Capital Amounts and Ratios for Company and Bank (Detail) $ in Thousands	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
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	$ 1,479,453	$ 1,415,008
Total Capital (to Risk-Weighted Assets), Actual, Ratio	15.63	16.24
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount	$ 757,166	$ 697,258
Tier 1 Capital (to Risk-Weighted Assets), Actual, Amount	$ 1,406,434	$ 1,312,316
Tier 1 Capital (to Risk-Weighted Assets), Actual, Ratio	14.86	15.06
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount	$ 567,875	$ 522,944
Common equity Tier I capital ratio, Actual, Amount	$ 1,406,434	$ 1,287,316
Common equity Tier I capital ratio, Actual, Ratio	14.86	14.77
Common equity Tier I capital ratio, For Capital Adequacy Purposes, Amount	$ 425,906	$ 392,208
Tier 1 Capital (to Average-Assets), Actual, Amount	$ 1,406,434	$ 1,312,316
Tier 1 Capital (to Average-Assets), Actual, Ratio	9.18	9.90
Tier 1 Capital (to Average-Assets), For Capital Adequacy Purposes, Amount	$ 613,072	$ 530,424
Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital (to Risk-Weighted Assets), Actual, Amount	$ 1,436,988	$ 1,372,184
Total Capital (to Risk-Weighted Assets), Actual, Ratio	15.18	15.75
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount	$ 757,136	$ 696,849
Total Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Amount	946,420	871,061
Tier 1 Capital (to Risk-Weighted Assets), Actual, Amount	$ 1,363,879	$ 1,269,492
Tier 1 Capital (to Risk-Weighted Assets), Actual, Ratio	14.41	14.57
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount	$ 567,852	$ 522,636
Tier 1 Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Amount	757,136	696,849
Common equity Tier I capital ratio, Actual, Amount	$ 1,363,879	$ 1,269,492
Common equity Tier I capital ratio, Actual, Ratio	14.41	14.57
Common equity Tier I capital ratio, For Capital Adequacy Purposes, Amount	$ 425,889	$ 391,977
Common equity Tier I capital ratio, To Be Well Capitalized under Prompt Corrective Action Provisions, Amount	615,173	566,189
Tier 1 Capital (to Average-Assets), Actual, Amount	$ 1,363,879	$ 1,269,492
Tier 1 Capital (to Average-Assets), Actual, Ratio	8.90	9.58
Tier 1 Capital (to Average-Assets), For Capital Adequacy Purposes, Amount	$ 612,983	$ 530,164
Tier 1 Capital (to Average-Assets), Required To Be Well Capitalized, Amount	$ 766,229	$ 662,705
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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Amount of minimum total risk-based capital required for capital adequacy as defined by regulatory framework.

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-Publisher FASB
-Name Accounting Standards Codification
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Amount of minimum total risk-based capital categorized as well capitalized as defined by regulatory framework for prompt corrective action.

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Amount of Common Equity Tier 1 risk-based capital as defined by regulatory framework.

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Amount of Tier 1 leverage capital as defined by regulatory framework.

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