Regulatory Matters - Regulatory Capital Amounts and Ratios for Company and Bank (Detail) $ in Thousands	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
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

Common equity tier one capital ratio required for capital adequacy.

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Tier One Risk Based Capital Required For Capital Adequacy With Buffer

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Tier One Risk Based Capital Required For Capital Adequacy With Buffer To Risk Weighted Assets

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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
-Topic 942
-SubTopic 505
-Section 50
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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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