Regulatory Matters - Regulatory Capital Amounts and Ratios for Company and Bank (Detail) $ in Thousands	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Ratio	0.8
Total Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Ratio	1
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Ratio	0.6
Tier 1 Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Ratio	0.8
Tier 1 Capital (to Average-Assets), For Capital Adequacy Purposes, Ratio	0.4
Tier 1 Capital (to Average-Assets), Required To Be Well Capitalized, Ratio	0.5
Parent Company [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital (to Risk-Weighted Assets), Actual, Amount	$ 1,720,968	$ 1,618,279
Total Capital (to Risk-Weighted Assets), Actual, Ratio	0.155	0.1437
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount	$ 1,166,038	$ 1,182,276
Tier 1 Capital (to Risk-Weighted Assets), Actual, Amount	$ 1,626,626	$ 1,525,162
Tier 1 Capital (to Risk-Weighted Assets), Actual, Ratio	0.1465	0.1355
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount	$ 943,936	$ 957,080
Common equity Tier I capital ratio, Actual, Amount	$ 1,626,626	$ 1,525,162
Common equity Tier I capital ratio, Actual, Ratio	0.1465	0.1355
Common equity Tier I capital ratio, For Capital Adequacy Purposes, Amount	$ 777,359	$ 788,184
Tier 1 Capital (to Average-Assets), Actual, Amount	$ 1,626,626	$ 1,525,162
Tier 1 Capital (to Average-Assets), Actual, Ratio	0.1027	0.0953
Tier 1 Capital (to Average-Assets), For Capital Adequacy Purposes, Amount	$ 633,372	$ 639,881
Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital (to Risk-Weighted Assets), Actual, Amount	$ 1,704,856	$ 1,600,463
Total Capital (to Risk-Weighted Assets), Actual, Ratio	0.1534	0.1422
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount	$ 1,166,673	$ 1,182,055
Total Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Amount	1,111,118	1,125,767
Tier 1 Capital (to Risk-Weighted Assets), Actual, Amount	$ 1,610,514	$ 1,507,346
Tier 1 Capital (to Risk-Weighted Assets), Actual, Ratio	0.1449	0.1339
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount	$ 944,450	$ 956,902
Tier 1 Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Amount	888,894	900,614
Common equity Tier I capital ratio, Actual, Amount	$ 1,610,514	$ 1,507,346
Common equity Tier I capital ratio, Actual, Ratio	0.1449	0.1339
Common equity Tier I capital ratio, For Capital Adequacy Purposes, Amount	$ 777,782	$ 788,037
Common equity Tier I capital ratio, To Be Well Capitalized under Prompt Corrective Action Provisions, Amount	722,226	731,748
Tier 1 Capital (to Average-Assets), Actual, Amount	$ 1,610,514	$ 1,507,346
Tier 1 Capital (to Average-Assets), Actual, Ratio	0.1017	0.0942
Tier 1 Capital (to Average-Assets), For Capital Adequacy Purposes, Amount	$ 633,582	$ 639,816
Tier 1 Capital (to Average-Assets), Required To Be Well Capitalized, Amount	$ 791,978	$ 799,769
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	0.105	0.105
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Ratio	0.085	0.085
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	0.04	0.04
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	0.105	0.105
Total Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Ratio	0.10	0.10
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Ratio	0.85	0.85
Tier 1 Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Ratio	0.08	0.08
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	0.04	0.04
Tier 1 Capital (to Average-Assets), Required To Be Well Capitalized, Ratio	0.05	0.05

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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-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
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Amount of Tier 1 leverage capital as defined by regulatory framework.

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