Regulatory Matters - Regulatory Capital Amounts and Ratios for Company and Bank (Detail) $ in Thousands	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
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	$ 1,814,244	$ 1,720,968
Total Capital (to Risk-Weighted Assets), Actual, Ratio	0.1706	0.155
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount	$ 1,116,868	$ 1,166,038
Tier 1 Capital (to Risk-Weighted Assets), Actual, Amount	$ 1,727,872	$ 1,626,626
Tier 1 Capital (to Risk-Weighted Assets), Actual, Ratio	0.1624	0.1465
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount	$ 904,131	$ 943,936
Common equity Tier I capital ratio, Actual, Amount	$ 1,727,872	$ 1,626,626
Common equity Tier I capital ratio, Actual, Ratio	0.1624	0.1465
Common equity Tier I capital ratio, For Capital Adequacy Purposes, Amount	$ 744,579	$ 777,359
Tier 1 Capital (to Average-Assets), Actual, Amount	$ 1,727,872	$ 1,626,626
Tier 1 Capital (to Average-Assets), Actual, Ratio	0.1146	0.1027
Tier 1 Capital (to Average-Assets), For Capital Adequacy Purposes, Amount	$ 603,247	$ 633,372
Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital (to Risk-Weighted Assets), Actual, Amount	$ 1,790,805	$ 1,704,856
Total Capital (to Risk-Weighted Assets), Actual, Ratio	0.1682	0.1534
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount	$ 1,117,602	$ 1,166,673
Total Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Amount	1,064,383	1,111,118
Tier 1 Capital (to Risk-Weighted Assets), Actual, Amount	$ 1,704,433	$ 1,610,514
Tier 1 Capital (to Risk-Weighted Assets), Actual, Ratio	0.1601	0.1449
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount	$ 904,726	$ 944,450
Tier 1 Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Amount	851,507	888,894
Common equity Tier I capital ratio, Actual, Amount	$ 1,704,433	$ 1,610,514
Common equity Tier I capital ratio, Actual, Ratio	0.1601	0.1449
Common equity Tier I capital ratio, For Capital Adequacy Purposes, Amount	$ 745,068	$ 777,782
Common equity Tier I capital ratio, To Be Well Capitalized under Prompt Corrective Action Provisions, Amount	691,849	722,226
Tier 1 Capital (to Average-Assets), Actual, Amount	$ 1,704,433	$ 1,610,514
Tier 1 Capital (to Average-Assets), Actual, Ratio	0.113	0.1017
Tier 1 Capital (to Average-Assets), For Capital Adequacy Purposes, Amount	$ 603,506	$ 633,582
Tier 1 Capital (to Average-Assets), Required To Be Well Capitalized, Amount	$ 754,382	$ 791,978
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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-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477270/942-505-50-1

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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
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477270/942-505-50-1B

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

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