Regulatory Matters - Additional Information (Detail) $ in Millions	Dec. 31, 2024 USD ($)
Regulated Operations [Abstract]
Additional dividends without obtaining prior approval from bank regulators declared and paid	$ 235.0
Minimum total risk based capital ratio	0.8
Minimum Tier 1 risk based capital ratio	0.6
Minimum common equity Tier 1 capital ratio	0.45
Minimum leverage ratio for Highest rated institutions	0.4
Well capitalized common equity Tier 1 capital ratio	0.65
Well capitalized Tier 1 risk based capital ratio	0.8
Well capitalized risk based capital ratio	1
Well capitalized leverage ratio	0.5
Capital Conservation Buffer rate	0.25
Capital Conservation Buffer common equity Tier 1 capital ratio	0.7
Capital Conservation Buffer Risk-Based Capital Ratio	0.85
Capital Conservation Buffer Total Risk-Based Capital Ratio	0.105
Banking Regulation, Capital Conservation Buffer, Capital Conserved, Minimum	0.25

Additional dividends without obtaining prior approval from bank regulators declared and paid.

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- Definition

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

+ References

No definition available.

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- Definition

Minimum capital conservation buffer percentage required to avoid restriction on payout amount of eligible retained income as defined by regulatory framework.

+ References

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Capital conservation buffer percentage calculated as Common Equity Tier 1 risk-based capital ratio after deduction of minimum Common Equity Tier 1 risk-based capital ratio as defined by regulatory framework.

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Capital conservation buffer percentage calculated as Tier 1 risk-based capital ratio after deduction of minimum Tier 1 risk-based capital ratio as defined by regulatory framework.

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- Definition

Capital conservation buffer percentage calculated as total risk-based capital ratio after deduction of minimum total risk-based capital ratio as defined by regulatory framework.

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- Definition

Ratio of minimum Common Equity Tier 1 risk-based capital to risk-weighted assets required for capital adequacy as defined by regulatory framework.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-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

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-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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Ratio of minimum Common Equity Tier 1 risk-based capital to risk-weighted assets categorized as well capitalized as defined by regulatory framework for prompt corrective action.

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Ratio of minimum total risk-based capital to risk-weighted assets required for capital adequacy as defined by regulatory framework.

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Ratio of minimum total risk-based capital to risk-weighted assets categorized as well capitalized as defined by regulatory framework for prompt corrective action.

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Ratio of minimum Tier 1 leverage capital to average assets required for capital adequacy as defined by regulatory framework.

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Ratio of minimum Tier 1 leverage capital to average assets categorized as well capitalized as defined by regulatory framework for prompt corrective action.

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Ratio of minimum Tier 1 risk-based capital to risk-weighted assets categorized as well capitalized as defined by regulatory framework for prompt corrective action.

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