Regulatory Capital Requirements - Additional Information (Detail) $ in Billions	Dec. 31, 2024 USD ($)	Dec. 31, 2023
Regulatory Capital Requirements Under Banking Regulations [Line Items]
Loans or advances from bank limited to percentage of the banks capital stock and surplus and must be secured by collateral	10.00%
Percentage of required capital conservation buffer	0.025
Community bank leverage ratio	0.0949	0.1413
Community Bank Leverage Ratio Requirement [Member]
Regulatory Capital Requirements Under Banking Regulations [Line Items]
Financial institutions minimum amount of assets need to maintain	$ 10
The Economic Growth, Regulatory Relief and Consumer Protection Act of 2018 [Member]
Regulatory Capital Requirements Under Banking Regulations [Line Items]
Financial institutions minimum amount of assets need to maintain	$ 10
Community bank leverage ratio	0.09

Financial institutions, minimum amount of assets required to maintain.

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- Definition

Loans or advances from bank limited to percentage of the banks capital stock and surplus and must be secured by collateral.

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- Definition

Regulatory capital requirements under banking regulations.

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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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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

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- Definition

Ratio of Tier 1 capital to average assets as defined by regulatory framework.

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