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Regulatory Capital Requirements - Additional Information (Detail) $ in Billions | Jun. 30, 2025 USD ($) | Dec. 31, 2024
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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 | 0.1034 | 0.0949
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 |

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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. + References No definition available. + Details
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- Definition Regulatory capital requirements under banking regulations. + References No definition available. + Details
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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. + 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 + Details
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- Definition Ratio of Tier 1 capital to average assets 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 + Details
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