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Regulatory Matters (Detail) $ in Millions |  | 9 Months Ended
--- | --- | ---
Mar. 27, 2020 | Sep. 30, 2024 USD ($)
Regulatory Matters [Line Items] |  |
Percentage of retained earnings plus current year earnings to be paid as maximum dividend |  | 75.00%
Requested dividend by the company from its subsidiary |  | $ 232.4
Basel III | Criteria 1 |  |
Regulatory Matters [Line Items] |  |
Tier 1 risk-based capital ratio |  | 0.045
Tier 1 leverage capital ratio |  | 0.04
Risk-based capital ratio |  | 0.06
Risk-based capital ratio |  | 0.08
Basel III | Criteria 2 |  |
Regulatory Matters [Line Items] |  |
Risk-based capital ratio |  | 0.1828
Common equity Tier 1 risk-based capital ratio |  | 0.065
Tier 1 leverage capital ratio |  | 0.05
Tier 1 risk-based capital ratio |  | 0.08
Total risk-based capital ratio |  | 0.10
Common equity Tier 1 risk-based capital ratio |  | 0.1465
Tier 1 leverage capital ratio |  | 0.1254
Tier 1 risk-based capital ratio |  | 0.1465
CECL | COVID -19 |  |
Regulatory Matters [Line Items] |  |
Allowable percentage of bank holding companies impact | 100.00% |
Percentage of allowance for credit losses | 25.00% |

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