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Allowance for Credit Losses - Effect of Loan Modification (Detail) | 3 Months Ended | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Payment Delay / Term Extension | Multifamily |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Weighted average increase term |  |  |  | 12 months
Payment Delay / Term Extension | CRE non-owner occupied |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Weighted average increase term | 36 months |  | 36 months | 120 months
Payment Delay / Term Extension | SFR HELOCs and junior liens |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Weighted average increase term |  |  |  | 60 months
Payment Delay / Term Extension | Commercial and industrial |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Weighted average increase term |  |  |  | 53 months
Combination - Term Extension/Rate Change | Commercial and industrial |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Weighted average increase term |  | 60 months |  |

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