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Allowance for Credit Losses - Effect of Loan Modification (Detail)	3 Months Ended		9 Months Ended
	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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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Period of increase in weighted average maturity of financing receivable modified for debtor experiencing financial difficulty, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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