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Loans Receivable and Allowance for Loan Losses - Loan Modifications (Details) - Commercial business loans $ in Thousands	12 Months Ended
	Sep. 30, 2025 USD ($)
Extended Maturity And Deed Secured
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	$ 256
% of Total Loan Type	0.20%
Weighted average term increase from modification	3 months
Extended Maturity And Monthly Payment Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	$ 1
% of Total Loan Type	0.00%
Weighted average term increase from modification	7 months
Period of payment reduction after signing	1 month 15 days

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- Definition

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- Definition

Amortized cost excluding accrued interest, of financing receivable modified during period for debtor experiencing financial difficulty.

+ References

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-Topic 310
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-Name Accounting Standards Codification
-Section 50
-Paragraph 42
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-Publisher FASB
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- Definition

Percentage, excluding accrued interest, of financing receivable modified during period for debtor experiencing financial difficulty to total financing receivables.

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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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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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