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Allowance for Credit Losses - Effect of loan and leases modifications (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2025 USD ($)
Effect of loan and lease modifications
Principal Forgiveness	$ 97
Weighted-Average Interest Rate Reduction	1.36%
Weighted-Average Term Extension	49 months
Residential | First Liens
Effect of loan and lease modifications
Principal Forgiveness	$ 83
Weighted-Average Interest Rate Reduction	1.17%
Residential | Junior Liens
Effect of loan and lease modifications
Principal Forgiveness	$ 60
Weighted-Average Interest Rate Reduction	1.25%
Consumer | Motor Vehicle
Effect of loan and lease modifications
Principal Forgiveness	$ 97
Weighted-Average Interest Rate Reduction	1.95%
Weighted-Average Term Extension	22 months

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Percentage of decrease in weighted average contractual interest rate of financing receivable modified for debtor experiencing financial difficulty.

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