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Revenue from Contract with Customer (Details) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Deposit Account
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 959,000	$ 988,000	$ 1,958,000	$ 2,011,000
Credit and Debit Card
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,176,000	1,212,000	2,443,000	2,476,000
Asset Management
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	17,000	15,000	35,000	33,000
Investment Advice
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 1,000	$ 2,000	$ 2,000	$ 3,000

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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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