Revenue from Contract with Customer (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Deposit Account
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 893	$ 1,014	$ 1,840	$ 1,927
Credit and Debit Card
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,275	1,247	2,526	2,523
Asset Management
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	29	44	59	123
Investment Advice
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 4	$ 8	$ 34	$ 10