OREO and Other Repossessed Assets: Other Real Estate, Roll Forward (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2023 USD ($) property	Sep. 30, 2022 USD ($) property
OREO and Other Repossessed Assets
OREO and Other Repossessed Assets, Amount, Starting Balance | $	$ 0	$ 157
Sales of OREO and other repossessed assets, amount | $	0	(157)
OREO and Other Repossessed Assets, Amount, Ending Balance | $	$ 0	$ 0
Other Real Estate, Number Of Contracts [Roll Forward]
OREO and Other Repossessed Assets, Number, Starting Balance | property	2	3
Sales of OREO and other repossessed assets, number | property	0	(1)
OREO and Other Repossessed Assets, Number, Ending Balance | property	2	2