Commitments and Contingencies (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Reserve for unfunded loan commitments	$ 320	$ 345
Employee severance compensation plan, employee minimum service requirement (in years)	2 years
Employee severance compensation plan, period following effective date of a change in company control (in months)	12 months
Employee severance compensation plan, eligible payment, maximum compensation term (in months)	18 months