Goodwill and Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 4,858	$ 4,858	$ 4,858	$ 4,858
Core deposit intangibles	$ 478	664	519	$ 712
Estimated useful life	10 years
Goodwill impairment	$ 0		$ 0
Aggregate amortization expense	41	$ 48
Audubon Savings Bank
Finite-Lived Intangible Assets [Line Items]
Goodwill	4,900
Core deposit intangibles	1,400
Fidelity Savings and Loan Association
Finite-Lived Intangible Assets [Line Items]
Core deposit intangibles	65
Washington Savings Bank
Finite-Lived Intangible Assets [Line Items]
Core deposit intangibles	$ 197