Goodwill and Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023	Jun. 30, 2023	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	May 01, 2020	Jul. 01, 2018
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 4,858	$ 4,858	$ 4,858	$ 4,858	$ 4,858	$ 4,858	$ 4,858	$ 4,858	$ 4,858	$ 4,858
Core deposit intangibles	$ 396	566	$ 396	566	519	$ 437	$ 478	$ 615	$ 664	$ 712
Estimated useful life	10 years		10 years
Goodwill impairment			$ 0		$ 0
Aggregate amortization expense	$ 41	$ 49	$ 123	$ 146
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