Goodwill and Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Jun. 30, 2023	Sep. 30, 2023	Sep. 30, 2022	Jun. 30, 2022
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 4,858	$ 4,858	$ 4,858	$ 4,858	$ 4,858	$ 4,858	$ 4,858	$ 4,858
Core deposit intangibles	$ 437	615	$ 437	615	519	$ 478	$ 664	$ 712
Estimated useful life	10 years		10 years
Goodwill impairment			$ 0		$ 0
Aggregate amortization expense	$ 41	$ 49	82	$ 97
Audubon Savings Bank
Finite-Lived Intangible Assets [Line Items]
Goodwill	4,900		4,900
Core deposit intangibles	1,400		1,400
Fidelity Savings and Loan Association
Finite-Lived Intangible Assets [Line Items]
Core deposit intangibles	65		65
Washington Savings Bank
Finite-Lived Intangible Assets [Line Items]
Core deposit intangibles	$ 197		$ 197