Goodwill and Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Jun. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2020
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	824	1,064	$ 824	1,064	937	$ 880	$ 1,128	$ 1,192
Estimated useful life			10 years
Goodwill impairment	0				$ 0
Aggregate amortization expense	56	$ 64	$ 113	$ 128
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