Goodwill and Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Jun. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2019
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	1,064	1,054	$ 1,064	1,054	1,192	$ 1,128	$ 1,113	$ 1,172
Estimated useful life			10 years
Goodwill impairment			$ 0		$ 0
Aggregate amortization expense	64	$ 59	128	$ 118
Audubon Savings Bank
Finite-Lived Intangible Assets [Line Items]
Goodwill	4,900		4,900
Core deposit intangibles	1,400		1,400
Fidelity
Finite-Lived Intangible Assets [Line Items]
Core deposit intangibles	65		65
Washington
Finite-Lived Intangible Assets [Line Items]
Core deposit intangibles	$ 197		$ 197