Loans and Allowance for Loan Losses - Allowance for loan losses (Details) - USD ($)	3 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Allowance for loan losses:
Beginning balance	$ 222,884	$ 222,884
Ending balance	222,884	222,884
Commercial real estate
Allowance for loan losses:
Beginning balance	20,643	27,506
Provision (credit) for loan losses	(949)	(1,341)
Ending balance	19,694	26,165
Residential real estate
Allowance for loan losses:
Beginning balance	177,830	176,498
Provision (credit) for loan losses	(2,090)	(4,057)
Ending balance	175,740	172,441
Multifamily real estate
Allowance for loan losses:
Beginning balance	1,926
Provision (credit) for loan losses	(47)
Ending balance	1,879
Agricultural real estate
Allowance for loan losses:
Beginning balance	13,868	8,334
Provision (credit) for loan losses	2,036	3,519
Ending balance	15,904	11,853
Construction and land
Allowance for loan losses:
Beginning balance	5,477	7,723
Provision (credit) for loan losses	610	2,042
Ending balance	6,087	9,765
Home equity line of credit (HELOC)
Allowance for loan losses:
Beginning balance	1,306	577
Provision (credit) for loan losses	(110)	676
Ending balance	1,196	1,253
Commercial and industrial
Allowance for loan losses:
Beginning balance	709	1,437
Provision (credit) for loan losses	595	(782)
Ending balance	1,304	655
Consumer
Allowance for loan losses:
Beginning balance	1,125	809
Provision (credit) for loan losses	(45)	(57)
Ending balance	$ 1,080	$ 752