Loans - Loan modification (Details)	12 Months Ended
	Jun. 30, 2022 USD ($) loan	Jun. 30, 2021 USD ($) loan	Jun. 30, 2020 loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans modified | loan		0	0
Commitments to lend additional funds on restructured loans	$ 0
Threshold loan modification period due to COVID19	3 months
Loan modification potential extension period, maximum, due to COVID 19	6 months
Deferred fee income recognized	$ 483,484	$ 404,038
Paycheck Protection Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans provided | loan	277
Loans provided	$ 18,400,000
Processing fees	0	628,000
PPPLF
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans provided	$ 0	$ 10,378,681