Loans and Allowance for Credit Losses - Allowance for off-balance credit exposure (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023	Jun. 30, 2023
Allowance for off-balance sheet credit exposure:
Balance, beginning of period	$ 4,596	$ 4,937	$ 6,288	$ 3,358	$ 3,358
Provision (benefit) charged to expense	(458)	2,887	(2,150)	4,466
Balance, end of period	4,138	7,824	4,138	7,824	6,288
Residential Real Estate
Allowance for off-balance sheet credit exposure:
Balance, beginning of period	77	70	71	58	58
Provision (benefit) charged to expense	26	35	32	47
Balance, end of period	103	105	103	105	71
Construction Real Estate
Allowance for off-balance sheet credit exposure:
Balance, beginning of period	3,083	3,629	4,809	2,178	2,178
Provision (benefit) charged to expense	(453)	1,949	(2,179)	3,400
Balance, end of period	2,630	5,578	2,630	5,578	4,809
Commercial Real Estate
Allowance for off-balance sheet credit exposure:
Balance, beginning of period	469	480	475	421	421
Provision (benefit) charged to expense	(53)	(139)	(59)	(80)
Balance, end of period	416	341	416	341	475
Consumer loans
Allowance for off-balance sheet credit exposure:
Balance, beginning of period	68	56	73	61	61
Provision (benefit) charged to expense	5	46		41
Balance, end of period	73	102	73	102	73
Commercial loans
Allowance for off-balance sheet credit exposure:
Balance, beginning of period	899	702	860	640	640
Provision (benefit) charged to expense	17	996	56	1,058
Balance, end of period	$ 916	$ 1,698	$ 916	$ 1,698	$ 860