Loans and Allowance for Credit Losses - Allowance for off-balance credit exposure (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Allowance for off-balance sheet credit exposure:
Balance, beginning of period	$ 5,618	$ 4,164	$ 6,288	$ 3,358
Provision (benefit) charged to expense	(1,022)	773	(1,692)	1,579
Balance, end of period	4,596	4,937	4,596	4,937
Residential Real Estate
Allowance for off-balance sheet credit exposure:
Balance, beginning of period	78	193	71	58
Provision (benefit) charged to expense	(1)	(123)	6	12
Balance, end of period	77	70	77	70
Construction Real Estate
Allowance for off-balance sheet credit exposure:
Balance, beginning of period	4,193	2,897	4,809	2,178
Provision (benefit) charged to expense	(1,110)	732	(1,726)	1,451
Balance, end of period	3,083	3,629	3,083	3,629
Commercial Real Estate
Allowance for off-balance sheet credit exposure:
Balance, beginning of period	465	528	475	421
Provision (benefit) charged to expense	4	(48)	(6)	59
Balance, end of period	469	480	469	480
Consumer loans
Allowance for off-balance sheet credit exposure:
Balance, beginning of period	71	61	73	61
Provision (benefit) charged to expense	(3)	(5)	(5)	(5)
Balance, end of period	68	56	68	56
Commercial loans
Allowance for off-balance sheet credit exposure:
Balance, beginning of period	811	485	860	640
Provision (benefit) charged to expense	88	217	39	62
Balance, end of period	$ 899	$ 702	$ 899	$ 702