Loans and Allowance for Credit Losses - Allowance for off-balance credit exposure (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Allowance for off-balance sheet credit exposure:
Balance, beginning of period	$ 2,179	$ 2,842	$ 1,805	$ 1,959
Provision (benefit) charged to expense	500	(409)	874	206
Balance, end of period	2,679	2,433	2,679	2,433
Impact of adoption ASU 2016-13
Allowance for off-balance sheet credit exposure:
Balance, end of period		268		268
Residential Real Estate
Allowance for off-balance sheet credit exposure:
Balance, beginning of period	34	49	37	19
Provision (benefit) charged to expense	49	(6)	46	(11)
Balance, end of period	83	43	83	43
Residential Real Estate | Impact of adoption ASU 2016-13
Allowance for off-balance sheet credit exposure:
Balance, end of period		35		35
Construction Real Estate
Allowance for off-balance sheet credit exposure:
Balance, beginning of period	1,673	942	502	769
Provision (benefit) charged to expense	50	(284)	1,221	56
Balance, end of period	1,723	658	1,723	658
Construction Real Estate | Impact of adoption ASU 2016-13
Allowance for off-balance sheet credit exposure:
Balance, end of period		(167)		(167)
Commercial Real Estate
Allowance for off-balance sheet credit exposure:
Balance, beginning of period	170	285	188	172
Provision (benefit) charged to expense	165	(21)	147	(3)
Balance, end of period	335	264	335	264
Commercial Real Estate | Impact of adoption ASU 2016-13
Allowance for off-balance sheet credit exposure:
Balance, end of period		95		95
Consumer loans
Allowance for off-balance sheet credit exposure:
Balance, beginning of period	58	250	218	153
Provision (benefit) charged to expense	16	8	(144)	(92)
Balance, end of period	74	258	74	258
Consumer loans | Impact of adoption ASU 2016-13
Allowance for off-balance sheet credit exposure:
Balance, end of period		197		197
Commercial loans
Allowance for off-balance sheet credit exposure:
Balance, beginning of period	244	1,316	860	846
Provision (benefit) charged to expense	220	(106)	(396)	256
Balance, end of period	$ 464	1,210	$ 464	1,210
Commercial loans | Impact of adoption ASU 2016-13
Allowance for off-balance sheet credit exposure:
Balance, end of period		$ 108		$ 108