Loans and Allowance for Credit Losses - Allowance for off-balance credit exposure (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Allowance for off-balance sheet credit exposure:
Balance, beginning of period	$ 2,453	$ 1,805	$ 1,959
Provision (benefit) charged to expense	388	374	615
Balance, end of period	2,842	2,179	2,842
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	59	37	19
Provision (benefit) charged to expense	(10)	(3)	(5)
Balance, end of period	49	34	49
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	768	502	769
Provision (benefit) charged to expense	174	1,171	340
Balance, end of period	942	1,673	942
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	299	188	172
Provision (benefit) charged to expense	(14)	(18)	18
Balance, end of period	285	170	285
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	354	218	153
Provision (benefit) charged to expense	(105)	(160)	(100)
Balance, end of period	250	58	250
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	973	860	846
Provision (benefit) charged to expense	343	(616)	362
Balance, end of period	1,316	$ 244	1,316
Commercial loans | Impact of adoption ASU 2016-13
Allowance for off-balance sheet credit exposure:
Balance, end of period	$ 108		$ 108