Loans and Allowance for Loan Losses, Impaired Loans By Loan Portfolio Class (Details) - USD ($)	3 Months Ended		6 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Jun. 30, 2021
Loans and Allowance for Loan Losses [Abstract]
Threshold principal amount of nonaccrual loans evaluated individually for impairment	$ 100,000		$ 100,000
With no related allowance recorded [Abstract]
Recorded investment	1,433,000		1,433,000		$ 970,000
Unpaid principal	1,433,000		1,433,000		970,000
Average recorded investment	1,511,000	$ 986,000	1,201,000	$ 1,125,000
Interest income recognized	17,000	12,000	20,000	18,000
With an allowance recorded [Abstract]
Recorded investment	6,850,000		6,850,000		5,325,000
Unpaid principal	6,850,000		6,850,000		5,325,000
Related allowance	1,102,000		1,102,000		391,000
Average recorded investment	6,477,000	1,573,000	5,813,000	1,745,000
Interest income recognized	86,000	17,000	144,000	26,000
Total impaired [Abstract]
Recorded investment	8,283,000		8,283,000		6,295,000
Unpaid principal	8,283,000		8,283,000		6,295,000
Related allowance	1,102,000		1,102,000		391,000
Average recorded investment	7,988,000	2,559,000	7,014,000	2,870,000
Interest income recognized	103,000	29,000	164,000	44,000
Residential Real Estate [Member] | Residential Real Estate [Member]
With no related allowance recorded [Abstract]
Recorded investment	904,000		904,000		370,000
Unpaid principal	904,000		904,000		370,000
Average recorded investment	664,000	392,000	442,000	397,000
Interest income recognized	10,000	3,000	10,000	8,000
With an allowance recorded [Abstract]
Recorded investment	2,227,000		2,227,000		723,000
Unpaid principal	2,227,000		2,227,000		723,000
Related allowance	630,000		630,000		103,000
Average recorded investment	1,958,000	1,064,000	1,338,000	1,225,000
Interest income recognized	28,000	12,000	33,000	17,000
Total impaired [Abstract]
Recorded investment	3,131,000		3,131,000		1,093,000
Unpaid principal	3,131,000		3,131,000		1,093,000
Related allowance	630,000		630,000		103,000
Average recorded investment	2,622,000	1,456,000	1,780,000	1,622,000
Interest income recognized	38,000	15,000	43,000	25,000
Residential Real Estate [Member] | Multi-family [Member]
With no related allowance recorded [Abstract]
Recorded investment					0
Unpaid principal					0
Average recorded investment		0		61,000
Interest income recognized		0		0
With an allowance recorded [Abstract]
Related allowance					0
Total impaired [Abstract]
Recorded investment					0
Unpaid principal					0
Related allowance					0
Average recorded investment		0		61,000
Interest income recognized		0		0
Commercial Real Estate [Member] | Real Estate [Member]
With no related allowance recorded [Abstract]
Recorded investment	73,000		73,000		281,000
Unpaid principal	73,000		73,000		281,000
Average recorded investment	539,000	321,000	492,000	328,000
Interest income recognized	5,000	1,000	8,000	2,000
With an allowance recorded [Abstract]
Recorded investment	938,000		938,000		945,000
Unpaid principal	938,000		938,000		945,000
Related allowance	89,000		89,000		58,000
Average recorded investment	612,000	0	696,000	0
Interest income recognized	8,000	0	18,000	0
Total impaired [Abstract]
Recorded investment	1,011,000		1,011,000		1,226,000
Unpaid principal	1,011,000		1,011,000		1,226,000
Related allowance	89,000		89,000		58,000
Average recorded investment	1,151,000	321,000	1,188,000	328,000
Interest income recognized	13,000	1,000	26,000	2,000
Commercial Real Estate [Member] | Construction [Member]
With an allowance recorded [Abstract]
Recorded investment	102,000		102,000		102,000
Unpaid principal	102,000		102,000		102,000
Related allowance	1,000		1,000		1,000
Average recorded investment	102,000	102,000	102,000	102,000
Interest income recognized	0	0	0	0
Total impaired [Abstract]
Recorded investment	102,000		102,000		102,000
Unpaid principal	102,000		102,000		102,000
Related allowance	1,000		1,000		1,000
Average recorded investment	102,000	102,000	102,000	102,000
Interest income recognized	0	0	0	0
Consumer Loan [Member] | Home Equity [Member]
With no related allowance recorded [Abstract]
Recorded investment	128,000		128,000		224,000
Unpaid principal	128,000		128,000		224,000
Average recorded investment	128,000	162,000	128,000	145,000
Interest income recognized	0	0	0	0
With an allowance recorded [Abstract]
Recorded investment	321,000		321,000		321,000
Unpaid principal	321,000		321,000		321,000
Related allowance	45,000		45,000		73,000
Average recorded investment	321,000	391,000	321,000	410,000
Interest income recognized	3,000	4,000	6,000	8,000
Total impaired [Abstract]
Recorded investment	449,000		449,000		545,000
Unpaid principal	449,000		449,000		545,000
Related allowance	45,000		45,000		73,000
Average recorded investment	449,000	553,000	449,000	555,000
Interest income recognized	3,000	4,000	6,000	8,000
Commercial Loans [Member]
With no related allowance recorded [Abstract]
Recorded investment	328,000		328,000		95,000
Unpaid principal	328,000		328,000		95,000
Average recorded investment	180,000	111,000	139,000	194,000
Interest income recognized	2,000	8,000	2,000	8,000
With an allowance recorded [Abstract]
Recorded investment	3,262,000		3,262,000		3,234,000
Unpaid principal	3,262,000		3,262,000		3,234,000
Related allowance	337,000		337,000		156,000
Average recorded investment	3,484,000	16,000	3,356,000	8,000
Interest income recognized	47,000	1,000	87,000	1,000
Total impaired [Abstract]
Recorded investment	3,590,000		3,590,000		3,329,000
Unpaid principal	3,590,000		3,590,000		3,329,000
Related allowance	337,000		337,000		$ 156,000
Average recorded investment	3,664,000	127,000	3,495,000	202,000
Interest income recognized	$ 49,000	$ 9,000	$ 89,000	$ 9,000