Loans and Allowance for Loan Losses, Activity and Allocation of Allowance for Loan Losses (Details) - USD ($)	3 Months Ended		6 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Jun. 30, 2021
Allowance for Loan Losses [Abstract]
Threshold principal amount of nonaccrual loans evaluated individually for impairment	$ 100,000		$ 100,000
Activity of allowance for loan losses by loan category [Roll Forward]
Balance, beginning of period	20,493,000	$ 17,596,000	19,668,000	$ 16,391,000
Charge-offs	117,000	611,000	318,000	672,000
Recoveries	28,000	23,000	66,000	46,000
Provision	1,280,000	1,262,000	2,268,000	2,505,000
Balance, end of period	21,684,000	18,270,000	21,684,000	18,270,000
Allocation of allowance for loan losses by loan category [Abstract]
Allowance for loan losses, ending balance, impairment analysis individually evaluated	1,102,000		1,102,000		$ 391,000
Allowance for loan losses, ending balance, impairment analysis collectively evaluated	20,582,000		20,582,000		19,277,000
Loans receivable, ending balance, impairment analysis individually evaluated	8,283,000		8,283,000		6,295,000
Loans receivable, ending balance, impairment analysis collectively evaluated	$ 1,136,913,000		$ 1,136,913,000		1,102,113,000
Smaller Business Loans [Member] | Unsecured [Member]
Allowance for Loan Losses [Abstract]
Threshold period to charge off loans against allowance for loan losses	90 days		90 days
Residential Real Estate [Member] | Residential Real Estate [Member]
Activity of allowance for loan losses by loan category [Roll Forward]
Balance, beginning of period	$ 1,997,000	1,463,000	$ 2,012,000	2,091,000
Charge-offs	0	26,000	0	26,000
Recoveries	7,000	4,000	7,000	7,000
Provision	(23,000)	557,000	(38,000)	(74,000)
Balance, end of period	1,981,000	1,998,000	1,981,000	1,998,000
Allocation of allowance for loan losses by loan category [Abstract]
Allowance for loan losses, ending balance, impairment analysis individually evaluated	630,000		630,000		103,000
Allowance for loan losses, ending balance, impairment analysis collectively evaluated	1,351,000		1,351,000		1,909,000
Loans receivable, ending balance, impairment analysis individually evaluated	3,131,000		3,131,000		1,093,000
Loans receivable, ending balance, impairment analysis collectively evaluated	331,254,000		331,254,000		324,074,000
Residential Real Estate [Member] | Construction and Land [Member]
Activity of allowance for loan losses by loan category [Roll Forward]
Balance, beginning of period	120,000	118,000	106,000	141,000
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision	(5,000)	(28,000)	9,000	(51,000)
Balance, end of period	115,000	90,000	115,000	90,000
Allocation of allowance for loan losses by loan category [Abstract]
Allowance for loan losses, ending balance, impairment analysis individually evaluated	0		0		0
Allowance for loan losses, ending balance, impairment analysis collectively evaluated	115,000		115,000		106,000
Loans receivable, ending balance, impairment analysis individually evaluated	0		0		0
Loans receivable, ending balance, impairment analysis collectively evaluated	13,884,000		13,884,000		10,185,000
Residential Real Estate [Member] | Multi-family [Member]
Activity of allowance for loan losses by loan category [Roll Forward]
Balance, beginning of period	100,000	180,000	186,000	176,000
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision	(24,000)	96,000	(110,000)	100,000
Balance, end of period	76,000	276,000	76,000	276,000
Allocation of allowance for loan losses by loan category [Abstract]
Allowance for loan losses, ending balance, impairment analysis individually evaluated	0		0		0
Allowance for loan losses, ending balance, impairment analysis collectively evaluated	76,000		76,000		186,000
Loans receivable, ending balance, impairment analysis individually evaluated	0		0		0
Loans receivable, ending balance, impairment analysis collectively evaluated	44,450,000		44,450,000		41,951,000
Commercial Real Estate [Member] | Real Estate [Member]
Activity of allowance for loan losses by loan category [Roll Forward]
Balance, beginning of period	14,298,000	9,384,000	13,049,000	8,634,000
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision	1,318,000	823,000	2,567,000	1,573,000
Balance, end of period	15,616,000	10,207,000	15,616,000	10,207,000
Allocation of allowance for loan losses by loan category [Abstract]
Allowance for loan losses, ending balance, impairment analysis individually evaluated	89,000		89,000		58,000
Allowance for loan losses, ending balance, impairment analysis collectively evaluated	15,527,000		15,527,000		12,991,000
Loans receivable, ending balance, impairment analysis individually evaluated	1,011,000		1,011,000		1,226,000
Loans receivable, ending balance, impairment analysis collectively evaluated	533,233,000		533,233,000		471,661,000
Commercial Real Estate [Member] | Construction [Member]
Activity of allowance for loan losses by loan category [Roll Forward]
Balance, beginning of period	1,198,000	1,961,000	1,535,000	2,053,000
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision	52,000	(114,000)	(285,000)	(206,000)
Balance, end of period	1,250,000	1,847,000	1,250,000	1,847,000
Allocation of allowance for loan losses by loan category [Abstract]
Allowance for loan losses, ending balance, impairment analysis individually evaluated	1,000		1,000		1,000
Allowance for loan losses, ending balance, impairment analysis collectively evaluated	1,249,000		1,249,000		1,534,000
Loans receivable, ending balance, impairment analysis individually evaluated	102,000		102,000		102,000
Loans receivable, ending balance, impairment analysis collectively evaluated	$ 75,315,000		$ 75,315,000		62,661,000
Consumer Loan [Member] | Unsecured [Member]
Allowance for Loan Losses [Abstract]
Threshold period to charge off loans against allowance for loan losses	90 days		90 days
Consumer Loan [Member] | Home Equity [Member]
Activity of allowance for loan losses by loan category [Roll Forward]
Balance, beginning of period	$ 140,000	272,000	$ 165,000	295,000
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision	(51,000)	(7,000)	(76,000)	(30,000)
Balance, end of period	89,000	265,000	89,000	265,000
Allocation of allowance for loan losses by loan category [Abstract]
Allowance for loan losses, ending balance, impairment analysis individually evaluated	45,000		45,000		73,000
Allowance for loan losses, ending balance, impairment analysis collectively evaluated	44,000		44,000		92,000
Loans receivable, ending balance, impairment analysis individually evaluated	449,000		449,000		545,000
Loans receivable, ending balance, impairment analysis collectively evaluated	18,354,000		18,354,000		17,740,000
Consumer Loan [Member] | Consumer Installment [Member]
Activity of allowance for loan losses by loan category [Roll Forward]
Balance, beginning of period	290,000	350,000	267,000	197,000
Charge-offs	107,000	85,000	211,000	146,000
Recoveries	20,000	19,000	57,000	39,000
Provision	77,000	(28,000)	167,000	166,000
Balance, end of period	280,000	256,000	280,000	256,000
Allocation of allowance for loan losses by loan category [Abstract]
Allowance for loan losses, ending balance, impairment analysis individually evaluated	0		0		0
Allowance for loan losses, ending balance, impairment analysis collectively evaluated	280,000		280,000		267,000
Loans receivable, ending balance, impairment analysis individually evaluated	0		0		0
Loans receivable, ending balance, impairment analysis collectively evaluated	4,669,000		$ 4,669,000		4,942,000
Consumer Loan [Member] | Consumer Installment [Member] | Unsecured [Member]
Allowance for Loan Losses [Abstract]
Threshold period to charge off overdrawn deposit accounts against allowance for loan losses			60 days
Commercial Loans [Member]
Activity of allowance for loan losses by loan category [Roll Forward]
Balance, beginning of period	2,350,000	3,868,000	$ 2,348,000	2,804,000
Charge-offs	10,000	500,000	107,000	500,000
Recoveries	1,000	0	2,000	0
Provision	(64,000)	(37,000)	34,000	1,027,000
Balance, end of period	2,277,000	$ 3,331,000	2,277,000	$ 3,331,000
Allocation of allowance for loan losses by loan category [Abstract]
Allowance for loan losses, ending balance, impairment analysis individually evaluated	337,000		337,000		156,000
Allowance for loan losses, ending balance, impairment analysis collectively evaluated	1,940,000		1,940,000		2,192,000
Loans receivable, ending balance, impairment analysis individually evaluated	3,590,000		3,590,000		3,329,000
Loans receivable, ending balance, impairment analysis collectively evaluated	$ 115,754,000		$ 115,754,000		$ 168,899,000