Loans and Allowance for Loan Losses, Activity and Allocation of Allowance for Loan Losses (Details) - USD ($)	3 Months Ended		9 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021	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	21,684,000	$ 18,270,000	19,668,000	$ 16,391,000
Charge-offs	144,000	101,000	462,000	773,000
Recoveries	36,000	65,000	102,000	111,000
Provision	163,000	1,434,000	2,431,000	3,939,000
Balance, end of period	21,739,000	19,668,000	21,739,000	19,668,000
Allocation of allowance for loan losses by loan category [Abstract]
Allowance for loan losses, ending balance, impairment analysis individually evaluated	2,123,000		2,123,000		$ 391,000
Allowance for loan losses, ending balance, impairment analysis collectively evaluated	19,616,000		19,616,000		19,277,000
Loans receivable, ending balance, impairment analysis individually evaluated	10,885,000		10,885,000		6,295,000
Loans receivable, ending balance, impairment analysis collectively evaluated	$ 1,144,514,000		$ 1,144,514,000		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	$ 1,981,000	1,998,000	$ 2,012,000	2,091,000
Charge-offs	0	0	0	26,000
Recoveries	3,000	3,000	10,000	10,000
Provision	22,000	(16,000)	(16,000)	(90,000)
Balance, end of period	2,006,000	1,985,000	2,006,000	1,985,000
Allocation of allowance for loan losses by loan category [Abstract]
Allowance for loan losses, ending balance, impairment analysis individually evaluated	601,000		601,000		103,000
Allowance for loan losses, ending balance, impairment analysis collectively evaluated	1,405,000		1,405,000		1,909,000
Loans receivable, ending balance, impairment analysis individually evaluated	2,993,000		2,993,000		1,093,000
Loans receivable, ending balance, impairment analysis collectively evaluated	339,311,000		339,311,000		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	115,000	90,000	106,000	141,000
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision	2,000	11,000	11,000	(40,000)
Balance, end of period	117,000	101,000	117,000	101,000
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	117,000		117,000		106,000
Loans receivable, ending balance, impairment analysis individually evaluated	0		0		0
Loans receivable, ending balance, impairment analysis collectively evaluated	14,054,000		14,054,000		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	76,000	276,000	186,000	176,000
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision	10,000	38,000	(100,000)	138,000
Balance, end of period	86,000	314,000	86,000	314,000
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	86,000		86,000		186,000
Loans receivable, ending balance, impairment analysis individually evaluated	0		0		0
Loans receivable, ending balance, impairment analysis collectively evaluated	51,100,000		51,100,000		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	15,616,000	10,207,000	13,049,000	8,634,000
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision	276,000	1,572,000	2,843,000	3,145,000
Balance, end of period	15,892,000	11,779,000	15,892,000	11,779,000
Allocation of allowance for loan losses by loan category [Abstract]
Allowance for loan losses, ending balance, impairment analysis individually evaluated	1,147,000		1,147,000		58,000
Allowance for loan losses, ending balance, impairment analysis collectively evaluated	14,745,000		14,745,000		12,991,000
Loans receivable, ending balance, impairment analysis individually evaluated	3,791,000		3,791,000		1,226,000
Loans receivable, ending balance, impairment analysis collectively evaluated	531,812,000		531,812,000		471,661,000
Commercial Real Estate [Member] | Construction [Member]
Activity of allowance for loan losses by loan category [Roll Forward]
Balance, beginning of period	1,250,000	1,847,000	1,535,000	2,053,000
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision	(121,000)	94,000	(406,000)	(112,000)
Balance, end of period	1,129,000	1,941,000	1,129,000	1,941,000
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	1,128,000		1,128,000		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	$ 77,201,000		$ 77,201,000		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	$ 89,000	265,000	$ 165,000	295,000
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision	(2,000)	(64,000)	(78,000)	(94,000)
Balance, end of period	87,000	201,000	87,000	201,000
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	42,000		42,000		92,000
Loans receivable, ending balance, impairment analysis individually evaluated	448,000		448,000		545,000
Loans receivable, ending balance, impairment analysis collectively evaluated	17,947,000		17,947,000		17,740,000
Consumer Loan [Member] | Consumer Installment [Member]
Activity of allowance for loan losses by loan category [Roll Forward]
Balance, beginning of period	280,000	256,000	267,000	197,000
Charge-offs	144,000	101,000	355,000	247,000
Recoveries	32,000	62,000	89,000	101,000
Provision	95,000	(59,000)	262,000	107,000
Balance, end of period	263,000	157,000	263,000	157,000
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	263,000		263,000		267,000
Loans receivable, ending balance, impairment analysis individually evaluated	5,000		5,000		0
Loans receivable, ending balance, impairment analysis collectively evaluated	4,360,000		$ 4,360,000		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	2,277,000	3,331,000	$ 2,348,000	2,804,000
Charge-offs	0	0	107,000	500,000
Recoveries	1,000	0	3,000	0
Provision	(119,000)	(141,000)	(85,000)	886,000
Balance, end of period	2,159,000	$ 3,190,000	2,159,000	$ 3,190,000
Allocation of allowance for loan losses by loan category [Abstract]
Allowance for loan losses, ending balance, impairment analysis individually evaluated	329,000		329,000		156,000
Allowance for loan losses, ending balance, impairment analysis collectively evaluated	1,830,000		1,830,000		2,192,000
Loans receivable, ending balance, impairment analysis individually evaluated	3,546,000		3,546,000		3,329,000
Loans receivable, ending balance, impairment analysis collectively evaluated	$ 108,729,000		$ 108,729,000		$ 168,899,000