Loans and Allowance for Loan Losses, Activity and Allocation of Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020	Jun. 30, 2020
Allowance for Loan Losses [Abstract]
Increase in provision for credit losses to reserve for losses resulting from COVID-19 pandemic	$ 1,400	$ 1,400	$ 3,900	$ 2,700
Activity of allowance for loan losses by loan category [Roll Forward]
Balance, beginning of period	18,270	13,984	16,391	13,200
Charge-offs	101	240	773	793
Recoveries	65	36	111	132
Provision	1,434	1,425	3,939	2,666
Balance, end of period	19,668	15,205	19,668	15,205
Allocation of allowance for loan losses by loan category [Abstract]
Allowance for loan losses, ending balance, impairment analysis individually evaluated	287		287		$ 228
Allowance for loan losses, ending balance, impairment analysis collectively evaluated	19,381		19,381		16,163
Loans receivable, ending balance, impairment analysis individually evaluated	3,919		3,919		3,270
Loans receivable, ending balance, impairment analysis collectively evaluated	$ 1,086,961		$ 1,086,961		1,009,390
Smaller Commercial 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	$ 1,998	1,470	$ 2,091	2,026
Charge-offs	0	0	26	101
Recoveries	3	3	10	13
Provision	(16)	391	(90)	(74)
Balance, end of period	1,985	1,864	1,985	1,864
Allocation of allowance for loan losses by loan category [Abstract]
Allowance for loan losses, ending balance, impairment analysis individually evaluated	113		113		127
Allowance for loan losses, ending balance, impairment analysis collectively evaluated	1,872		1,872		1,964
Loans receivable, ending balance, impairment analysis individually evaluated	1,108		1,108		1,863
Loans receivable, ending balance, impairment analysis collectively evaluated	304,159		304,159		277,469
Residential Real Estate [Member] | Construction and Land [Member]
Activity of allowance for loan losses by loan category [Roll Forward]
Balance, beginning of period	90	93	141	87
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision	11	8	(40)	14
Balance, end of period	101	101	101	101
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	101		101		141
Loans receivable, ending balance, impairment analysis individually evaluated	0		0		0
Loans receivable, ending balance, impairment analysis collectively evaluated	8,467		8,467		11,847
Residential Real Estate [Member] | Multi-family [Member]
Activity of allowance for loan losses by loan category [Roll Forward]
Balance, beginning of period	276	147	176	180
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision	38	6	138	(27)
Balance, end of period	314	153	314	153
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	314		314		176
Loans receivable, ending balance, impairment analysis individually evaluated	0		0		123
Loans receivable, ending balance, impairment analysis collectively evaluated	37,470		37,470		24,981
Commercial Real Estate [Member] | Real Estate [Member]
Activity of allowance for loan losses by loan category [Roll Forward]
Balance, beginning of period	10,207	7,510	8,634	7,110
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision	1,572	453	3,145	853
Balance, end of period	11,779	7,963	11,779	7,963
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	11,779		11,779		8,634
Loans receivable, ending balance, impairment analysis individually evaluated	300		300		344
Loans receivable, ending balance, impairment analysis collectively evaluated	454,492		454,492		381,071
Commercial Real Estate [Member] | Construction [Member]
Activity of allowance for loan losses by loan category [Roll Forward]
Balance, beginning of period	1,847	1,467	2,053	872
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision	94	355	(112)	950
Balance, end of period	1,941	1,822	1,941	1,822
Allocation of allowance for loan losses by loan category [Abstract]
Allowance for loan losses, ending balance, impairment analysis individually evaluated	27		27		15
Allowance for loan losses, ending balance, impairment analysis collectively evaluated	1,914		1,914		2,038
Loans receivable, ending balance, impairment analysis individually evaluated	102		102		102
Loans receivable, ending balance, impairment analysis collectively evaluated	$ 66,811		$ 66,811		74,818
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	$ 265	270	$ 295	314
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision	(64)	3	(94)	(41)
Balance, end of period	201	273	201	273
Allocation of allowance for loan losses by loan category [Abstract]
Allowance for loan losses, ending balance, impairment analysis individually evaluated	74		74		73
Allowance for loan losses, ending balance, impairment analysis collectively evaluated	127		127		222
Loans receivable, ending balance, impairment analysis individually evaluated	550		550		559
Loans receivable, ending balance, impairment analysis collectively evaluated	18,407		18,407		21,547
Consumer Loan [Member] | Consumer Installment [Member]
Activity of allowance for loan losses by loan category [Roll Forward]
Balance, beginning of period	256	366	197	250
Charge-offs	101	111	247	359
Recoveries	62	33	101	83
Provision	(59)	12	107	326
Balance, end of period	157	300	157	300
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	157		157		197
Loans receivable, ending balance, impairment analysis individually evaluated	0		0		0
Loans receivable, ending balance, impairment analysis collectively evaluated	4,499		$ 4,499		4,817
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	3,331	2,661	$ 2,804	2,361
Charge-offs	0	129	500	333
Recoveries	0	0	0	36
Provision	(141)	164	886	632
Balance, end of period	3,190	2,696	3,190	2,696
Allocation of allowance for loan losses by loan category [Abstract]
Allowance for loan losses, ending balance, impairment analysis individually evaluated	73		73		13
Allowance for loan losses, ending balance, impairment analysis collectively evaluated	3,117		3,117		2,791
Loans receivable, ending balance, impairment analysis individually evaluated	1,859		1,859		279
Loans receivable, ending balance, impairment analysis collectively evaluated	$ 192,656		$ 192,656		$ 212,840
Unallocated [Member]
Activity of allowance for loan losses by loan category [Roll Forward]
Balance, beginning of period		0		0
Charge-offs		0		0
Recoveries		0		0
Provision		33		33
Balance, end of period		$ 33		$ 33