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, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016	Jun. 30, 2016
Activity of allowance for loan losses by loan category [Roll Forward]
Balance, beginning of period	$ 10,421	$ 8,611	$ 9,485	$ 8,142
Charge-offs	68	69	299	374
Recoveries	25	25	63	82
Provision	343	421	1,472	1,138
Balance, end of period	10,721	8,988	10,721	8,988
Allocation of allowance for loan losses by loan category [Abstract]
Allowance for loan losses, ending balance, impairment analysis individually evaluated	477		477		$ 330
Allowance for loan losses, ending balance, impairment analysis collectively evaluated	10,244		10,244		9,155
Loans receivable, ending balance, impairment analysis individually evaluated	3,700		3,700		3,242
Loans receivable, ending balance, impairment analysis collectively evaluated	612,792		612,792		528,048
Residential Real Estate [Member] | Residential Real Estate [Member]
Activity of allowance for loan losses by loan category [Roll Forward]
Balance, beginning of period	2,234	2,392	2,396	2,454
Charge-offs	0	0	90	0
Recoveries	0	0	0	0
Provision	29	29	(43)	(33)
Balance, end of period	2,263	2,421	2,263	2,421
Allocation of allowance for loan losses by loan category [Abstract]
Allowance for loan losses, ending balance, impairment analysis individually evaluated	275		275		267
Allowance for loan losses, ending balance, impairment analysis collectively evaluated	1,988		1,988		2,129
Loans receivable, ending balance, impairment analysis individually evaluated	1,463		1,463		1,723
Loans receivable, ending balance, impairment analysis collectively evaluated	238,672		238,672		233,269
Residential Real Estate [Member] | Construction and Land [Member]
Activity of allowance for loan losses by loan category [Roll Forward]
Balance, beginning of period	63	70	75	50
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision	15	1	3	21
Balance, end of period	78	71	78	71
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	78		78		75
Loans receivable, ending balance, impairment analysis individually evaluated	0		0		0
Loans receivable, ending balance, impairment analysis collectively evaluated	6,220		6,220		5,575
Residential Real Estate [Member] | Multi-family [Member]
Activity of allowance for loan losses by loan category [Roll Forward]
Balance, beginning of period	18	25	22	40
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision	16	(3)	12	(18)
Balance, end of period	34	22	34	22
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	34		34		22
Loans receivable, ending balance, impairment analysis individually evaluated	0		0		0
Loans receivable, ending balance, impairment analysis collectively evaluated	7,295		7,295		3,918
Commercial Real Estate [Member] | Real Estate [Member]
Activity of allowance for loan losses by loan category [Roll Forward]
Balance, beginning of period	5,365	4,020	4,541	3,699
Charge-offs	0	0	0	162
Recoveries	0	0	0	17
Provision	141	377	965	843
Balance, end of period	5,506	4,397	5,506	4,397
Allocation of allowance for loan losses by loan category [Abstract]
Allowance for loan losses, ending balance, impairment analysis individually evaluated	202		202		61
Allowance for loan losses, ending balance, impairment analysis collectively evaluated	5,304		5,304		4,480
Loans receivable, ending balance, impairment analysis individually evaluated	1,854		1,854		1,429
Loans receivable, ending balance, impairment analysis collectively evaluated	250,962		250,962		191,249
Commercial Real Estate [Member] | Construction [Member]
Activity of allowance for loan losses by loan category [Roll Forward]
Balance, beginning of period	603	331	502	233
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision	45	(17)	146	81
Balance, end of period	648	314	648	314
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	648		648		502
Loans receivable, ending balance, impairment analysis individually evaluated	0		0		0
Loans receivable, ending balance, impairment analysis collectively evaluated	27,575		27,575		20,159
Consumer Loan [Member] | Home Equity [Member]
Activity of allowance for loan losses by loan category [Roll Forward]
Balance, beginning of period	257	305	309	314
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision	(30)	0	(82)	(9)
Balance, end of period	227	305	227	305
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	227		227		309
Loans receivable, ending balance, impairment analysis individually evaluated	192		192		5
Loans receivable, ending balance, impairment analysis collectively evaluated	20,084		20,084		20,888
Consumer Loan [Member] | Consumer Installment [Member]
Activity of allowance for loan losses by loan category [Roll Forward]
Balance, beginning of period	224	188	228	223
Charge-offs	68	50	209	193
Recoveries	25	25	60	65
Provision	(17)	29	85	97
Balance, end of period	164	192	164	192
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	164		164		228
Loans receivable, ending balance, impairment analysis individually evaluated	0		0		0
Loans receivable, ending balance, impairment analysis collectively evaluated	4,457		4,457		4,350
Commercial Loans [Member]
Activity of allowance for loan losses by loan category [Roll Forward]
Balance, beginning of period	1,513	1,272	1,412	1,129
Charge-offs	0	19	0	19
Recoveries	0	0	3	0
Provision	58	7	156	150
Balance, end of period	1,571	1,260	1,571	1,260
Allocation of allowance for loan losses by loan category [Abstract]
Allowance for loan losses, ending balance, impairment analysis individually evaluated	0		0		2
Allowance for loan losses, ending balance, impairment analysis collectively evaluated	1,571		1,571		1,410
Loans receivable, ending balance, impairment analysis individually evaluated	191		191		85
Loans receivable, ending balance, impairment analysis collectively evaluated	57,527		57,527		48,640
Unallocated [Member]
Activity of allowance for loan losses by loan category [Roll Forward]
Balance, beginning of period	144	8	0	0
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision	86	(2)	230	6
Balance, end of period	230	$ 6	230	$ 6
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	230		230		0
Loans receivable, ending balance, impairment analysis individually evaluated	0		0		0
Loans receivable, ending balance, impairment analysis collectively evaluated	$ 0		$ 0		$ 0