Loans, Delinquent and Nonaccrual Loans by Past Due Status (Details) $ in Thousands	Jun. 30, 2018 USD ($) Loan	Jun. 30, 2017 USD ($) Loan
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total past due	$ 7,042	$ 6,285
Current	708,599	628,046
Total loans	715,641	634,331
Loans on non-accrual	3,517	3,572
Loans in the process of foreclosure	1,900	1,600
Nonaccrual loans with recent history of delinquency greater than 90 days	1,300	1,900
Nonaccrual loans making payments pursuant to forbearance agreements	128
Accruing loans delinquent more than 90 days	62	69
30 to 59 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total past due	3,476	2,422
60 to 89 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total past due	1,298	2,143
90 Days or More Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total past due	$ 2,268	$ 1,720
Residential Real Estate [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Number of loans in the process of foreclosure | Loan	11	12
Loans in the process of foreclosure	$ 1,200	$ 967
Residential Real Estate [Member] | Residential Real Estate [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total past due	3,286	3,538
Current	252,562	241,793
Total loans	255,848	245,331
Loans on non-accrual	1,778	1,240
Residential Real Estate [Member] | Residential Real Estate [Member] | 30 to 59 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total past due	1,617	2,088
Residential Real Estate [Member] | Residential Real Estate [Member] | 60 to 89 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total past due	458	515
Residential Real Estate [Member] | Residential Real Estate [Member] | 90 Days or More Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total past due	1,211	935
Residential Real Estate [Member] | Construction and Land [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total past due	0	0
Current	9,951	7,160
Total loans	9,951	7,160
Loans on non-accrual	0	0
Residential Real Estate [Member] | Construction and Land [Member] | 30 to 59 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total past due	0	0
Residential Real Estate [Member] | Construction and Land [Member] | 60 to 89 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total past due	0	0
Residential Real Estate [Member] | Construction and Land [Member] | 90 Days or More Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total past due	0	0
Residential Real Estate [Member] | Multi-family [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total past due	0	0
Current	14,961	9,199
Total loans	14,961	9,199
Loans on non-accrual	0	0
Residential Real Estate [Member] | Multi-family [Member] | 30 to 59 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total past due	0	0
Residential Real Estate [Member] | Multi-family [Member] | 60 to 89 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total past due	0	0
Residential Real Estate [Member] | Multi-family [Member] | 90 Days or More Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total past due	0	0
Commercial Real Estate [Member] | Real Estate Mortgage [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total past due	2,623	1,684
Current	281,312	256,280
Total loans	283,935	257,964
Loans on non-accrual	1,147	1,452
Commercial Real Estate [Member] | Real Estate Mortgage [Member] | 30 to 59 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total past due	1,568	74
Commercial Real Estate [Member] | Real Estate Mortgage [Member] | 60 to 89 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total past due	487	1,070
Commercial Real Estate [Member] | Real Estate Mortgage [Member] | 90 Days or More Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total past due	568	540
Commercial Real Estate [Member] | Construction [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total past due	0	176
Current	39,366	28,254
Total loans	39,366	28,430
Loans on non-accrual	0	176
Commercial Real Estate [Member] | Construction [Member] | 30 to 59 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total past due	0	0
Commercial Real Estate [Member] | Construction [Member] | 60 to 89 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total past due	0	176
Commercial Real Estate [Member] | Construction [Member] | 90 Days or More Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total past due	0	0
Consumer Loan [Member] | Home Equity [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total past due	465	439
Current	21,454	20,637
Total loans	21,919	21,076
Loans on non-accrual	298	218
Consumer Loan [Member] | Home Equity [Member] | 30 to 59 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total past due	38	220
Consumer Loan [Member] | Home Equity [Member] | 60 to 89 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total past due	128	186
Consumer Loan [Member] | Home Equity [Member] | 90 Days or More Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total past due	299	33
Consumer Loan [Member] | Consumer Installment [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total past due	41	42
Current	4,976	4,748
Total loans	5,017	4,790
Loans on non-accrual	18	10
Consumer Loan [Member] | Consumer Installment [Member] | 30 to 59 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total past due	3	22
Consumer Loan [Member] | Consumer Installment [Member] | 60 to 89 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total past due	30	10
Consumer Loan [Member] | Consumer Installment [Member] | 90 Days or More Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total past due	8	10
Commercial Loans [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total past due	627	406
Current	84,017	59,975
Total loans	84,644	60,381
Loans on non-accrual	276	476
Commercial Loans [Member] | 30 to 59 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total past due	250	18
Commercial Loans [Member] | 60 to 89 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total past due	195	186
Commercial Loans [Member] | 90 Days or More Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total past due	$ 182	$ 202