Loans, Loan Balances by Internal Credit Quality Indicator (Details) $ in Thousands	12 Months Ended
	Jun. 30, 2018 USD ($) Segment	Jun. 30, 2017 USD ($)
Loan Balances by Internal Credit Quality Indicator [Abstract]
Number of segments within loan portfolio | Segment	4
Total gross loans	$ 715,641	$ 634,331
Performing [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	697,059	626,864
Watch [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	1,247	1,242
Special Mention [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	11,671	555
Increase in loans	11,100
Substandard [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	5,664	5,670
Doubtful [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	0	0
Loss [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	$ 0	0
Residential Real Estate [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Loan-to-value ratio	89.90%
Residential Real Estate [Member] | Residential Mortgage with Private Mortgage Insurance [Member] | Maximum [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Loan-to-value ratio	95.00%
Residential Real Estate [Member] | Residential Real Estate [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	$ 255,848	245,331
Residential Real Estate [Member] | Residential Real Estate [Member] | Performing [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	252,811	242,592
Residential Real Estate [Member] | Residential Real Estate [Member] | Watch [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	577	813
Residential Real Estate [Member] | Residential Real Estate [Member] | Special Mention [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	88	91
Residential Real Estate [Member] | Residential Real Estate [Member] | Substandard [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	2,372	1,835
Residential Real Estate [Member] | Construction and Land [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	9,951	7,160
Residential Real Estate [Member] | Construction and Land [Member] | Performing [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	9,951	7,160
Residential Real Estate [Member] | Construction and Land [Member] | Watch [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	0	0
Residential Real Estate [Member] | Construction and Land [Member] | Special Mention [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	0	0
Residential Real Estate [Member] | Construction and Land [Member] | Substandard [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	0	0
Residential Real Estate [Member] | Multi-family [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	14,961	9,199
Residential Real Estate [Member] | Multi-family [Member] | Performing [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	12,743	9,110
Residential Real Estate [Member] | Multi-family [Member] | Watch [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	0	0
Residential Real Estate [Member] | Multi-family [Member] | Special Mention [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	2,132	0
Residential Real Estate [Member] | Multi-family [Member] | Substandard [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	86	89
Commercial Real Estate [Member] | Real Estate Mortgage [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	283,935	257,964
Commercial Real Estate [Member] | Real Estate Mortgage [Member] | Performing [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	273,077	255,090
Commercial Real Estate [Member] | Real Estate Mortgage [Member] | Watch [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	317	419
Commercial Real Estate [Member] | Real Estate Mortgage [Member] | Special Mention [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	8,994	404
Commercial Real Estate [Member] | Real Estate Mortgage [Member] | Substandard [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	1,547	2,051
Commercial Real Estate [Member] | Construction [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	39,366	28,430
Commercial Real Estate [Member] | Construction [Member] | Performing [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	39,190	28,254
Commercial Real Estate [Member] | Construction [Member] | Watch [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	0	0
Commercial Real Estate [Member] | Construction [Member] | Special Mention [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	0	0
Commercial Real Estate [Member] | Construction [Member] | Substandard [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	176	176
Consumer Loan [Member] | Home Equity [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	21,919	21,076
Consumer Loan [Member] | Home Equity [Member] | Performing [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	21,170	20,858
Consumer Loan [Member] | Home Equity [Member] | Watch [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	128	0
Consumer Loan [Member] | Home Equity [Member] | Special Mention [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	0	0
Consumer Loan [Member] | Home Equity [Member] | Substandard [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	621	218
Consumer Loan [Member] | Consumer Installment [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	5,017	4,790
Consumer Loan [Member] | Consumer Installment [Member] | Performing [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	4,969	4,770
Consumer Loan [Member] | Consumer Installment [Member] | Watch [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	30	10
Consumer Loan [Member] | Consumer Installment [Member] | Special Mention [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	0	0
Consumer Loan [Member] | Consumer Installment [Member] | Substandard [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	18	10
Commercial Loans [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	84,644	60,381
Commercial Loans [Member] | Performing [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	83,148	59,030
Commercial Loans [Member] | Watch [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	195	0
Commercial Loans [Member] | Special Mention [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	457	60
Commercial Loans [Member] | Substandard [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	$ 844	$ 1,291