Loans, Loan Balances by Internal Credit Quality Indicator (Details) $ in Thousands	12 Months Ended
	Jun. 30, 2017 USD ($) Segment	Jun. 30, 2016 USD ($)
Financing Receivable, Recorded Investment [Line Items]
Number of segments within loan portfolio | Segment	4
Total gross loans	$ 634,331	$ 531,290
Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	626,864	524,661
Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	1,242	1,166
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	555	645
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	$ 5,670	4,818
Residential Real Estate [Member] | Maximum [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan-to-value ratio	89.90%
Residential Real Estate [Member] | Residential Mortgage with Private Mortgage Insurance [Member] | Maximum [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan-to-value ratio	95.00%
Residential Real Estate [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	$ 245,331	234,992
Residential Real Estate [Member] | Residential Real Estate [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	242,592	232,321
Residential Real Estate [Member] | Residential Real Estate [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	813	757
Residential Real Estate [Member] | Residential Real Estate [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	91	94
Residential Real Estate [Member] | Residential Real Estate [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	1,835	1,820
Residential Real Estate [Member] | Construction and Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	7,160	5,575
Residential Real Estate [Member] | Construction and Land [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	7,160	5,575
Residential Real Estate [Member] | Construction and Land [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	0	0
Residential Real Estate [Member] | Construction and Land [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	0	0
Residential Real Estate [Member] | Construction and Land [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	0	0
Residential Real Estate [Member] | Multi-family [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	9,199	3,918
Residential Real Estate [Member] | Multi-family [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	9,110	3,820
Residential Real Estate [Member] | Multi-family [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	0	0
Residential Real Estate [Member] | Multi-family [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	0	0
Residential Real Estate [Member] | Multi-family [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	89	98
Commercial Real Estate [Member] | Real Estate Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	257,964	192,678
Commercial Real Estate [Member] | Real Estate Mortgage [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	255,090	190,293
Commercial Real Estate [Member] | Real Estate Mortgage [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	419	52
Commercial Real Estate [Member] | Real Estate Mortgage [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	404	531
Commercial Real Estate [Member] | Real Estate Mortgage [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	2,051	1,802
Commercial Real Estate [Member] | Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	28,430	20,159
Commercial Real Estate [Member] | Construction [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	28,254	20,159
Commercial Real Estate [Member] | Construction [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	0	0
Commercial Real Estate [Member] | Construction [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	0	0
Commercial Real Estate [Member] | Construction [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	176	0
Consumer Loan [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	21,076	20,893
Consumer Loan [Member] | Home Equity [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	20,858	20,555
Consumer Loan [Member] | Home Equity [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	0	321
Consumer Loan [Member] | Home Equity [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	0	12
Consumer Loan [Member] | Home Equity [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	218	5
Consumer Loan [Member] | Consumer Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	4,790	4,350
Consumer Loan [Member] | Consumer Installment [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	4,770	4,340
Consumer Loan [Member] | Consumer Installment [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	10	10
Consumer Loan [Member] | Consumer Installment [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	0	0
Consumer Loan [Member] | Consumer Installment [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	10	0
Commercial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	60,381	48,725
Commercial Loans [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	59,030	47,598
Commercial Loans [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	0	26
Commercial Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	60	8
Commercial Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	$ 1,291	$ 1,093