Loans, Loan Balances by Internal Credit Quality Indicator (Details) $ in Thousands	12 Months Ended
	Jun. 30, 2020 USD ($) Loan Segment	Jun. 30, 2019 USD ($)
Loan Balances by Internal Credit Quality Indicator [Abstract]
Number of segments within loan portfolio | Segment	4
Total gross loans	$ 1,012,660	$ 798,105
Performing [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	979,173	779,062
Watch [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	701	1,922
Special Mention [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	25,479	10,438
Substandard [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	7,307	6,683
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	85.00%
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	85.00%
Residential Real Estate [Member] | Residential Real Estate [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	$ 279,332	267,802
Residential Real Estate [Member] | Residential Real Estate [Member] | Performing [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	274,973	264,138
Residential Real Estate [Member] | Residential Real Estate [Member] | Watch [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	626	874
Residential Real Estate [Member] | Residential Real Estate [Member] | Special Mention [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	996	86
Residential Real Estate [Member] | Residential Real Estate [Member] | Substandard [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	2,737	2,704
Residential Real Estate [Member] | Construction and Land [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	11,847	7,462
Residential Real Estate [Member] | Construction and Land [Member] | Performing [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	11,847	7,462
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	25,104	24,592
Residential Real Estate [Member] | Multi-family [Member] | Performing [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	23,336	22,544
Residential Real Estate [Member] | Multi-family [Member] | Watch [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	0	137
Residential Real Estate [Member] | Multi-family [Member] | Special Mention [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	1,645	1,835
Residential Real Estate [Member] | Multi-family [Member] | Substandard [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	123	76
Commercial Real Estate [Member] | Real Estate Mortgage [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	381,415	329,668
Commercial Real Estate [Member] | Real Estate Mortgage [Member] | Performing [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	364,884	318,703
Commercial Real Estate [Member] | Real Estate Mortgage [Member] | Watch [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	0	616
Commercial Real Estate [Member] | Real Estate Mortgage [Member] | Special Mention [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	13,189	7,435
Commercial Real Estate [Member] | Real Estate Mortgage [Member] | Substandard [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	3,342	2,914
Commercial Real Estate [Member] | Construction [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	74,920	36,361
Commercial Real Estate [Member] | Construction [Member] | Performing [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	67,844	36,259
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	6,974	0
Commercial Real Estate [Member] | Construction [Member] | Substandard [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	102	102
Consumer Loan [Member] | Home Equity [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	22,106	23,185
Consumer Loan [Member] | Home Equity [Member] | Performing [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	21,466	22,392
Consumer Loan [Member] | Home Equity [Member] | Watch [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	0	20
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	640	773
Consumer Loan [Member] | Consumer Installment [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	4,817	5,481
Consumer Loan [Member] | Consumer Installment [Member] | Performing [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	4,792	5,461
Consumer Loan [Member] | Consumer Installment [Member] | Watch [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	25	14
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	0	6
Commercial Loans [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	213,119	103,554
Commercial Loans [Member] | Performing [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	210,031	102,103
Commercial Loans [Member] | Watch [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	50	261
Commercial Loans [Member] | Special Mention [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	2,675	1,082
Commercial Loans [Member] | Substandard [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Total gross loans	$ 363	$ 108
Commercial Real Estate and Commercial Portfolio Segment [Member] | Special Mention [Member]
Loan Balances by Internal Credit Quality Indicator [Abstract]
Number of loan relationships downgraded | Loan	16