Loans, Delinquent and Nonaccrual Loans by Past Due Status (Details)	Jun. 30, 2021 USD ($) Loan	Jun. 30, 2020 USD ($) Loan
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	$ 1,108,408,000	$ 1,012,660,000
Loans on non-accrual	2,301,000	4,077,000
Loans in the process of foreclosure	260,000	1,300,000
Nonaccrual loans with recent history of delinquency greater than 90 days	1,200,000	1,400,000
Accruing loans delinquent more than 90 days	0	0
Substandard [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	32,982,000	7,307,000
Total Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	7,352,000	4,707,000
30 to 59 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	59,000	1,377,000
60 to 89 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	6,179,000	631,000
90 Days or More Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	1,114,000	2,699,000
Current [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	$ 1,101,056,000	$ 1,007,953,000
Residential Real Estate [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Number of loans in the process of foreclosure | Loan	2	8
Loans in the process of foreclosure	$ 158,000	$ 1,000,000
Real Estate Mortgage [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Number of loans in the process of foreclosure | Loan	1
Loans in the process of foreclosure	$ 102,000
Residential Real Estate [Member] | Residential Real Estate [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	325,167,000	279,332,000
Loans on non-accrual	1,324,000	2,513,000
Residential Real Estate [Member] | Residential Real Estate [Member] | Substandard [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	3,253,000	2,737,000
Residential Real Estate [Member] | Residential Real Estate [Member] | Total Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	1,280,000	2,907,000
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 loans	0	871,000
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 loans	630,000	345,000
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 loans	650,000	1,691,000
Residential Real Estate [Member] | Residential Real Estate [Member] | Current [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	323,887,000	276,425,000
Residential Real Estate [Member] | Construction and Land [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	10,185,000	11,847,000
Loans on non-accrual	0	0
Residential Real Estate [Member] | Construction and Land [Member] | Substandard [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	0	0
Residential Real Estate [Member] | Construction and Land [Member] | Total Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	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 loans	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 loans	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 loans	0	0
Residential Real Estate [Member] | Construction and Land [Member] | Current [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	10,185,000	11,847,000
Residential Real Estate [Member] | Multi-family [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	41,951,000	25,104,000
Loans on non-accrual	0	151,000
Residential Real Estate [Member] | Multi-family [Member] | Substandard [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	362,000	123,000
Residential Real Estate [Member] | Multi-family [Member] | Total Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	0	151,000
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 loans	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 loans	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 loans	0	151,000
Residential Real Estate [Member] | Multi-family [Member] | Current [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	$ 41,951,000	24,953,000
Commercial Real Estate [Member] | 60 to 89 Days Past Due [Member] | Substandard [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Number of delinquent loans | Loan	1
Commercial Real Estate [Member] | Real Estate Mortgage [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	$ 472,887,000	381,415,000
Loans on non-accrual	444,000	781,000
Commercial Real Estate [Member] | Real Estate Mortgage [Member] | Substandard [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	22,193,000	3,342,000
Commercial Real Estate [Member] | Real Estate Mortgage [Member] | Total Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	5,389,000	956,000
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 loans	0	393,000
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 loans	5,266,000	189,000
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 loans	123,000	374,000
Commercial Real Estate [Member] | Real Estate Mortgage [Member] | Current [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	467,498,000	380,459,000
Commercial Real Estate [Member] | Construction [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	62,763,000	74,920,000
Loans on non-accrual	0	0
Commercial Real Estate [Member] | Construction [Member] | Substandard [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	1,000,000	102,000
Commercial Real Estate [Member] | Construction [Member] | Total Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	0	0
Commercial Real Estate [Member] | Construction [Member] | 30 to 59 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	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 loans	0	0
Commercial Real Estate [Member] | Construction [Member] | 90 Days or More Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	0	0
Commercial Real Estate [Member] | Construction [Member] | Current [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	62,763,000	74,920,000
Consumer Loan [Member] | Home Equity [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	18,285,000	22,106,000
Loans on non-accrual	237,000	319,000
Consumer Loan [Member] | Home Equity [Member] | Substandard [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	558,000	640,000
Consumer Loan [Member] | Home Equity [Member] | Total Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	297,000	267,000
Consumer Loan [Member] | Home Equity [Member] | 30 to 59 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	33,000	29,000
Consumer Loan [Member] | Home Equity [Member] | 60 to 89 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	40,000	0
Consumer Loan [Member] | Home Equity [Member] | 90 Days or More Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	224,000	238,000
Consumer Loan [Member] | Home Equity [Member] | Current [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	17,988,000	21,839,000
Consumer Loan [Member] | Consumer Installment [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	4,942,000	4,817,000
Loans on non-accrual	0	0
Consumer Loan [Member] | Consumer Installment [Member] | Substandard [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	0	0
Consumer Loan [Member] | Consumer Installment [Member] | Total Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	39,000	61,000
Consumer Loan [Member] | Consumer Installment [Member] | 30 to 59 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	26,000	36,000
Consumer Loan [Member] | Consumer Installment [Member] | 60 to 89 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	13,000	25,000
Consumer Loan [Member] | Consumer Installment [Member] | 90 Days or More Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	0	0
Consumer Loan [Member] | Consumer Installment [Member] | Current [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	4,903,000	4,756,000
Commercial Loans [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	172,228,000	213,119,000
Loans on non-accrual	296,000	313,000
Commercial Loans [Member] | Substandard [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	5,616,000	363,000
Commercial Loans [Member] | Total Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	347,000	365,000
Commercial Loans [Member] | 30 to 59 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	0	48,000
Commercial Loans [Member] | 60 to 89 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	230,000	72,000
Commercial Loans [Member] | 90 Days or More Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	117,000	245,000
Commercial Loans [Member] | Current [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	$ 171,881,000	$ 212,754,000