Loans and Allowance for Loan Losses, Delinquent and/or Nonaccrual Loans by Past Due Status (Details)	3 Months Ended
	Sep. 30, 2021 USD ($) Loan	Jun. 30, 2021 USD ($) Loan
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	$ 1,118,784,000	$ 1,108,408,000
Loans on non-accrual	1,900,000	2,301,000
Loans in the process of foreclosure	260,000	260,000
Nonaccrual loans with recent history of delinquency greater than 90 days	1,400,000	1,200,000
Loan repayments	304,000
Charge-offs	97,000
Accruing loans delinquent more than 90 days	0	0
Total Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	8,467,000	7,352,000
30 to 59 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	66,000	59,000
60 to 89 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	7,901,000	6,179,000
90 Days or More Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	500,000	1,114,000
Current [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	1,110,317,000	1,101,056,000
Residential Real Estate [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Loans in the process of foreclosure	$ 158,000	$ 158,000
Number of loans in the process of foreclosure | Loan	2	2
Residential Real Estate [Member] | Residential Real Estate [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	$ 326,274,000	$ 325,167,000
Loans on non-accrual	1,150,000	1,324,000
Residential Real Estate [Member] | Residential Real Estate [Member] | Total Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	2,025,000	1,280,000
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	0
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	1,799,000	630,000
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	226,000	650,000
Residential Real Estate [Member] | Residential Real Estate [Member] | Current [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	324,249,000	323,887,000
Residential Real Estate [Member] | Construction and Land [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	12,645,000	10,185,000
Loans on non-accrual	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	12,645,000	10,185,000
Residential Real Estate [Member] | Multi-family [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	43,530,000	41,951,000
Loans on non-accrual	0	0
Residential Real Estate [Member] | Multi-family [Member] | Total Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	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 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	0
Residential Real Estate [Member] | Multi-family [Member] | Current [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	43,530,000	41,951,000
Commercial Real Estate [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Loans in the process of foreclosure	$ 102,000	$ 102,000
Number of loans in the process of foreclosure | Loan	1	1
Commercial Real Estate [Member] | Real Estate [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	$ 511,117,000	$ 472,887,000
Loans on non-accrual	428,000	444,000
Commercial Real Estate [Member] | Real Estate [Member] | Total Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	5,666,000	5,389,000
Commercial Real Estate [Member] | Real Estate [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] | Real Estate [Member] | 60 to 89 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	5,543,000	5,266,000
Commercial Real Estate [Member] | Real Estate [Member] | 90 Days or More Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	123,000	123,000
Commercial Real Estate [Member] | Real Estate [Member] | Current [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	505,451,000	467,498,000
Commercial Real Estate [Member] | Construction [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	61,698,000	62,763,000
Loans on non-accrual	0	0
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	61,698,000	62,763,000
Consumer Loan [Member] | Home Equity [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	18,736,000	18,285,000
Loans on non-accrual	140,000	237,000
Consumer Loan [Member] | Home Equity [Member] | Total Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	160,000	297,000
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	32,000	33,000
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	0	40,000
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	128,000	224,000
Consumer Loan [Member] | Home Equity [Member] | Current [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	18,576,000	17,988,000
Consumer Loan [Member] | Consumer Installment [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	4,897,000	4,942,000
Loans on non-accrual	0	0
Consumer Loan [Member] | Consumer Installment [Member] | Total Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	40,000	39,000
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	34,000	26,000
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	6,000	13,000
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	4,857,000	4,903,000
Commercial Loans [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	139,887,000	172,228,000
Loans on non-accrual	182,000	296,000
Commercial Loans [Member] | Total Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	576,000	347,000
Commercial Loans [Member] | 30 to 59 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	0	0
Commercial Loans [Member] | 60 to 89 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	553,000	230,000
Commercial Loans [Member] | 90 Days or More Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	23,000	117,000
Commercial Loans [Member] | Current [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans	$ 139,311,000	$ 171,881,000