Loans and Allowance for Credit Losses on Loans, Delinquent and Nonaccrual Loans by Past Due Status (Details)		Jun. 30, 2024 USD ($) Loan		Jun. 30, 2023 USD ($) Loan
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		$ 1,499,473,000	[1],[2]	$ 1,408,866,000
Total loans	[3]			1,408,791,000
Loans on non-accrual		3,728,000		5,458,000
Loans in the process of foreclosure				2,000
Nonaccrual loans with recent history of delinquency greater than 90 days				3,100,000
Accruing loans delinquent more than 90 days				0
Total Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		3,172,000
Total loans				3,202,000
30 to 59 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		61,000
Total loans				111,000
60 to 89 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		844,000
Total loans				740,000
90 Days or More Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		2,267,000
Total loans				2,351,000
Current [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		$ 1,496,301,000
Total loans				$ 1,405,589,000
Residential Portfolio [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Number of loans in the process of foreclosure | Loan		4		3
Loans in the process of foreclosure		$ 686,000		$ 625,000
Residential Portfolio [Member] | Residential Real Estate [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		417,589,000
Total loans				372,443,000
Loans on non-accrual		2,518,000		2,747,000
Residential Portfolio [Member] | Residential Real Estate [Member] | Total Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		2,252,000
Total loans				2,108,000
Residential Portfolio [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
Total loans				0
Residential Portfolio [Member] | Residential Real Estate [Member] | 60 to 89 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		838,000
Total loans				504,000
Residential Portfolio [Member] | Residential Real Estate [Member] | 90 Days or More Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		1,414,000
Total loans				1,604,000
Residential Portfolio [Member] | Residential Real Estate [Member] | Current [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		$ 415,337,000
Total loans				370,335,000
Residential Portfolio [Member] | Construction and Land [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans				19,072,000
Loans on non-accrual				0
Residential Portfolio [Member] | Construction and Land [Member] | Total Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans				0
Residential Portfolio [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
Residential Portfolio [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
Residential Portfolio [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
Residential Portfolio [Member] | Construction and Land [Member] | Current [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans				19,072,000
Residential Portfolio [Member] | Multi-family [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans				66,496,000
Loans on non-accrual				0
Residential Portfolio [Member] | Multi-family [Member] | Total Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans				0
Residential Portfolio [Member] | Multi-family [Member] | 30 to 59 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans				0
Residential Portfolio [Member] | Multi-family [Member] | 60 to 89 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans				0
Residential Portfolio [Member] | Multi-family [Member] | 90 Days or More Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans				0
Residential Portfolio [Member] | Multi-family [Member] | Current [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans				$ 66,496,000
Residential Portfolio [Member] | Real Estate Mortgage [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Number of loans in the process of foreclosure | Loan		4
Loans in the process of foreclosure		$ 596,000
Commercial Real Estate Portfolio [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Number of loans in the process of foreclosure | Loan		3		2
Loans in the process of foreclosure		$ 1,600,000		$ 1,400
Commercial Real Estate Portfolio [Member] | Real Estate Mortgage [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		936,640,000
Total loans				693,436,000
Loans on non-accrual		$ 1,163,000		1,318,000
Number of loans in the process of foreclosure | Loan		3
Loans in the process of foreclosure		$ 1,500,000
Commercial Real Estate Portfolio [Member] | Real Estate Mortgage [Member] | Total Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		806,000
Total loans				887,000
Commercial Real Estate Portfolio [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
Total loans				0
Commercial Real Estate Portfolio [Member] | Real Estate Mortgage [Member] | 60 to 89 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		0
Total loans				235,000
Commercial Real Estate Portfolio [Member] | Real Estate Mortgage [Member] | 90 Days or More Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		806,000
Total loans				652,000
Commercial Real Estate Portfolio [Member] | Real Estate Mortgage [Member] | Current [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		935,834,000
Total loans				692,549,000
Commercial Real Estate Portfolio [Member] | Construction [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans				121,958,000
Loans on non-accrual				0
Commercial Real Estate Portfolio [Member] | Construction [Member] | Total Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans				0
Commercial Real Estate Portfolio [Member] | Construction [Member] | 30 to 59 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans				0
Commercial Real Estate Portfolio [Member] | Construction [Member] | 60 to 89 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans				0
Commercial Real Estate Portfolio [Member] | Construction [Member] | 90 Days or More Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans				0
Commercial Real Estate Portfolio [Member] | Construction [Member] | Current [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans				121,958,000
Consumer Portfolio [Member] | Home Equity [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		29,166,000
Total loans				22,752,000
Loans on non-accrual		47,000		54,000
Consumer Portfolio [Member] | Home Equity [Member] | Total Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		61,000
Total loans				61,000
Consumer Portfolio [Member] | Home Equity [Member] | 30 to 59 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		14,000
Total loans				48,000
Consumer Portfolio [Member] | Home Equity [Member] | 60 to 89 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		0
Total loans				0
Consumer Portfolio [Member] | Home Equity [Member] | 90 Days or More Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		47,000
Total loans				13,000
Consumer Portfolio [Member] | Home Equity [Member] | Current [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		29,105,000
Total loans				22,691,000
Consumer Portfolio [Member] | Consumer Installment [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		4,771,000
Total loans				4,612,000
Loans on non-accrual		0		63,000
Consumer Portfolio [Member] | Consumer Installment [Member] | Total Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		53,000
Total loans				127,000
Consumer Portfolio [Member] | Consumer Installment [Member] | 30 to 59 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		47,000
Total loans				63,000
Consumer Portfolio [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
Total loans				1,000
Consumer Portfolio [Member] | Consumer Installment [Member] | 90 Days or More Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		0
Total loans				63,000
Consumer Portfolio [Member] | Consumer Installment [Member] | Current [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		4,718,000
Total loans				4,485,000
Commercial Portfolio [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		111,307,000
Total loans				108,022,000
Loans on non-accrual		0		1,276,000
Commercial Portfolio [Member] | Total Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		0
Total loans				19,000
Commercial Portfolio [Member] | 30 to 59 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		0
Total loans				0
Commercial Portfolio [Member] | 60 to 89 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		0
Total loans				0
Commercial Portfolio [Member] | 90 Days or More Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		0
Total loans				19,000
Commercial Portfolio [Member] | Current [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		$ 111,307,000
Total loans				$ 108,003,000

[1] Loan balances exclude accrued interest receivable of $6.2 million at June 30, 2024, which is included in accrued interest receivable in the consolidated statement of financial condition.

[2] Loan balances include net deferred fees/cost of $(42,000) at June 30, 2024.

[3] Loan balances exclude accrued interest receivable of $5.5 million at June 30, 2023, which is included in accrued interest receivable in the consolidated statement of financial condition.