Loans and Allowance for Credit Losses on Loans, Nonaccrual Loans (Details) $ in Thousands		9 Months Ended
		Mar. 31, 2024 USD ($) Loan		Jun. 30, 2023 USD ($) Loan
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		$ 1,477,635	[1],[2]	$ 1,408,866
Total loans	[3]			1,408,791
Loans on non-accrual		5,639		5,458
Nonaccrual loans with recent history of delinquency greater than 90 days		1,700		3,100
Loan repayments		482
Loans returning to performing status		93
Charge-offs		182
Loans placed into nonperforming status		940
Accruing loans delinquent more than 90 days				0
Total Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		6,425
Total loans				3,202
30 to 59 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		2,414
Total loans				111
60 to 89 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		113
Total loans				740
90 Days or More Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		3,898
Total loans				2,351
Current [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		$ 1,471,210
Total loans				$ 1,405,589
Residential Real Estate [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Number of loans in the process of foreclosure | Loan		2		3
Loans in the process of foreclosure		$ 446		$ 625
Residential Real Estate [Member] | Residential Real Estate [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		411,555
Total loans				372,443
Loans on non-accrual		2,672		2,747
Residential Real Estate [Member] | Residential Real Estate [Member] | Total Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		3,093
Total loans				2,108
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		1,710
Total loans				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		0
Total loans				504
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		1,383
Total loans				1,604
Residential Real Estate [Member] | Residential Real Estate [Member] | Current [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		$ 408,462
Total loans				370,335
Residential Real Estate [Member] | Construction and Land [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans				19,072
Loans on non-accrual				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
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
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
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
Residential Real Estate [Member] | Construction and Land [Member] | Current [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans				19,072
Residential Real Estate [Member] | Multi-family [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans				66,496
Loans on non-accrual				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
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
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
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
Residential Real Estate [Member] | Multi-family [Member] | Current [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans				$ 66,496
Commercial Real Estate [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		$ 1,400
Commercial Real Estate [Member] | Real Estate [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		924,777
Total loans				693,436
Loans on non-accrual		1,664		1,318
Commercial Real Estate [Member] | Real Estate [Member] | Total Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		1,878
Total loans				887
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		631
Total loans				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		0
Total loans				235
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		1,247
Total loans				652
Commercial Real Estate [Member] | Real Estate [Member] | Current [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		922,899
Total loans				692,549
Commercial Real Estate [Member] | Construction [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans				121,958
Loans on non-accrual				0
Commercial Real Estate [Member] | Construction [Member] | Total Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans				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
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
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
Commercial Real Estate [Member] | Construction [Member] | Current [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans				121,958
Consumer Loan [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans				108,022
Consumer Loan [Member] | Home Equity [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		27,659
Total loans				22,752
Loans on non-accrual		48		54
Consumer Loan [Member] | Home Equity [Member] | Total Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		63
Total loans				61
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		50
Total loans				48
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
Total loans				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		13
Total loans				13
Consumer Loan [Member] | Home Equity [Member] | Current [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		27,596
Total loans				22,691
Consumer Loan [Member] | Consumer [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		4,721
Total loans				4,612
Loans on non-accrual		0		63
Consumer Loan [Member] | Consumer [Member] | Total Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		29
Total loans				127
Consumer Loan [Member] | Consumer [Member] | 30 to 59 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		22
Total loans				63
Consumer Loan [Member] | Consumer [Member] | 60 to 89 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		7
Total loans				1
Consumer Loan [Member] | Consumer [Member] | 90 Days or More Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		0
Total loans				63
Consumer Loan [Member] | Consumer [Member] | Current [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		4,692
Total loans				4,485
Commercial Loans [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		108,923
Total loans				108,022
Loans on non-accrual		$ 1,255		1,276
Number of loans in the process of foreclosure | Loan		1
Loans in the process of foreclosure		$ 1,700
Commercial Loans [Member] | Total Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		1,362
Total loans				19
Commercial Loans [Member] | 30 to 59 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		1
Total loans				0
Commercial Loans [Member] | 60 to 89 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		106
Total loans				0
Commercial Loans [Member] | 90 Days or More Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		1,255
Total loans				19
Commercial Loans [Member] | Current [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Abstract]
Total loans		$ 107,561
Total loans				$ 108,003

[1] Loan balances exclude accrued interest receivable of $6.7 million at March 31, 2024, which is included in accrued interest receivable in the consolidated statement of financial condition.

[2] Loan balances include net deferred fees/cost of $167 at March 31, 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.