Loans and Allowance for Credit Losses on Loans - Delinquent and Nonaccrual Loans by Past Due Status (Details) - USD ($) $ in Thousands		Mar. 31, 2025	Jun. 30, 2024
Delinquent and/or Nonaccrual Loans by Past Due Status [Line Items]
Total loans	[1],[2]	$ 1,619,378	$ 1,499,473
Loans on non-accrual		2,925	3,728
Commercial Portfolio [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Line Items]
Total loans		114,321	111,307
Loans on non-accrual		141	0
Residential Real Estate [Member] | Residential Portfolio [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Line Items]
Total loans		419,609	417,589
Loans on non-accrual		2,169	2,518
Real Estate [Member] | Commercial Real Estate Portfolio [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Line Items]
Total loans		1,048,572	936,640
Loans on non-accrual		584	1,163
Home Equity [Member] | Consumer Portfolio [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Line Items]
Total loans		32,380	29,166
Loans on non-accrual		31	47
Consumer [Member] | Consumer Portfolio [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Line Items]
Total loans		4,496	4,771
Loans on non-accrual		0	0
30 to 59 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Line Items]
Total loans		7,435	61
30 to 59 Days Past Due [Member] | Commercial Portfolio [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Line Items]
Total loans		110	0
30 to 59 Days Past Due [Member] | Residential Real Estate [Member] | Residential Portfolio [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Line Items]
Total loans		2,995	0
30 to 59 Days Past Due [Member] | Real Estate [Member] | Commercial Real Estate Portfolio [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Line Items]
Total loans		4,086	0
30 to 59 Days Past Due [Member] | Home Equity [Member] | Consumer Portfolio [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Line Items]
Total loans		224	14
30 to 59 Days Past Due [Member] | Consumer [Member] | Consumer Portfolio [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Line Items]
Total loans		20	47
60 to 89 Days Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Line Items]
Total loans		523	844
60 to 89 Days Past Due [Member] | Commercial Portfolio [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Line Items]
Total loans		13	0
60 to 89 Days Past Due [Member] | Residential Real Estate [Member] | Residential Portfolio [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Line Items]
Total loans		505	838
60 to 89 Days Past Due [Member] | Real Estate [Member] | Commercial Real Estate Portfolio [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Line Items]
Total loans		0	0
60 to 89 Days Past Due [Member] | Home Equity [Member] | Consumer Portfolio [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Line Items]
Total loans		0	0
60 to 89 Days Past Due [Member] | Consumer [Member] | Consumer Portfolio [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Line Items]
Total loans		5	6
90 Days or More Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Line Items]
Total loans		1,485	2,267
90 Days or More Past Due [Member] | Commercial Portfolio [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Line Items]
Total loans		77	0
90 Days or More Past Due [Member] | Residential Real Estate [Member] | Residential Portfolio [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Line Items]
Total loans		1,093	1,414
90 Days or More Past Due [Member] | Real Estate [Member] | Commercial Real Estate Portfolio [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Line Items]
Total loans		315	806
90 Days or More Past Due [Member] | Home Equity [Member] | Consumer Portfolio [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Line Items]
Total loans		0	47
90 Days or More Past Due [Member] | Consumer [Member] | Consumer Portfolio [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Line Items]
Total loans		0	0
Total Past Due [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Line Items]
Total loans		9,443	3,172
Total Past Due [Member] | Commercial Portfolio [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Line Items]
Total loans		200	0
Total Past Due [Member] | Residential Real Estate [Member] | Residential Portfolio [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Line Items]
Total loans		4,593	2,252
Total Past Due [Member] | Real Estate [Member] | Commercial Real Estate Portfolio [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Line Items]
Total loans		4,401	806
Total Past Due [Member] | Home Equity [Member] | Consumer Portfolio [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Line Items]
Total loans		224	61
Total Past Due [Member] | Consumer [Member] | Consumer Portfolio [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Line Items]
Total loans		25	53
Current [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Line Items]
Total loans		1,609,935	1,496,301
Current [Member] | Commercial Portfolio [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Line Items]
Total loans		114,121	111,307
Current [Member] | Residential Real Estate [Member] | Residential Portfolio [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Line Items]
Total loans		415,016	415,337
Current [Member] | Real Estate [Member] | Commercial Real Estate Portfolio [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Line Items]
Total loans		1,044,171	935,834
Current [Member] | Home Equity [Member] | Consumer Portfolio [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Line Items]
Total loans		32,156	29,105
Current [Member] | Consumer [Member] | Consumer Portfolio [Member]
Delinquent and/or Nonaccrual Loans by Past Due Status [Line Items]
Total loans		$ 4,471	$ 4,718

[1] Loan balances exclude accrued interest receivable of $7.2 million and $6.2 million at March 31, 2025 and June 30, 2024, respectively, which is included in accrued interest receivable in the consolidated statement of financial condition.

[2] Loan balances include net deferred fees/costs of ($217,000) and ($42,000) at March 31, 2025 and June 30, 2024, respectively.