Loans and Allowance for Credit Losses on Loans - Major Loan Segments and Classes (Details) - USD ($) $ in Thousands		Sep. 30, 2025	Jun. 30, 2025	Sep. 30, 2024	Jun. 30, 2024
Loans and Allowance for Credit Losses on Loans [Abstract]
Total gross loans	[1],[2]	$ 1,670,847	$ 1,627,406
Allowance for credit losses on loans		(21,292)	(20,146)	$ (19,781)	$ (19,244)
Net loans receivable		1,649,555	1,607,260
Commercial Portfolio [Member]
Loans and Allowance for Credit Losses on Loans [Abstract]
Total gross loans		125,979	116,769
Allowance for credit losses on loans		(2,452)	(2,278)	(1,972)	(2,077)
Residential Real Estate [Member] | Residential Portfolio [Member]
Loans and Allowance for Credit Losses on Loans [Abstract]
Total gross loans		416,463	417,719
Allowance for credit losses on loans		(4,700)	(4,613)	(4,475)	(4,237)
Real Estate [Member] | Commercial Real Estate Portfolio [Member]
Loans and Allowance for Credit Losses on Loans [Abstract]
Total gross loans		1,086,848	1,054,504
Allowance for credit losses on loans		(13,470)	(12,614)	(12,648)	(12,218)
Home Equity [Member] | Consumer Portfolio [Member]
Loans and Allowance for Credit Losses on Loans [Abstract]
Total gross loans		37,221	34,103
Allowance for credit losses on loans		(311)	(260)	(232)	(212)
Consumer [Member] | Consumer Portfolio [Member]
Loans and Allowance for Credit Losses on Loans [Abstract]
Total gross loans		4,336	4,311
Allowance for credit losses on loans		$ (359)	$ (381)	$ (454)	$ (500)

[1] Loan balances exclude accrued interest receivable of $7.2 million and $7.0 million at September 30, 2025 and June 30, 2025, respectively, which is included in accrued interest receivable in the consolidated statement of financial condition.

[2] Loan balances include net deferred fees/(costs) of ($583,000) and ($567,000) at September 30, 2025 and June 30, 2025, respectively.