Loans and Allowance for Credit Losses on Loans - Major Loan Segments and Classes (Details) - USD ($) $ in Thousands		Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023
Major Loan Segments and Classes [Line Items]
Total gross loans	[1],[2]	$ 1,551,400		$ 1,499,473
Allowance for credit losses on loans		(20,191)	$ (19,781)	(19,244)	$ (20,309)	$ (20,249)	$ (21,212)
Net loans receivable		1,531,209		1,480,229
Commercial Portfolio [Member]
Major Loan Segments and Classes [Line Items]
Total gross loans		112,908		111,307
Allowance for credit losses on loans		(2,079)	(1,972)	(2,077)	(3,098)	(3,346)	(3,201)
Residential Real Estate [Member] | Residential Portfolio [Member]
Major Loan Segments and Classes [Line Items]
Total gross loans		418,968		417,589
Allowance for credit losses on loans		(4,531)	(4,475)	(4,237)	(4,010)	(3,869)	(2,794)
Real Estate [Member] | Commercial Real Estate Portfolio [Member]
Major Loan Segments and Classes [Line Items]
Total gross loans		983,072		936,640
Allowance for credit losses on loans		(12,933)	(12,648)	(12,218)	(12,523)	(12,356)	(14,839)
Home Equity [Member] | Consumer Portfolio [Member]
Major Loan Segments and Classes [Line Items]
Total gross loans		31,780		29,166
Allowance for credit losses on loans		(234)	(232)	(212)	(192)	(188)	(46)
Consumer [Member] | Consumer Portfolio [Member]
Major Loan Segments and Classes [Line Items]
Total gross loans		4,672		4,771
Allowance for credit losses on loans		$ (414)	$ (454)	$ (500)	$ (486)	$ (490)	$ (332)

[1] Loan balances exclude accrued interest receivable of $6.9 million and $6.2 million at December 31, 2024 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 ($188,000) and ($42,000) at December 31, 2024 and June 30, 2024, respectively.