Loans and Allowance for Credit Losses on Loans - Activity and Allocation of Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025	Jun. 30, 2025
Loans and Allowance for Credit Losses on Loans [Abstract]
Balance, beginning of period	$ 21,334	$ 20,191	$ 20,146	$ 19,244	$ 19,244
Charge-offs	(106)	(137)	(379)	(412)
Recoveries	33	41	106	107
Provision (benefit)	517	1,101	1,905	2,257
Balance, end of period	21,778	21,196	21,778	21,196	20,146
Commercial Portfolio [Member]
Loans and Allowance for Credit Losses on Loans [Abstract]
Balance, beginning of period	2,632	2,079	2,278	2,077	2,077
Charge-offs	(6)	(44)	(51)	(57)	(66)
Recoveries	9	9	23	27
Provision (benefit)	119	112	504	109
Balance, end of period	2,754	2,156	2,754	2,156	2,278
Residential Real Estate [Member] \| Residential Portfolio [Member]
Loans and Allowance for Credit Losses on Loans [Abstract]
Balance, beginning of period	4,625	4,531	4,613	4,237	4,237
Charge-offs	0	0	(43)	(44)	(44)
Recoveries	0	0	2	2
Provision (benefit)	(10)	65	43	401
Balance, end of period	4,615	4,596	4,615	4,596	4,613
Real Estate [Member] \| Commercial Real Estate Portfolio [Member]
Loans and Allowance for Credit Losses on Loans [Abstract]
Balance, beginning of period	13,419	12,933	12,614	12,218	12,218
Charge-offs	0	0	0	(5)	(5)
Recoveries	1	1	3	3
Provision (benefit)	345	865	1,148	1,583
Balance, end of period	13,765	13,799	13,765	13,799	12,614
Home Equity [Member] \| Consumer Portfolio [Member]
Loans and Allowance for Credit Losses on Loans [Abstract]
Balance, beginning of period	340	234	260	212	212
Charge-offs	0	0	0	(13)	(13)
Recoveries	0	0	0	0
Provision (benefit)	4	6	84	41
Balance, end of period	344	240	344	240	260
Consumer [Member] \| Consumer Portfolio [Member]
Loans and Allowance for Credit Losses on Loans [Abstract]
Balance, beginning of period	318	414	381	500	500
Charge-offs	(100)	(93)	(285)	(293)	(386)
Recoveries	23	31	78	75
Provision (benefit)	59	53	126	123
Balance, end of period	$ 300	$ 405	$ 300	$ 405	$ 381

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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