Loans and Allowance for Credit Losses on Loans - Allowance for Credit Losses on Loans (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Jun. 30, 2025
Loans and Allowance for Credit Losses on Loans [Abstract]
Balance, beginning of period	$ 20,146	$ 19,244	$ 19,244
Charge-offs	(94)	(145)
Recoveries	34	31
Provision	1,206	651
Balance, end of period	21,292	19,781	20,146
Commercial Portfolio [Member]
Loans and Allowance for Credit Losses on Loans [Abstract]
Balance, beginning of period	2,278	2,077	2,077
Charge-offs	0	(6)	(66)
Recoveries	0	9
Provision	174	(108)
Balance, end of period	2,452	1,972	2,278
Residential Real Estate [Member] | Residential Portfolio [Member]
Loans and Allowance for Credit Losses on Loans [Abstract]
Balance, beginning of period	4,613	4,237	4,237
Charge-offs	0	(44)	(44)
Recoveries	0	2
Provision	87	280
Balance, end of period	4,700	4,475	4,613
Real Estate [Member] | Commercial Real Estate Portfolio [Member]
Loans and Allowance for Credit Losses on Loans [Abstract]
Balance, beginning of period	12,614	12,218	12,218
Charge-offs	0	(5)	(5)
Recoveries	1	1
Provision	855	434
Balance, end of period	13,470	12,648	12,614
Home Equity [Member] | Consumer Portfolio [Member]
Loans and Allowance for Credit Losses on Loans [Abstract]
Balance, beginning of period	260	212	212
Charge-offs	0	(13)	(13)
Recoveries	0	0
Provision	51	33
Balance, end of period	311	232	260
Consumer [Member] | Consumer Portfolio [Member]
Loans and Allowance for Credit Losses on Loans [Abstract]
Balance, beginning of period	381	500	500
Charge-offs	(94)	(77)	(386)
Recoveries	33	19
Provision	39	12
Balance, end of period	$ 359	$ 454	$ 381