Consolidated Statements of Income - USD ($)	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Interest and dividend income
Loans receivable and loans held for sale	$ 85,525,000	$ 77,430,000	$ 63,154,000
Investment securities	8,197,000	9,129,000	9,384,000
Dividends from mutual funds, FHLB stock and other investments	335,000	361,000	270,000
Interest-bearing deposits in banks and CDs	8,220,000	7,905,000	7,143,000
Total interest and dividend income	102,277,000	94,825,000	79,951,000
Interest expense
Deposits	31,272,000	29,659,000	11,302,000
FHLB borrowings	805,000	999,000	290,000
Total interest expense	32,077,000	30,658,000	11,592,000
Net interest income	70,200,000	64,167,000	68,359,000
Provision for (recapture of) credit losses
Provision for credit losses - loans	853,000	1,254,000	2,132,000
Recapture of credit losses - investment securities	(24,000)	(32,000)	0
Provision for (recapture of) credit losses - unfunded commitments	105,000	(71,000)	0
Total provision for credit losses - net	934,000	1,151,000	2,132,000
Net interest income after provision for (recapture of) credit losses	69,266,000	63,016,000	66,227,000
Non-interest income
Net recoveries on investment securities	14,000	12,000	9,000
Gain on sales of investment securities, net	24,000	0	95,000
BOLI net earnings	1,702,000	645,000	706,000
Gain on sales of loans, net	511,000	322,000	244,000
Other, net	975,000	895,000	963,000
Total non-interest income, net	12,352,000	11,136,000	11,140,000
Non-interest expense
Salaries and employee benefits	23,922,000	23,730,000	23,562,000
Premises and equipment	4,112,000	3,998,000	3,915,000
Gain on sales/dispositions of premises and equipment, net	0	(2,000)	(19,000)
Advertising	761,000	761,000	786,000
OREO and other repossessed assets, net	20,000	5,000	1,000
ATM and debit card interchange transaction fees	2,279,000	2,384,000	1,987,000
Postage and courier	544,000	538,000	532,000
Amortization of CDI	180,000	226,000	271,000
State and local taxes	1,682,000	1,322,000	1,219,000
Professional fees	1,676,000	1,317,000	2,078,000
Federal Deposit Insurance Corporation ("FDIC") insurance	851,000	833,000	711,000
Loan administration and foreclosure	534,000	521,000	503,000
Technology and communications	4,369,000	4,264,000	3,545,000
Deposit operations	1,347,000	1,540,000	1,368,000
Other	3,110,000	2,309,000	2,914,000
Total non-interest expense, net	45,387,000	43,746,000	43,373,000
Income before income taxes and equity in undistributed     income of Bank	36,231,000	30,406,000	33,994,000
Provision for income taxes	7,070,000	6,123,000	6,876,000
Net income	$ 29,161,000	$ 24,283,000	$ 27,118,000
Net income per common share
Basic (in dollars per share)	$ 3.68	$ 3.02	$ 3.32
Diluted (in dollars per share)	$ 3.67	$ 3.01	$ 3.29
Service charges on deposits
Non-interest income
Service charges on deposits	$ 3,915,000	$ 4,062,000	$ 3,824,000
ATM and debit card interchange transaction fees
Non-interest income
Service charges on deposits	4,975,000	5,066,000	5,194,000
Escrow fees
Non-interest income
Service charges on deposits	96,000	71,000	109,000
Servicing income (loss) on loans sold
Non-interest income
Service charges on deposits	$ 140,000	$ 63,000	$ (4,000)