Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Interest and dividend income
Loans receivable and loans held for sale	$ 63,154	$ 51,324	$ 52,539
Investment securities	9,384	3,488	1,195
Dividends from mutual funds, FHLB stock and other investments	270	120	111
Interest-bearing deposits in banks and CDs	7,143	3,576	1,117
Total interest and dividend income	79,951	58,508	54,962
Interest expense
Deposits	11,302	2,657	3,013
FHLB borrowings	290	17	91
Total interest expense	11,592	2,674	3,104
Net interest income	68,359	55,834	51,858
Provision for loan losses	2,132	270	0
Net interest income after provision for loan losses	66,227	55,564	51,858
Non-interest income
Net recoveries on investment securities	9	22	20
Gain on sales of investment securities, net	95	0	0
BOLI net earnings	706	613	597
Gain on sales of loans, net	244	1,510	5,904
Valuation recovery on loan servicing rights, net	0	119	110
Other, net	959	975	1,245
Total non-interest income, net	11,140	12,624	17,161
Non-interest expense
Salaries and employee benefits	23,562	20,816	18,750
Premises and equipment	3,915	3,736	3,942
(Gain) loss on sales/dispositions of premises and equipment, net	(19)	13	0
Advertising	786	695	625
OREO and other repossessed assets, net	1	(17)	(87)
ATM and debit card interchange transaction fees	1,987	1,943	1,831
Postage and courier	532	577	587
Amortization of CDI	271	316	361
State and local taxes	1,219	1,062	1,088
Professional fees	2,078	1,747	1,006
Federal Deposit Insurance Corporation ("FDIC") insurance	711	506	415
Loan administration and foreclosure	503	508	471
Technology and communications	3,545	2,719	2,510
Deposit operations	1,368	1,235	1,091
Other	2,914	2,770	2,001
Total non-interest expense, net	43,373	38,626	34,591
Income before income taxes and equity in undistributed     income of Bank	33,994	29,562	34,428
Provision for income taxes	6,876	5,962	6,845
Net income	$ 27,118	$ 23,600	$ 27,583
Net income per common share
Basic (in dollars per share)	$ 3.32	$ 2.84	$ 3.31
Diluted (in dollars per share)	$ 3.29	$ 2.82	$ 3.27
Service charges on deposits
Non-interest income
Service charges on deposits	$ 3,824	$ 3,964	$ 3,911
ATM and debit card interchange transaction fees
Non-interest income
Service charges on deposits	5,194	5,210	5,084
Escrow fees
Non-interest income
Service charges on deposits	109	211	$ 290
Fee income from non-deposit investment sales
Non-interest income
Service charges on deposits	$ 36	$ 27