Consolidated Statements Of Income - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
INTEREST AND DIVIDEND INCOME:
Loans receivable	$ 308,707	$ 280,087	$ 228,531
Mortgage-backed securities ("MBS")	33,650	18,520	19,406
Cash and cash equivalents	15,728	43,796	18,304
FHLB stock	10,009	13,821	10,031
Investment securities	8,749	3,565	3,268
Total interest and dividend income	376,843	359,789	279,540
INTEREST EXPENSE:
Deposits	139,549	82,267	34,456
Borrowings	75,233	124,250	52,490
Total interest expense	214,782	206,517	86,946
NET INTEREST INCOME	162,061	153,272	192,594
PROVISION FOR CREDIT LOSSES	1,259	6,838	(4,630)
NET INTEREST INCOME AFTER PROVISION FOR CREDIT LOSSES	160,802	146,434	197,224
NON-INTEREST INCOME:
Revenue from contracts with customers	15,300	17,600	18,100
Net loss from securities transactions	(13,345)	(192,622)	0
Other non-interest income	4,770	4,935	6,085
Total non-interest income	5,244	(171,455)	22,830
NON-INTEREST EXPENSE:
Salaries and employee benefits	52,272	51,491	56,600
Information technology and related expense	20,324	23,425	18,311
Occupancy, net	13,558	14,236	14,370
Federal insurance premium	6,052	4,456	3,020
Regulatory and outside services	5,743	6,039	6,192
Advertising and promotional	4,264	4,305	5,178
Deposit and loan transaction costs	2,719	2,694	2,797
Office supplies and related expense	1,691	2,499	1,951
Other non-interest expense	5,320	4,789	4,432
Total non-interest expense	111,943	113,934	112,851
INCOME (LOSS) BEFORE INCOME TAX EXPENSE (BENEFIT)	54,103	(138,955)	107,203
INCOME TAX EXPENSE (BENEFIT)	16,093	(37,296)	22,750
NET INCOME (LOSS)	$ 38,010	$ (101,659)	$ 84,453
Basic earnings (loss) per share ("EPS")	$ 0.29	$ (0.76)	$ 0.62
Diluted EPS	$ 0.29	$ (0.76)	$ 0.62
Deposit service fees [Member]
NON-INTEREST INCOME:
Revenue from contracts with customers	$ 10,562	$ 12,745	$ 13,798
Insurance commissions [Member]
NON-INTEREST INCOME:
Revenue from contracts with customers	$ 3,257	$ 3,487	$ 2,947