CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
INTEREST INCOME
Loans receivable	$ 279,476	$ 337,118	$ 848,150	$ 857,251
Mortgage-backed securities	27,855	17,523	70,118	41,694
Investment securities and cash equivalents	24,383	37,300	94,647	98,668
Total income	331,714	391,941	1,012,915	997,613
INTEREST EXPENSE
Customer accounts	146,735	154,359	460,833	367,194
Borrowings, senior debt and junior subordinated debentures	16,991	60,396	67,753	142,399
Total interest expense	163,726	214,755	528,586	509,593
Net interest income	167,988	177,186	484,329	488,020
Provision for credit losses	2,000	1,500	4,750	17,500
Net interest income after provision	165,988	175,686	479,579	470,520
NON-INTEREST INCOME
Gain on sale of investment securities	0	80	20	251
Gain on termination of hedging derivatives	56	54	126	169
Loan fee income	1,650	594	4,807	1,988
Deposit fee income	$ 7,588	$ 6,960	$ 21,691	$ 20,460
Revenue, Product and Service [Extensible Enumeration]	Deposit Account [Member]	Deposit Account [Member]	Deposit Account [Member]	Deposit Account [Member]
Other income	$ 8,979	$ 9,567	$ 26,212	$ 21,946
Total non-interest income	18,273	17,255	52,856	44,814
NON-INTEREST EXPENSE
Compensation and benefits	53,481	57,169	166,118	180,165
Occupancy	11,755	10,904	34,042	31,193
FDIC insurance premiums	5,150	7,600	15,800	22,070
Product delivery	6,621	6,090	19,313	17,680
Information technology	15,022	13,428	43,695	39,177
Other expense	12,298	14,888	41,502	50,046
Total non-interest expense	104,327	110,079	320,470	340,331
Gain (loss) on real estate owned, net	(176)	(124)	54	387
Income before income taxes	79,758	82,738	212,019	175,390
Income tax expense	17,806	18,178	46,548	36,489
Net income	61,952	64,560	165,471	138,901
Dividends on preferred stock	3,656	3,656	10,968	10,969
Net income available to common shareholders	$ 58,296	$ 60,904	$ 154,503	$ 127,932
PER SHARE DATA
Basic earnings per common share (in dollars per share)	$ 0.73	$ 0.75	$ 1.91	$ 1.78
Diluted earnings per common share (in dollars per share)	0.73	0.75	1.91	1.78
Dividends paid on common stock (in dollars per share)	$ 0.27	$ 0.26	$ 0.80	$ 0.77
Basic weighted average shares outstanding (in shares)	79,888,520	81,374,811	80,748,838	71,905,924
Diluted weighted average shares outstanding (in shares)	79,907,672	81,393,708	80,821,807	71,930,215