CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
INTEREST INCOME
Loans receivable	$ 337,118	$ 232,167	$ 857,251	$ 659,070
Mortgage-backed securities	17,523	10,454	41,694	31,489
Investment securities and cash equivalents	37,300	29,859	98,668	70,686
Total income	391,941	272,480	997,613	761,245
INTEREST EXPENSE
Customer accounts	154,359	70,062	367,194	153,831
Borrowings, senior debt and junior subordinated debentures	60,396	33,718	142,399	80,877
Total interest expense	214,755	103,780	509,593	234,708
Net interest income	177,186	168,700	488,020	526,537
Provision for credit losses	1,500	9,000	17,500	15,000
Net interest income after provision	175,686	159,700	470,520	511,537
NON-INTEREST INCOME
Gain (loss) on sale of investment securities	80	0	251	0
Gain (loss) on termination of hedging derivatives	54	(926)	169	(900)
Loan fee income	594	1,000	1,988	3,154
Deposit fee income	$ 6,960	$ 6,660	$ 20,460	$ 19,201
Revenue, Product and Service [Extensible Enumeration]	Deposit Account [Member]	Deposit Account [Member]	Deposit Account [Member]	Deposit Account [Member]
Other income	$ 9,567	$ 7,037	$ 21,946	$ 16,412
Total other income	17,255	13,771	44,814	37,867
NON-INTEREST EXPENSE
Compensation and benefits	57,169	50,456	180,165	150,970
Occupancy	10,904	10,444	31,193	31,464
FDIC insurance premiums	7,600	5,350	22,070	13,025
Product delivery	6,090	5,217	17,680	15,154
Information technology	13,428	11,661	39,177	36,775
Other expense	14,888	11,571	50,046	36,470
Total other expense	110,079	94,699	340,331	283,858
Gain (loss) on real estate owned, net	(124)	722	387	411
Income before income taxes	82,738	79,494	175,390	265,957
Income tax expense	18,178	17,719	36,489	58,739
Net income	64,560	61,775	138,901	207,218
Dividends on preferred stock	3,656	3,656	10,969	10,969
Net income available to common shareholders	$ 60,904	$ 58,119	$ 127,932	$ 196,249
PER SHARE DATA
Basic earnings per common share (in dollars per share)	$ 0.75	$ 0.89	$ 1.78	$ 3.00
Diluted earnings per common share (in dollars per share)	0.75	0.89	1.78	3.00
Dividends paid on common stock (in dollars per share)	$ 0.26	$ 0.25	$ 0.77	$ 0.74
Basic weighted average number of shares outstanding (in shares)	81,374,811	65,194,880	71,905,924	65,348,709
Diluted weighted average number of shares outstanding (in shares)	81,393,708	65,212,846	71,930,215	65,442,910