CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Operating activities:
Net income	$ 467,173	$ 422,895
Adjustments to reconcile net income to net cash provided by operating activities:
Net amortization/accretion of premium/discount on securities	44,635	50,794
Depreciation, amortization and accretion	59,417	44,686
Provision for credit losses	77,282	43,120
Gain on mortgage loans sold, net	(5,632)	(7,333)
Investment losses (gains) on sales, net	19,688	(156)
Gain on other equity investments, net	9,512	9,104
Stock-based compensation expense	29,573	30,882
Deferred tax expense	11,891	1,263
Losses (gains) on dispositions of other real estate and other investments	82	(179)
Gain on sale of fixed assets	(85,946)	425
Gain on remeasurement of previously held noncontrolling interest	0	(5,500)
Income from equity method investment	(70,970)	(124,461)
Dividends received from equity method investment	33,159	59,401
Excess tax benefit from stock compensation	(241)	(2,921)
Gain on commercial loans sold, net	(408)	(2,274)
Increase in other assets	(189,302)	(56,223)
Increase in other liabilities	61,005	43,565
Net cash provided by operating activities	371,263	500,207
Activities in securities available-for-sale:
Purchases	(914,989)	(668,860)
Sales	303,145	29,501
Maturities, prepayments and calls	108,371	336,933
Activities in securities held-to-maturity:
Purchases	0	(804,841)
Maturities, prepayments and calls	38,677	59,038
Proceeds from Securities Purchased under Agreements to Resell	13,276	471,001
Increase in loans, net	(3,062,357)	(4,290,474)
Proceeds from Sale, Loan and Lease, Held-for-Investment	117,216	0
Purchases of software, premises and equipment	(61,870)	(47,468)
Proceeds from sales of software, premises and equipment	198,414	656
Proceeds from sale of other real estate	5,749	994
Purchase of bank owned life insurance policies	0	(100,000)
Proceeds from bank owned life insurance settlements	3,221	1,002
Purchase of FHLB stock, net	(36,722)	(12,389)
Acquisition, net of cash acquired	0	30,415
Increase in other investments, net	(49,750)	(68,945)
Net cash used in investing activities	(3,337,619)	(5,124,267)
Financing activities:
Net increase in deposits	3,334,595	2,390,200
Net increase in securities sold under agreements to repurchase	1,089	37,995
Federal Home Loan Bank: Advances	3,425,000	400,000
Federal Home Loan Bank: Repayments/maturities	(1,750,000)	(400,000)
Repayments of other borrowings	0	(29,547)
Principal payments of finance lease obligation	(224)	(207)
Issuance of common stock pursuant to RSA, RSU and PSU agreements, net of shares withheld for taxes	(3,645)	(5,462)
Exercise of common stock options, net of shares surrendered for taxes	(2,794)	(4,425)
Common stock dividends paid	(51,551)	(51,115)
Preferred stock dividends paid	(11,394)	(11,394)
Net cash provided by financing activities	4,941,076	2,326,045
Net increase (decrease) in cash, cash equivalents, and restricted cash	1,974,720	(2,298,015)
Cash, cash equivalents, and restricted cash, beginning of period	1,177,382	4,101,539
Cash, cash equivalents, and restricted cash, end of period	3,152,102	1,803,524
Commercial Loan
Adjustments to reconcile net income to net cash provided by operating activities:
Loans held-for-sale originated	(315,209)	(411,833)
Loans held-for-sale sold	316,198	416,380
Consumer Loan
Adjustments to reconcile net income to net cash provided by operating activities:
Loans held-for-sale originated	(1,294,384)	(1,263,024)
Loans held-for-sale sold	$ 1,222,764	$ 1,270,654