CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating activities:
Net income	$ 137,271	$ 129,110
Adjustments to reconcile net income to net cash provided by operating activities:
Net amortization/accretion of premium/discount on securities	15,110	16,048
Depreciation, amortization and accretion	20,429	14,367
Provision for credit losses	18,767	2,720
Gain on mortgage loans sold, net	(2,053)	(4,066)
Investment losses on sales, net	0	61
Gain on other equity investments, net	2,360	1,710
Stock-based compensation expense	10,199	9,448
Deferred tax expense	20,690	15,680
Losses (gains) on dispositions of other real estate and other investments	47	(20)
Gain on remeasurement of previously held noncontrolling interest	0	(5,500)
Income from equity method investment	(19,079)	(33,655)
Dividends received from equity method investment	23,961	12,232
Excess tax benefit from stock compensation	(277)	(2,639)
Gain on commercial loans sold, net	(53)	(488)
Decrease in other assets	44,525	33,554
Increase (decrease) in other liabilities	109,102	(98,465)
Net cash provided by operating activities	359,870	52,115
Activities in securities available-for-sale:
Purchases	(223,495)	(45,579)
Sales	0	2,866
Maturities, prepayments and calls	29,216	93,330
Activities in securities held-to-maturity:
Purchases	0	(374,043)
Maturities, prepayments and calls	17,883	15,391
Proceeds from Securities Purchased under Agreements to Resell	3,404
Net decrease (increase) in securities purchased under agreements to resell		(332,753)
Increase in loans, net	(1,266,114)	(1,062,733)
Purchases of software, premises and equipment	(35,513)	(10,072)
Proceeds from sales of software, premises and equipment	418	172
Proceeds from sale of other real estate	253	319
Purchase of bank owned life insurance policies	0	(75,000)
Purchase of FHLB stock, net	(37,065)
Purchase of FHLB stock, net		0
Acquisition, net of cash acquired	0	30,415
Increase in other investments, net	(52,148)	(18,777)
Net cash used in investing activities	(1,563,161)	(1,837,294)
Financing activities:
Net increase in deposits	1,217,323	995,940
Net increase (decrease) in securities sold under agreements to repurchase	(45,133)	66,971
Federal Home Loan Bank: Advances	2,175,000	0
Federal Home Loan Bank: Repayments/maturities	(475,000)	0
Repayments of other borrowings	0	(29,547)
Principal payments of finance lease obligation	(73)	(67)
Issuance of common stock pursuant to RSU and PSU agreements, net of shares withheld for taxes	(3,645)	(5,461)
Exercise of common stock options, net of shares surrendered for taxes	(2,116)	(3,641)
Common stock dividends paid	(17,173)	(16,976)
Preferred stock dividends paid	(3,798)	(3,798)
Net cash provided by financing activities	2,845,385	1,003,421
Net increase (decrease) in cash, cash equivalents, and restricted cash	1,642,094	(781,758)
Cash, cash equivalents, and restricted cash, beginning of period	1,177,382	4,101,539
Cash, cash equivalents, and restricted cash, end of period	2,819,476	3,319,781
Commercial Loan
Adjustments to reconcile net income to net cash provided by operating activities:
Loans held-for-sale originated	(106,007)	(111,411)
Loans held-for-sale sold	104,066	94,201
Consumer Loan
Adjustments to reconcile net income to net cash provided by operating activities:
Loans held-for-sale originated	(299,238)	(417,668)
Loans held-for-sale sold	$ 284,770	$ 400,316