CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Operating activities:
Net income	$ 274,237	$ 257,218
Adjustments to reconcile net income to net cash provided by operating activities:
Net amortization/accretion of premium/discount on securities	34,643	25,413
Depreciation, amortization and accretion	29,328	27,057
Provision for credit losses	15,627	10,069
Gain on mortgage loans sold, net	(6,216)	(20,366)
Investment losses (gains) on sales, net	61	(366)
Gain on other equity investments, net	8,379	10,397
Stock-based compensation expense	20,208	11,068
Deferred tax expense	2,807	4,427
Gains on dispositions of other real estate and other investments	(20)	(806)
Gain on remeasurement of previously held noncontrolling interest	(5,500)
Income from equity method investment	(83,120)	(61,021)
Dividends received from equity method investment	40,762	49,409
Excess tax benefit from stock compensation	(2,921)	(1,867)
Gain on commercial loans sold, net	(1,679)	(2,356)
Decrease in other assets	10,524	24,016
Decrease in other liabilities	(98,201)	(83,266)
Net cash provided by operating activities	200,179	287,163
Activities in securities available-for-sale:
Purchases	(597,249)	(1,075,927)
Sales	2,866	2,240
Maturities, prepayments and calls	240,767	280,795
Activities in securities held-to-maturity:
Purchases	(578,716)	0
Maturities, prepayments and calls	34,324	23,300
Increase in securities purchased under agreements to resell	(328,876)	(500,000)
Increase in loans, net	(2,899,140)	(492,984)
Purchases of software, premises and equipment	(23,065)	(10,451)
Proceeds from sales of software, premises and equipment	292	281
Proceeds from sale of other real estate	320	4,183
Purchase of bank owned life insurance policies	(75,000)	0
Proceeds from bank owned life insurance settlements	1,002	952
Proceeds from derivative instruments	0	99,710
Proceeds from sale (purchase) of FHLB stock	(15,853)
Proceeds from sale (purchase) of FHLB stock		10,329
Acquisition, net of cash acquired	(30,415)	0
Increase in other investments	(62,669)	(19,239)
Net cash used in investing activities	(4,331,412)	(1,676,811)
Financing activities:
Net increase in deposits	1,295,442	512,121
Net increase in securities sold under agreements to repurchase	47,026	49,497
Federal Home Loan Bank: Advances	400,000	0
Federal Home Loan Bank: Repayments/maturities	0	(200,000)
Repayments of other borrowings	(29,547)	0
Principal payments of finance lease obligation	(137)	(128)
Issuance of common stock pursuant to RSU and PSU agreements, net of shares withheld for taxes	(5,461)	(3,764)
Exercise of common stock options, net of shares surrendered for taxes	(4,079)	(2,791)
Common stock dividends paid	(34,041)	(27,765)
Preferred stock dividends paid	(7,596)	(7,596)
Net cash provided by financing activities	1,661,607	319,574
Net decrease in cash, cash equivalents, and restricted cash	(2,469,626)	(1,070,074)
Cash, cash equivalents, and restricted cash, beginning of period	4,101,539	3,961,449
Cash, cash equivalents, and restricted cash, end of period	1,631,913	2,891,375
Commercial Loan
Adjustments to reconcile net income to net cash provided by operating activities:
Loans held-for-sale originated	(274,755)	(288,031)
Loans held-for-sale sold	268,218	295,743
Consumer Loan
Adjustments to reconcile net income to net cash provided by operating activities:
Loans held-for-sale originated	(844,206)	(1,117,635)
Loans held-for-sale sold	$ 828,761	$ 1,168,854