CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating activities:
Net income	$ 125,428	$ 28,356
Adjustments to reconcile net income to net cash provided by operating activities:
Net amortization/accretion of premium/discount on securities	12,195	6,799
Depreciation, amortization and accretion	14,049	10,219
Provision for credit losses	7,235	99,889
Gain on mortgage loans sold, net	(13,666)	(8,583)
Investment gains on sales, net	0	(463)
Stock-based compensation expense	5,399	5,501
Deferred tax expense (benefit)	7,537	(11,799)
Losses (gains) on dispositions of other real estate and other investments	(132)	2,309
Income from equity method investment	(28,950)	(15,592)
Dividends received from equity method investment	9,993	7,957
Excess tax benefit from stock compensation	(1,565)	(862)
Gain (Loss) on Sale of Loans and Leases	1,184	597
Decrease (increase) in other assets	70,174	(113,848)
Increase (decrease) in other liabilities	(118,902)	32,834
Net cash provided by operating activities	123,173	56,610
Activities in securities available-for-sale:
Purchases	(302,867)	(407,122)
Sales	0	30,204
Maturities, prepayments and calls	126,841	88,164
Activities in securities held-to-maturity:
Maturities, prepayments and calls	9,653	1,743
Increase in securities purchased under agreements to resell	(450,000)	0
Increase in loans, net	(672,239)	(611,836)
Purchases of software, premises and equipment	(5,704)	(6,334)
Proceeds from sale of other real estate	1,980	1,796
Proceeds from derivative instruments	0	35,680
Proceeds from sale of FHLB stock	7,883	0
Increase in other investments	(20,456)	(10,893)
Net cash used in investing activities	(1,304,909)	(878,598)
Financing activities:
Net increase in deposits	587,418	1,152,246
Net increase in securities sold under agreements to repurchase	43,954	60,194
Federal Home Loan Bank: Advances	0	650,000
Federal Home Loan Bank: Repayments/maturities	(200,000)	(395,014)
Advances of other borrowings, net of issuance costs	0	(65)
Repayments of other borrowings	0	(80,000)
Principal payments of finance lease obligation	(64)	(59)
Issuance of common stock pursuant to restricted stock unit agreement, net of shares withheld for taxes	(3,761)	(2,468)
Exercise of common stock options, net of shares surrendered for taxes	(2,152)	(1,953)
Repurchase of common stock	0	(50,790)
Common stock dividends paid	(13,902)	(12,442)
Preferred stock dividends paid	(3,798)	0
Net cash provided by financing activities	407,695	1,319,649
Net increase (decrease) in cash, cash equivalents, and restricted cash	(774,041)	497,661
Cash, cash equivalents, and restricted cash, beginning of period	3,961,449	526,707
Cash, cash equivalents, and restricted cash, end of period	3,187,408	1,024,368
Commercial Loan
Adjustments to reconcile net income to net cash provided by operating activities:
Loans held-for-sale originated	(115,154)	(78,671)
Loans held-for-sale sold	134,997	90,003
Consumer Loan
Adjustments to reconcile net income to net cash provided by operating activities:
Loans held-for-sale originated	(640,024)	(366,423)
Loans held-for-sale sold	$ 655,743	$ 369,581