CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019
Operating Activities
Net income		$ 223,286	$ 412,096
Adjustments to reconcile net income to net cash (used) provided by operating activities:
Provision for credit losses	[1]	343,956	63,250
Depreciation, amortization, and accretion, net		77,385	8,969
Deferred income tax (benefit) expense		(60,433)	42,594
Originations of loans held for sale		2,221,302	603,086
Proceeds from sales of loans held for sale		1,657,738	527,354
Gain on sales of loans held for sale, net		50,001	15,453
Gain on sales of loans held for sale, net		(397,220)	(135,448)
Increase (decrease) in other liabilities		234,018	32,345
Investment securities (gains) losses, net		(76,594)	5,502
Goodwill impairment		44,877	0
Loss on early extinguishment of debt		2,057	4,592
Share-based compensation expense		13,873	21,396
Net cash (used in) provided by operating activities		(208,360)	364,111
Investing Activities
Net cash received in business combination, net of cash paid		0	201,100
Proceeds from maturities and principal collections of investment securities available for sale		1,567,889	780,538
Proceeds from sales of investment securities available for sale		3,932,368	2,456,137
Purchases of investment securities available for sale		(6,180,812)	(3,614,139)
Proceeds from sales of equity securities		23,141	0
Proceeds from sales of loans		1,293,366	71,530
Proceeds from sales of other real estate and other assets		18,204	15,859
Net increase in loans		(3,703,203)	(1,278,772)
Net redemptions (purchases) of Federal Home Loan Bank stock		96,772	(75,735)
Net purchases of Federal Reserve Bank stock		(454)	(45,856)
Net (purchases) proceeds from settlement of bank-owned life insurance policies		(248,023)	15,208
Net increase in premises and equipment		(22,786)	(40,195)
Net cash used in investing activities		(3,223,538)	(1,514,325)
Financing Activities
Net increase in deposits		6,259,108	(185,362)
Net increase in federal funds purchased and securities sold under repurchase agreements		36,655	(69,412)
Net change in other short-term borrowings		(1,353,560)	1,582,000
Repayments and redemption of long-term debt		(1,776,913)	(157,226)
Proceeds from issuance of long-term debt, net		1,248,441	497,045
Dividends paid to common shareholders		(141,353)	(123,446)
Dividends paid to preferred shareholders		(24,872)	(9,450)
Proceeds from issuance of Preferred stock		0	341,410
Stock options and warrants exercised		6,511	11,162
Repurchase of common stock		(16,246)	(688,860)
Taxes paid related to net share settlement of equity awards		(7,428)	(8,741)
Net cash provided by financing activities		4,230,343	1,189,120
Increase in cash and cash equivalents including restricted cash		798,445	38,906
Cash, cash equivalents, restricted cash, and restricted cash equivalents at beginning of period		1,186,918	1,143,564
Cash, cash equivalents, restricted cash, and restricted cash equivalents at end of period		1,985,363	1,182,470
Supplemental Disclosures:
Income taxes paid		68,253	88,480
Interest paid		268,046	350,388
Non-cash Activities
Common stock issued, treasury stock reissued, equity awards/warrants exchanged to acquire FCB		0	1,625,688
Loans foreclosed and transferred to other real estate		2,163	14,084
Loans transferred to loans held for sale at fair value		46,178	0
Dividends declared on common stock during the period but paid after period-end		48,614	44,476
Dividends declared on preferred stock during the period but paid after period-end		$ 5,141	$ 5,141

[1] Beginning January 1, 2020, provision calculation is based on current expected credit loss methodology. Prior to January 1, 2020, calculation was based on incurred loss methodology.