Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Operating Activities:
Net (loss) income	$ (2,361,722)	$ 301,167
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	188,487	127,357
Goodwill impairment	2,185,000	0
Securities impairment	0	113
Amortization (accretion) of discount, loan fees and purchase market adjustments, net	59,375	(16,671)
Provision for credit losses	896,450	337,310
Net change in trading account assets	(542,990)	(202,442)
Net change in trading account liabilities	109,110	(25,954)
Originations and purchases of mortgage loans held for sale	(653,742)	(322,161)
Sale of mortgage loans held for sale	546,222	313,034
Deferred tax benefit	(154,493)	(10,957)
Investment securities gains, net	(22,616)	(8,958)
Net gain on sale of premises and equipment	(768)	(4,382)
Gain on sale of loans	0	(922)
Gain on sale of mortgage loans held for sale	(26,273)	(12,644)
Net (gain) loss on sale of other real estate and other assets	(71)	985
Increase in other assets	(8,808)	(130,642)
Increase in other liabilities	343,118	85,566
Net cash provided by operating activities	556,279	429,799
Investing Activities:
Proceeds from sales of debt securities available for sale	863,712	1,446,776
Proceeds from prepayments, maturities and calls of debt securities available for sale	2,270,565	2,366,797
Purchases of debt securities available for sale	(1,554,435)	(1,691,741)
Proceeds from prepayments, maturities and calls of debt securities held to maturity	417,039	153,060
Purchases of debt securities held to maturity	(2,362,209)	(2,182,708)
Proceeds from sales of equity securities	79,481	165,497
Purchases of equity securities	(885)	(175,561)
Net change in loan portfolio	(4,595,129)	289,420
Proceeds from sales of loans	0	1,342,479
Purchases of premises and equipment	(71,889)	(61,010)
Proceeds from sales of premises and equipment	1,762	8,271
Proceeds from settlement of BOLI policies	5,053	450
Cash payments for premiums of BOLI policies	0	(17)
Proceeds from sales of other real estate owned	11,423	16,295
Net cash (used in) provided by investing activities	(4,935,512)	1,678,008
Financing Activities:
Net increase in total deposits	10,445,442	427,990
Net increase in federal funds purchased and securities sold under agreements to repurchase	76,453	89,464
Net increase in other short-term borrowings	1,619	2,067
Proceeds from FHLB and other borrowings	1,000	3,840,000
Repayment of FHLB and other borrowings	(228,880)	(3,840,110)
Capital contribution for non-controlling interest	55	134
Vesting of restricted stock	0	(2,914)
Issuance of common stock	0	802
Common dividends paid	0	(170,000)
Preferred dividends paid	(9,157)	(10,247)
Net cash provided by financing activities	10,286,532	337,186
Net increase in cash, cash equivalents and restricted cash	5,907,299	2,444,993
Cash, cash equivalents and restricted cash at beginning of year	7,156,689	3,501,380
Cash, cash equivalents and restricted cash at end of period	$ 13,063,988	$ 5,946,373