Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating Activities:
Net (loss) income	$ (2,237,285)	$ 140,981
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	104,267	85,705
Goodwill impairment	2,185,000	0
Accretion of discount, loan fees and purchase market adjustments, net	(8,070)	(13,557)
Provision for credit losses	356,991	182,292
Net change in trading account assets	(535,154)	(68,467)
Net change in trading account liabilities	124,326	(30,075)
Originations and purchases of mortgage loans held for sale	(209,524)	(127,894)
Sale of mortgage loans held for sale	212,605	124,857
Deferred tax (benefit) expense	(66,187)	666
Investment securities gains, net	(19,139)	(8,958)
Net gain on sale of premises and equipment	(483)	(1,297)
Loss on sale of loans	0	78
Gain on sale of mortgage loans held for sale	(8,775)	(5,135)
Net loss on sale of other real estate and other assets	625	1,305
Increase in other assets	(7,625)	(177,149)
Increase in other liabilities	111,425	46,979
Net cash provided by operating activities	2,997	150,331
Investing Activities:
Proceeds from sales of debt securities available for sale	607,655	1,446,776
Proceeds from prepayments, maturities and calls of debt securities available for sale	1,137,698	1,065,045
Purchases of debt securities available for sale	(769,621)	(772,086)
Proceeds from prepayments, maturities and calls of debt securities held to maturity	204,481	88,119
Purchases of debt securities held to maturity	(1,298,774)	(1,779,789)
Proceeds from sales of equity securities	16,479	165,495
Purchases of equity securities	(883)	(168,209)
Net change in loan portfolio	(3,702,303)	(7,043)
Proceeds from sales of loans	0	144,596
Purchases of premises and equipment	(25,811)	(31,735)
Proceeds from sales of premises and equipment	1,377	1,543
Proceeds from settlement of BOLI policies	442	0
Cash payments for premiums of BOLI policies	0	(9)
Proceeds from sales of other real estate owned	5,301	7,115
Net cash (used in) provided by investing activities	(3,823,959)	159,818
Financing Activities:
Net increase in total deposits	2,251,788	2,215,223
Net increase in federal funds purchased and securities sold under agreements to repurchase	236,756	85,749
Net increase in other short-term borrowings	0	30,975
Proceeds from FHLB and other borrowings	1,000	3,840,000
Repayment of FHLB and other borrowings	(1,057)	(3,840,055)
Capital contribution for non-controlling interest	7	101
Issuance of common stock	0	802
Preferred dividends paid	(4,155)	(4,485)
Net cash provided by financing activities	2,484,339	2,328,310
Net (decrease) increase in cash, cash equivalents and restricted cash	(1,336,623)	2,638,459
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	$ 5,820,066	$ 6,139,839