Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating Activities:
Net income	$ 120,823	$ 39,267
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	71,870	71,616
Securities impairment	242	0
Amortization of intangibles	2,525	4,093
Accretion of discount, loan fees and purchase market adjustments, net	(29)	(12,524)
Net change in FDIC indemnification liability	96	4,710
Provision for loan losses	80,139	113,245
Amortization of stock based compensation	0	1,204
Net change in trading account assets	65,829	(272,999)
Net change in trading account liabilities	(40,247)	180,253
Net change in loans held for sale	30,687	(22,477)
Deferred tax benefit	28,504	11,991
Investment securities gains, net	0	(8,353)
Loss on sale of premises and equipment	1,446	1,346
Gain on sale of loans	0	(16,143)
Net loss (gain) on sale of other real estate and other assets	1,072	(1,232)
Increase in other assets	(147,103)	(188,806)
Increase (decrease) in other liabilities	4,928	(46,266)
Net cash provided by (used in) operating activities	220,782	(141,075)
Investing Activities:
Proceeds from sales of investment securities available for sale	0	561,488
Proceeds from prepayments, maturities and calls of investment securities available for sale	636,803	436,760
Purchases of investment securities available for sale	(797,095)	(1,126,225)
Proceeds from prepayments, maturities and calls of investment securities held to maturity	46,492	57,457
Purchases of investment securities held to maturity	(642)	(1,429)
Proceeds from sales of trading securities	228,980	173,678
Purchases of trading securities	(42,463)	(121,080)
Net change in loan portfolio	188,541	(1,591,797)
Proceeds from sales of loans	128,842	776,440
Purchase of premises and equipment	(22,086)	(25,015)
Proceeds from sale of premises and equipment	80	2,337
Payments to FDIC for covered assets	(1,091)	(124)
Proceeds from sales of other real estate owned	5,153	10,868
Net cash provided by (used in) investing activities	371,514	(846,642)
Financing Activities:
Net increase in demand deposits, NOW accounts and savings accounts	1,603,782	1,850,255
Net (decrease) increase in time deposits	(1,356,449)	1,084,078
Net increase in federal funds purchased and securities sold under agreements to repurchase	32,507	143,632
Net decrease in other short-term borrowings	(160,438)	(107,863)
Proceeds from FHLB and other borrowings	1,150,000	0
Repayment of FHLB and other borrowings	(1,150,050)	(1,100,125)
Capital contribution for non-controlling interest	46	0
Vesting of restricted stock	0	(6,175)
Preferred dividends paid	(3,548)	(3,219)
Net cash provided by financing activities	115,850	1,860,583
Net increase in cash and cash equivalents	708,146	872,866
Cash and cash equivalents at beginning of year	3,251,786	4,496,828
Cash and cash equivalents at end of period	$ 3,959,932	$ 5,369,694