Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating Activities:
Net income	$ 34,478	$ 141,767
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	71,469	69,595
Securities impairment	0	285
Amortization of intangibles	4,093	10,687
Accretion of discount, loan fees and purchase market adjustments, net	(12,524)	(53,747)
Net change in FDIC indemnification liability	4,710	28,789
Provision for loan losses	113,245	42,031
Amortization of stock based compensation	1,204	548
Net change in trading account assets	(272,999)	(191,826)
Net change in trading account liabilities	180,253	76,217
Net change in loans held for sale	(22,477)	(43,672)
Deferred tax expense	11,991	32,676
Investment securities gains, net	(8,353)	(32,832)
Loss on prepayment of FHLB and other borrowings, net	0	2,549
Loss on sale of premises and equipment	1,346	1,627
(Gain) loss on sale of loans	(16,143)	2
Net gain on sale of other real estate and other assets	(1,232)	(134)
(Increase) decrease in other assets	(204,879)	132,983
Decrease in other liabilities	(35,189)	(372,520)
Net cash used in operating activities	(151,007)	(154,975)
Investing Activities:
Proceeds from sales of investment securities available for sale	561,488	1,147,705
Proceeds from prepayments, maturities and calls of investment securities available for sale	436,760	349,624
Purchases of investment securities available for sale	(1,126,225)	(1,316,531)
Proceeds from prepayments, maturities and calls of investment securities held to maturity	57,457	28,700
Purchases of investment securities held to maturity	(1,429)	(50,632)
Proceeds from sales of trading securities	173,678	1,292,110
Purchases of trading securities	(121,080)	(1,946,314)
Net change in loan portfolio	(1,591,797)	(1,160,570)
Purchase of premises and equipment	(24,639)	(28,831)
Proceeds from sale of premises and equipment	2,337	778
Proceeds from sales of loans	776,440	6
Reimbursements from (payments to) FDIC for covered assets	(124)	908
Proceeds from sales of other real estate owned	10,868	5,688
Net cash used in investing activities	(846,266)	(1,677,359)
Financing Activities:
Net increase in demand deposits, NOW accounts and savings accounts	1,878,886	1,793,161
Net increase (decrease) in time deposits	1,084,078	(86,419)
Net increase (decrease) in federal funds purchased and securities sold under agreements to repurchase	143,632	(219,820)
Net (decrease) increase in other short-term borrowings	(107,863)	831,970
Proceeds from FHLB and other borrowings	0	500,000
Repayment of FHLB and other borrowings	(1,100,125)	(402,944)
Vesting of restricted stock	(6,175)	(7,662)
Preferred dividends paid	(3,219)	0
Net cash provided by financing activities	1,889,214	2,408,286
Net increase in cash and cash equivalents	891,941	575,952
Cash and cash equivalents at beginning of year	4,452,892	3,388,405
Cash and cash equivalents at end of period	$ 5,344,833	$ 3,964,357