Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
OPERATING ACTIVITIES
Net income	$ 210,386	$ 138,562	$ 166,869
Adjustments to reconcile net income to cash provided by operating activities:
Provision for loan and lease losses	20,664	640	(32,255)
Deferred tax expense (benefit)	550	(33,339)	47,646
Change in current taxes payable	(19,477)	72,274	(79,173)
Depreciation	87,717	75,481	70,841
Change in accrued interest payable	(2,481)	1,457	(2,616)
Change in income earned not collected	(12,782)	6,402	(724)
Business Combination, Bargain Purchase, Gain Recognized, Amount	(42,930)	0	0
Gain (Loss) on Disposition of Business	(216)	0	0
Gain on sale of other assets	0	0	(4,085)
Securities losses (gains)	(10,817)	(29,096)	0
Origination of loans held for sale	(685,631)	(377,993)	(393,908)
Proceeds from sale of loans held for sale	701,412	398,719	443,708
Gain on sale of loans	(11,851)	(4,971)	(10,738)
Loss on sale of other real estate	2,168	14,275	6,686
Gain on elimination of acquired debt	0	(1,988)	0
Net amortization of premiums and discounts	(85,066)	(48,374)	(112,759)
Amortization of intangible assets	22,894	6,955	2,309
FDIC receivable for loss share agreements	47,044	27,666	71,771
FDIC payable for loss share agreements	9,918	6,933	7,821
Net change in other assets	(12,904)	(72,680)	100,437
Net change in other liabilities	14,458	1,319	49,177
Net cash provided by operating activities	233,056	182,242	331,007
INVESTING ACTIVITIES
Net change in loans outstanding	(1,311,447)	(814,372)	323,436
Purchases of investment securities available for sale	(2,467,993)	(2,518,680)	(2,671,420)
Proceeds from maturities of investment securities held to maturity	263	389	435
Proceeds from maturities of investment securities available for sale	1,478,608	2,482,722	2,437,851
Proceeds from sales of investment securities available for sale	1,286,120	422,652	0
Net change in overnight investments	(338,213)	221,730	(416,144)
Cash (paid to) received from the FDIC for loss share agreements	(33,296)	(1,286)	19,373
Proceeds from Sale of Other Real Estate	80,932	89,485	147,550
Proceeds from Sale of Loans Held-for-investment	45,862	0	0
Additions to premises and equipment	(89,734)	(82,708)	(66,037)
Business acquisition, net of cash acquired	123,137	182,370	0
Net Cash Used in Divestiture of Businesses	(22,242)	0	0
Net cash (used) provided by investing activities	(1,248,003)	(17,698)	(224,956)
FINANCING ACTIVITIES
Net change in time deposits	(590,773)	(499,869)	(699,005)
Net change in demand and other interest-bearing deposits	1,607,487	497,692	487,046
Net change in short-term borrowings	(397,952)	(25,321)	(57,087)
Repayment of long-term obligations	(5,896)	(54,301)	(4,152)
Origination of long-term obligations	350,000	0	70,000
Stock issuance costs	0	(619)	0
Repurchase of common stock	0	0	(321)
Cash dividends paid	(18,015)	(11,543)	(8,663)
Net cash provided (used) by financing activities	944,851	(93,961)	(212,182)
Change in cash and due from banks	(70,096)	70,583	(106,131)
Cash and due from banks at beginning of period	604,182	533,599	639,730
Cash and due from banks at end of period	534,086	604,182	533,599
CASH PAYMENTS FOR:
Interest	46,785	48,894	59,234
Income taxes	136,900	127,970	102,890
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Transfers of loans to other real estate	55,032	65,956	92,125
Dividends declared but not paid	0	3,603	2,885
Reclassification of reserve for unfunded commitments to allowance for loans and leases	0	0	7,368	[1]
Repurchase and retirement of common stock	0	(46,085)	0
Issuance of common stock associated with Bancorporation merger	$ 0	$ 564,248	$ 0

[1] Reclassification results from enhancements to the ALLL calculation during the second quarter of 2013 that resulted in the allocation of $15.8 million previously designated as 'nonspecific' to other loan classes and the absorption of $7.4 million of the reserve for unfunded commitments related to unfunded, revocable loan commitments into the ALLL. Further discussion is contained in Note A.