Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
OPERATING ACTIVITIES
Net income	$ 172,792	$ 167,638
Adjustments to reconcile net income to cash provided by operating activities:
Provision (credit) for loan and lease losses	16,912	13,618
Deferred tax expense (benefit)	(13,328)	(3,941)
Net change in current taxes	(16,906)	(26,195)
Depreciation	66,400	65,559
Increase (decrease) in accrued interest payable	(1,662)	(2,244)
Net (increase) decrease in income earned not collected	(2,899)	(10,114)
Gain on acquisition	(5,831)	(42,930)
Securities (gains) losses	(17,509)	(10,837)
Loss on termination of FDIC loss share agreements	3,377	0
Origination of loans held for sale	(589,313)	(542,836)
Proceeds from sale of loans held for sale	564,026	540,737
Gain on sale of loans	(10,857)	(6,079)
Gain (Loss) on Sale of Loans and Leases	(3,758)	0
Net writedowns/losses on other real estate	5,251	4,355
Net amortization of premiums and discounts	(32,924)	(70,150)
Amortization of intangible assets	16,633	11,765
FDIC receivable for loss share agreements	11,926	35,395
FDIC payable for loss share agreements	(12,474)	7,503
Net change in other assets	17,120	29,225
Net change in other liabilities	56,275	37,077
Net cash provided by operating activities	223,251	197,546
INVESTING ACTIVITIES
Net change in loans outstanding	(782,771)	(928,132)
Purchases of investment securities available for sale	(2,382,141)	(1,887,604)
Proceeds from maturities of investment securities held to maturity	130	217
Proceeds from maturities of investment securities available for sale	1,213,333	1,139,053
Proceeds from sales of investment securities available for sale	1,802,155	1,036,254
Net change in overnight investments	(891,059)	(643,213)
Proceeds from sales of loans	77,665	45,862
Cash (paid to) received from the FDIC for loss share agreements	(16,701)	(24,805)
Net Payment to the FDIC for Termination of Loss Share Agreements	(20,115)	0
Proceeds from sale of other real estate	24,406	63,446
Additions to premises and equipment	(60,982)	(55,575)
Business acquisitions, net of cash acquired	(727)	123,137
Net cash (used) provided by investing activities	(1,036,807)	(1,131,360)
FINANCING ACTIVITIES
Net change in time deposits	(235,164)	(405,160)
Net change in demand and other interest-bearing deposits	781,382	1,179,606
Net change in short-term borrowings	93,655	(232,928)
Repayment of long-term obligations	(3,889)	(4,633)
Origination of long-term obligations	150,000	350,000
Cash dividends paid	(10,809)	(10,809)
Net cash provided (used) by financing activities	775,175	876,076
Change in cash and due from banks	(38,381)	(57,738)
Cash and due from banks at beginning of period	534,086	604,182
Cash and due from banks at end of period	495,705	546,444
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Transfers of loans to other real estate	31,517	44,065
Dividends Declared but not Paid	0	3,603
Unsettled sales of investment securities	$ 0	$ 236,617