Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
OPERATING ACTIVITIES
Net income	$ 52,072	$ 67,158
Adjustments to reconcile net income to cash provided by operating activities:
Provision (credit) for loan and lease losses	4,843	5,792
Deferred tax expense (benefit)	(8,806)	(10,203)
Net change in current taxes	35,678	15,437
Depreciation	22,053	21,965
Increase (decrease) in accrued interest payable	324	176
Net (increase) decrease in income earned not collected	(3,482)	(5,988)
Gain on acquisition	(1,704)	(42,930)
Securities (gains) losses	(4,628)	(5,126)
Origination of loans held for sale	(144,895)	(126,547)
Proceeds from sale of loans held for sale	140,160	127,203
Gain on sale of loans	(2,487)	(3,468)
Net writedowns/losses on other real estate	2,599	1,978
Net amortization of premiums and discounts	(12,201)	(17,150)
Amortization of intangible assets	5,586	5,206
FDIC receivable for loss share agreements	4,076	8,092
FDIC payable for loss share agreements	1,790	2,110
Net change in other assets	(19,678)	15,223
Net change in other liabilities	3,857	3,804
Net cash provided by operating activities	75,157	62,732
INVESTING ACTIVITIES
Net change in loans outstanding	(131,923)	(168,341)
Purchases of investment securities available for sale	(1,139,933)	(626,268)
Proceeds from maturities of investment securities held to maturity	61	77
Proceeds from maturities of investment securities available for sale	396,211	330,500
Proceeds from sales of investment securities available for sale	987,260	481,708
Net change in overnight investments	(805,699)	(734,004)
Cash (paid to) received from the FDIC for loss share agreements	(9,871)	(5,762)
Proceeds from sale of other real estate	8,202	22,794
Additions to premises and equipment	(13,595)	(13,177)
Business acquisition, net cash acquired	14,745	123,137
Net cash (used) provided by investing activities	(694,542)	(589,336)
FINANCING ACTIVITIES
Net change in time deposits	(84,802)	(189,906)
Net change in demand and other interest-bearing deposits	460,086	545,807
Net change in short-term borrowings	92,841	(50,835)
Repayment of long-term obligations	(68)	(3,140)
Origination of long-term obligations	75,000	120,000
Cash dividends paid	0	(3,603)
Net cash provided (used) by financing activities	543,057	418,323
Change in cash and due from banks	(76,328)	(108,281)
Cash and due from banks at beginning of period	534,086	604,182
Cash and due from banks at end of period	457,758	495,901
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Transfers of loans to other real estate	9,980	21,300
Dividends Declared but not Paid	$ 3,603	$ 3,603