Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Operating Activities
Net income	$ 89,365	$ 81,455
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization and accretion	21,845	21,989
Provision for loan losses	22,724	22,028
Deferred tax expenses	12,246	29,549
Net securities gains	(757)	(302)
Other-than-temporary impairment losses on securities		119
Tax benefit of stock-based compensation	(1,278)	(385)
Net change in:
Interest receivable	(1,568)	(3,248)
Interest payable	(2,836)	(3,506)
Trading securities	88,052	331,972
Residential mortgage loans held for sale	19,647	(7,300)
Bank owned life insurance	(1,808)	(4,475)
Other, net	18,610	12,036
Net cash flows provided by operating activities	264,242	479,932
Investing Activities
Net change in loans	(473,933)	(238,978)
Securities available for sale:
Purchases	(250,724)	(780,185)
Sales	21,919	87,101
Maturities	269,330	367,025
Securities held to maturity:
Purchases	(335,533)	(468,780)
Sales	17,429	2,903
Maturities	239,942	240,059
Purchase of bank owned life insurance	(10,016)	(20,024)
Withdrawal/surrender of bank owned life insurance		20,701
Increase in premises and equipment	(7,745)	(7,940)
Net cash received in business combinations	41,986	203,538
Net cash flows used in investing activities	(487,345)	(594,580)
Financing Activities
Non-interest bearing deposits, savings and NOW accounts	536,442	567,788
Time deposits	(240,111)	(249,764)
Short-term borrowings	68,643	155,177
Increase in long-term debt	37,602	26,961
Decrease in long-term debt	(73,867)	(183,139)
Decrease in junior subordinated debt	(15,000)
Net proceeds from issuance of common stock	4,609	6,586
Tax benefit of stock-based compensation	1,278	385
Cash dividends paid	(52,028)	(50,705)
Net cash flows provided by financing activities	267,568	273,289
Net Increase in Cash and Cash Equivalents	44,465	158,641
Cash and cash equivalents at beginning of period	239,044	208,953
Cash and Cash Equivalents at End of Period	$ 283,509	$ 367,594