Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Operating Activities
Net income	$ 50,712	$ 39,537
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization and accretion	13,644	11,867
Provision for loan losses	13,599	16,779
Deferred taxes	9,149	2,183
Net securities gains	(368)	(92)
Tax (benefit) expense of stock-based compensation	(373)	62
Net change in:
Interest receivable	348	1,312
Interest payable	(3,153)	(620)
Trading securities	331,972	110,490
Residential mortgage loans held for sale	(2,726)	2,778
Bank owned life insurance	(2,733)	(638)
Other, net	15,901	17,588
Net cash flows provided by operating activities	425,972	201,246
Investing Activities
Net change in loans	(107,351)	(226,196)
Securities available for sale:
Purchases	(610,783)	(138,672)
Sales	63,082	10,883
Maturities	259,981	162,150
Securities held to maturity:
Purchases	(427,756)	(299,545)
Sales	2,903
Maturities	150,069	117,207
Purchase of bank owned life insurance	(20,023)	(26)
Withdrawal/surrender of bank owned life insurance	20,701
Increase in premises and equipment	(8,104)	(6,843)
Net cash received in business combinations	203,538	23,375
Net cash flows used in investing activities	(473,743)	(357,667)
Net change in:
Non-interest bearing deposits, savings and NOW accounts	368,857	288,317
Time deposits	(192,535)	(79,887)
Short-term borrowings	70,276	(50,414)
Increase in long-term debt	13,591	37,592
Decrease in long-term debt	(169,618)	(17,864)
Increase (decrease) in junior subordinated debt	26	(95)
Net proceeds from issuance of common stock	4,381	66,148
Tax benefit (expense) of stock-based compensation	373	(62)
Cash dividends paid	(33,775)	(29,752)
Net cash flows provided by financing activities	61,576	213,983
Net Increase in Cash and Cash Equivalents	13,805	57,562
Cash and cash equivalents at beginning of period	208,953	131,571
Cash and Cash Equivalents at End of Period	$ 222,758	$ 189,133