Consolidated Statements Of Cash Flows (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash Flows from Operating Activities
Net income	$ 53,538,000	$ 48,826,000	$ 158,354,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	16,772,000	11,042,000	10,377,000
Amortization of purchase accounting adjustments	(30,653,000)	(52,850,000)	(7,051,000)
Provision for loan losses	25,867,000	42,451,000	45,370,000
Noncash compensation expense	9,114,000	7,797,000	6,586,000
(Gain) loss on sale of assets	(943,000)	76,000	644,000
Loss on impaired securities	509,000	517,000
Gain on sale of investments	(3,475,000)	(5,251,000)	(6,736,000)
Gain on sale of OREO	(1,476,000)	(2,524,000)	(10,000)
Gain on acquisition		(3,781,000)	(238,893,000)
Goodwill impairment			9,681,000
Loss on abandonment of fixed assets			154,000
Amortization of premium/discount on investments	18,233,000	15,050,000	3,719,000
Derivative losses (gains) on swaps	2,000	(3,000)	(198,000)
(Benefit) provision for deferred income taxes	(11,750,000)	(3,607,000)	82,297,000
Mortgage loans held for sale
Originations	(1,662,611,000)	(1,772,486,000)	(1,587,095,000)
Proceeds from sales	1,641,780,000	1,803,214,000	1,618,761,000
Gain on sale of loans, net	(44,892,000)	(47,689,000)	(35,108,000)
Cash retained from tax benefit associated with share-based payment arrangements	(1,454,000)	(637,000)	(1,346,000)
(Increase) decrease in other assets	(51,549,000)	163,741,000	(207,687,000)
Other operating activities, net	1,625,000	(54,162,000)	25,225,000
Net Cash (Used in) Provided by Operating Activities	(41,363,000)	149,724,000	(122,956,000)
Cash Flows from Investing Activities
Proceeds from sales of securities available for sale	130,305,000	249,008,000	338,096,000
Proceeds from maturities, prepayments and calls of securities available for sale	626,004,000	576,139,000	413,221,000
Purchases of securities available for sale	(499,899,000)	(1,198,853,000)	(944,914,000)
Proceeds from maturities, prepayments and calls of securities held to maturity	120,075,000	66,091,000	349,019,000
Purchases of securities held to maturity	(22,803,000)	(96,375,000)	(548,647,000)
FDIC reimbursement of recoverable covered asset losses	139,852,000	438,870,000
Increase in loans receivable, net, excluding loans acquired	(503,514,000)	(58,373,000)	(344,310,000)
Proceeds from sale of premises and equipment	3,227,000	1,324,000	70,000
Purchases of premises and equipment	(44,055,000)	(38,063,000)	(16,212,000)
Proceeds from disposition of real estate owned	61,713,000	49,072,000	15,011,000
Investment in new market tax credit entities	(9,425,000)	(11,875,000)	(104,200,000)
Cash received in excess of cash paid for acquisition	79,288,000	24,134,000	496,015,000
Other investing activities, net	2,085,000	6,518,000	814,000
Net Cash Provided by (Used in) Investing Activities	82,853,000	7,617,000	(346,037,000)
Cash Flows from Financing Activities
Increase in deposits, net of deposits acquired	174,809,000	87,498,000	529,415,000
Net change in short-term borrowings, net of borrowings acquired	136,786,000	(43,023,000)	42,561,000
Proceeds from long-term debt	3,176,000	45,233,000	53,531,000
Repayments of long-term debt	(47,227,000)	(380,004,000)	(380,659,000)
Dividends paid to shareholders	(38,558,000)	(34,412,000)	(23,355,000)
Preferred stock dividend paid			(3,350,000)
Proceeds from sale of treasury stock for stock options exercised	6,807,000	1,631,000	4,449,000
Payments to repurchase common stock	(43,219,000)	(1,500,000)	(979,000)
Preferred stock issued and common stock warrants			(87,878,000)
Common stock issued		328,980,000	164,644,000
Redemption of preferred stock warrant			(1,200,000)
Cash retained from tax benefit associated with share-based payment arrangements	1,454,000	637,000	1,346,000
Net Cash Provided by Financing Activities	194,028,000	5,040,000	298,525,000
Net Increase (Decrease) In Cash and Cash Equivalents	235,518,000	162,381,000	(170,468,000)
Cash and Cash Equivalents at Beginning of Period	337,778,000	175,397,000	345,865,000
Cash and Cash Equivalents at End of Period	573,296,000	337,778,000	175,397,000
Supplemental Schedule of Noncash Activities
Acquisition of real estate in settlement of loans	104,855,000	49,886,000	19,254,000
Common stock issued in acquisition	181,140,000
Transfers of property into Other Real Estate	104,855,000	49,886,000	20,575,000
Exercise of stock options with payment in company stock			290,000
Supplemental Disclosures
Interest on deposits and borrowings	84,452,000	117,810,000	104,228,000
Income taxes, net	$ 41,594,000	$ 24,494,000	$ 17,127,000