Consolidated Statements Of Income (USD $)	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Interest and Dividend Income
Loans, including fees	$ 436,172,000		$ 353,228,000		$ 220,282,000
Mortgage loans held for sale, including fees	3,479,000		3,945,000		3,450,000
Investment securities:
Taxable interest	44,760,000		44,936,000		38,487,000
Tax-exempt interest	5,956,000		4,471,000		4,220,000
Accretion (Amortization) of FDIC loss share receivable	(72,086,000)		(13,024,000)		2,788,000
Other	2,046,000		2,815,000		1,160,000
Total interest and dividend income	420,327,000		396,371,000		270,387,000
Interest Expense
NOW and MMDA	28,914,000		43,247,000		25,333,000
Savings	656,000		1,542,000		1,161,000
Time deposits	40,984,000		50,968,000		49,189,000
Short-term borrowings	577,000		814,000		1,328,000
Long-term debt	10,938,000		18,173,000		20,591,000
Total interest expense	82,069,000		114,744,000		97,602,000
Net interest income	338,258,000		281,627,000		172,785,000
Provision for loan losses	25,867,000		42,451,000		45,370,000
Net interest income after provision for loan losses	312,391,000		239,176,000		127,415,000
Noninterest Income
Service charges on deposit accounts	25,915,000		24,375,000		22,986,000
ATM/debit card fee income	11,008,000		10,117,000		7,975,000
Income from bank owned life insurance	3,296,000		3,100,000		2,892,000
Gain on sale of loans, net	44,892,000		47,689,000		35,108,000
Gain (loss) on sale of assets	943,000		(76,000)		(644,000)
Gain on acquisition			3,781,000		238,893,000
Gain on sale of investments, net	3,475,000		5,251,000		6,736,000
(Losses) gains on swaps	(2,000)		3,000		202,000
Net cash settlements on swaps	(1,722,000)		(1,646,000)		(326,000)
Title revenue	18,048,000		18,083,000		18,476,000
Broker commissions	10,224,000		7,530,000		4,592,000
Other income	15,782,000		15,683,000		7,647,000
Total noninterest income	131,859,000		133,890,000		344,537,000
Noninterest Expense
Salaries and employee benefits	193,773,000		161,482,000		114,379,000
Occupancy and equipment	49,600,000		33,837,000		24,337,000
Franchise and shares tax	4,243,000		2,718,000		3,242,000
Communication and delivery	11,510,000		9,643,000		6,522,000
Marketing and business development	9,754,000		6,288,000		5,640,000
Data processing	14,531,000		12,133,000		6,922,000
Printing, stationery and supplies	3,298,000		2,987,000		2,411,000
Amortization of acquisition intangibles	5,121,000		4,935,000		2,893,000
Professional services	15,085,000		13,473,000		8,164,000
Goodwill impairment					9,681,000
Other expenses	66,816,000		56,753,000		39,069,000
Total noninterest expense	373,731,000		304,249,000		223,260,000
Income before income tax expense	70,519,000		68,817,000		248,692,000
Income tax expense	16,981,000		19,991,000		90,338,000
Net Income	53,538,000		48,826,000		158,354,000
Preferred Stock Dividends					(3,350,000)
Income Available to Common Shareholders - Basic	53,538,000		48,826,000		155,004,000
Earnings Allocated to Unvested Restricted Stock	(967,000)		(971,000)		(3,910,000)
Earnings Available to Common Shareholders - Diluted	$ 52,571,000		$ 47,855,000		$ 151,094,000
Earnings per common share - Basic	$ 1.88	[1]	$ 1.90	[1]	$ 8.49	[1]
Earnings per common share - Diluted	$ 1.87		$ 1.88		$ 8.41
Cash dividends declared per common share	$ 1.36		$ 1.36		$ 1.36

[1] Total earnings available to common shareholders include distributed earnings of $38,681,000, or $1.38 per weighted average share, and undistributed earnings of $13,869,000, or $0.50 per weighted average share for the year ended December 31, 2011. Total earnings available to common shareholders include distributed earnings of $35,772,000, or $1.42 per weighted average share, and undistributed earnings of $12,073,000, or $0.48 per weighted average share for the year ended December 31, 2010. Total earnings available to common shareholders include distributed earnings of $24,491,000, or $1.38 per weighted average share, and undistributed earnings of $126,296,000, or $7.11 per weighted average share for the year ended December 31, 2009.