Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Interest income:
Loans, including fees	$ 668,387	$ 499,721	$ 284,922
Securities-taxable	86,402	84,321	60,653
Securities-tax exempt	5,841	6,031	5,232
Federal funds sold and other short term investments	1,919	2,131	1,751
Total interest income	762,549	592,204	352,558
Interest expense:
Deposits	32,741	55,691	72,903
Short-term borrowings	6,005	7,034	9,306
Long-term debt and other interest expense	12,936	8,246	136
Total interest expense	51,682	70,971	82,345
Net interest income	710,867	521,233	270,213
Provision for loan losses	54,192	38,732	65,991
Net interest income after provision for loan losses	656,675	482,501	204,222
Noninterest income:
Service charges on deposit accounts	78,246	55,265	45,335
Trust fees	32,736	23,940	16,715
Bank card fees	31,698	28,879	14,941
Investment and annuity fees	18,033	15,016	10,181
ATM fees	17,414	14,052	9,486
Secondary mortgage market operations	16,488	10,484	8,915
Insurance commissions and fees	15,692	16,524	14,461
Accretion of FDIC loss share receivable	5,000	16,689	4,890
Other income	36,888	25,578	12,025
Securities gains (losses), net	1,552	(91)
Total noninterest income	253,747	206,336	136,949
Noninterest expense:
Compensation expense	293,783	234,071	112,478
Employee benefits	72,401	52,531	29,564
Salaries and employee benefits	366,184	286,602	142,042
Net occupancy expense	54,467	43,220	23,803
Equipment expense	24,097	17,524	10,569
Data processing expense	49,935	43,069	23,646
Professional services expense	57,457	69,931	16,447
Amortization of intangibles	32,067	16,551	2,728
Telecommunications and postage	21,437	18,514	11,019
Deposit insurance and regulatory fees	14,902	12,980	11,401
Other real estate owned expense, net	13,866	6,910	4,475
Other expense	78,655	78,713	33,130
Total noninterest expense	713,067	594,014	279,260
Income before income taxes	197,355	94,823	61,911
Income taxes	45,613	18,064	9,705
Net income	$ 151,742	$ 76,759	$ 52,206
Basic earnings per common share	$ 1.77	$ 1.16	$ 1.41
Diluted earnings per common share	$ 1.75	$ 1.15	$ 1.40