Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Interest income:
Loans, including fees	$ 268,503	$ 174,807	$ 162,205
Investment securities:
Taxable	11,073	7,577	7,641
Tax-exempt	4,773	3,947	854
Federal funds sold and securities purchased under agreements to resell	1,906	1,157	1,018
Total interest income	286,255	187,488	171,718
Interest expense:
Deposits	8,467	8,424	17,557
Federal funds purchased and securities sold under agreements to repurchase	426	451	527
Other borrowings	4,109	2,219	2,182
Total interest expense	13,002	11,094	20,266
Net interest income	273,253	176,394	151,452
Provision for loan losses	1,886	13,619	30,236
Net interest income after provision for loan losses	271,367	162,775	121,216
Noninterest income:
Service charges on deposit accounts	30,561	23,815	22,654
Bankcard services income	21,883	14,173	11,721
Trust and investment services income	12,661	6,360	5,464
Mortgage banking income	9,108	12,545	6,271
Securities gains, net		189	323
Total other-than-temporary impairment losses			(115)
Portion of impairment losses recognized in other comprehensive income	0
Net impairment losses recognized in earnings			(115)
Gains on acquisitions			16,529
Accretion (amortization) of FDIC indemnification asset	(29,535)	(20,773)	(10,135)
Other	9,170	4,974	2,407
Total noninterest income	53,848	41,283	55,119
Noninterest expense:
Salaries and employee benefits	122,096	76,308	68,937
Merger expense	22,534	10,214	3,198
Net occupancy expense	17,518	11,608	9,674
Information services expense	14,334	11,092	10,512
OREO expense and loan related	13,758	12,003	14,051
Furniture and equipment expense	12,130	9,115	8,476
Bankcard expense	6,435	4,062	3,241
Amortization of intangibles	6,081	2,172	1,991
FDIC assessment and other regulatory charges	5,034	3,875	4,573
Professional fees	4,337	2,681	1,776
Advertising and marketing	3,941	2,735	2,729
Other	22,443	13,033	13,820
Total noninterest expense	250,641	158,898	142,978
Earnings:
Income before provision for income taxes	74,574	45,160	33,357
Provision for income taxes	25,355	15,128	10,762
Net income	49,219	30,032	22,595
Preferred stock dividends	1,354
Net income available to common shareholders	$ 47,865	$ 30,032	$ 22,595
Earnings per common share:
Basic (in dollars per share)	$ 2.41	$ 2.04	$ 1.65
Diluted (in dollars per share)	$ 2.38	$ 2.03	$ 1.63
Dividends per common share (in dollars per share)	$ 0.74	$ 0.69	$ 0.68
Weighted average common shares outstanding:
Basic (in shares)	19,866	14,698	13,677
Diluted (in shares)	20,077	14,796	13,751