Condensed Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Interest income:
Loans, including fees	$ 52,384	$ 39,777
Investment securities:
Taxable	2,161	2,036
Tax-exempt	1,206	195
Federal funds sold and securities purchased under agreements to resell	418	212
Total interest income	56,169	42,220
Interest expense:
Deposits	1,559	2,494
Federal funds purchased and securities sold under agreements to repurchase	136	126
Other borrowings	673	562
Total interest expense	2,368	3,182
Net interest income	53,801	39,038
Provision for loan losses	1,060	2,723
Net interest income after provision for loan losses	52,741	36,315
Noninterest income:
Service charges on deposit accounts	5,761	5,447
Bankcard services income	3,893	3,320
Mortgage banking income	3,395	1,830
Trust and investment services income	2,314	1,397
Amortization of FDIC indemnification assets, net	(7,171)	(3,233)
Other	1,331	712
Total noninterest income	9,523	9,473
Noninterest expense:
Salaries and employee benefits	23,252	18,048
Information services expense	3,192	2,468
OREO expense and loan related	3,102	2,716
Net occupancy expense	2,932	2,248
Furniture and equipment expense	2,572	2,239
Merger and conversion related expense	1,963	96
FDIC assessment and other regulatory charges	1,224	1,037
Bankcard expense	1,164	902
Amortization of intangibles	1,034	500
Advertising and marketing	842	757
Professional fees	691	633
Other	4,473	3,575
Total noninterest expense	46,441	35,219
Earnings:
Income before provision for income taxes	15,823	10,569
Provision for income taxes	5,174	3,541
Net income	$ 10,649	$ 7,028
Earnings per common share:
Basic (in dollars per share)	$ 0.64	$ 0.51
Diluted (in dollars per share)	$ 0.63	$ 0.50
Dividends per common share (in dollars per share)	$ 0.18	$ 0.17
Weighted-average common shares outstanding:
Basic (in shares)	16,769	13,883
Diluted (in shares)	16,936	13,951