Condensed Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Interest income:
Loans, including fees	$ 46,179	$ 42,912	$ 128,076	$ 120,735
Investment securities:
Taxable	2,893	2,023	7,800	5,621
Tax-exempt	181	211	576	662
Federal funds sold and securities purchased under agreements to resell	282	161	773	875
Total interest income	49,535	45,307	137,225	127,893
Interest expense:
Deposits	1,970	3,958	6,736	14,335
Federal funds purchased and securities sold under agreements to repurchase	105	118	341	420
Other borrowings	550	551	1,666	1,611
Total interest expense	2,625	4,627	8,743	16,366
Net interest income	46,910	40,680	128,482	111,527
Provision for loan losses	4,044	8,323	11,408	23,179
Net interest income after provision for loan losses	42,866	32,357	117,074	88,348
Noninterest income:
Service charges on deposit accounts	6,169	6,050	17,501	16,695
Bankcard services income	3,570	2,980	10,508	8,684
Mortgage banking income	3,526	2,341	8,408	4,329
Trust and investment services income	1,577	1,453	4,617	4,227
Securities gains			61	333
Amortization of FDIC indemnification assets, net	(6,623)	(3,515)	(14,226)	(7,049)
Gains on acquisitions		11,001		16,529
Other	947	481	3,514	1,708
Total noninterest income	9,166	20,791	30,383	45,456
Noninterest expense:
Salaries and employee benefits	18,647	17,345	54,957	52,007
OREO expense and loan related	3,951	4,118	8,782	9,428
Information services expense	2,662	2,851	8,032	7,696
Net occupancy expense	2,621	2,443	7,347	7,365
Furniture and equipment expense	2,165	2,127	6,775	6,266
FDIC assessment and other regulatory charges	878	859	2,988	3,593
Advertising and marketing	736	824	2,046	2,022
Professional fees	643	377	2,008	1,311
Merger and conversion related expense	568	1,587	2,662	2,794
Amortization of intangibles	566	517	1,606	1,468
Other	4,594	4,110	13,556	12,480
Total noninterest expense	38,031	37,158	110,759	106,430
Earnings:
Income before provision for income taxes	14,001	15,990	36,698	27,374
Provision for income taxes	4,938	5,658	12,576	9,608
Net income	$ 9,063	$ 10,332	$ 24,122	$ 17,766
Earnings per common share:
Basic (in dollars per share)	$ 0.61	$ 0.75	$ 1.67	$ 1.30
Diluted (in dollars per share)	$ 0.60	$ 0.74	$ 1.66	$ 1.28
Dividends per common share (in dollars per share)	$ 0.17	$ 0.17	$ 0.51	$ 0.51
Weighted-average common shares outstanding:
Basic (in shares)	14,920	13,818	14,484	13,613
Diluted (in shares)	15,043	13,884	14,573	13,689