Condensed Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Interest income:
Loans, including fees	$ 78,678	$ 46,179	$ 184,879	$ 128,076
Investment securities:
Taxable	3,315	2,893	7,572	7,800
Tax-exempt	1,202	181	3,582	576
Federal funds sold and securities purchased under agreements to resell	505	282	1,366	773
Total interest income	83,700	49,535	197,399	137,225
Interest expense:
Deposits	2,698	1,970	5,721	6,736
Federal funds purchased and securities sold under agreements to repurchase	92	105	343	341
Other borrowings	1,239	550	2,579	1,666
Total interest expense	4,029	2,625	8,643	8,743
Net interest income	79,671	46,910	188,756	128,482
Provision for loan losses	659	4,044	1,898	11,408
Net interest income after provision for loan losses	79,012	42,866	186,858	117,074
Noninterest income:
Service charges on deposit accounts	8,966	6,169	20,463	17,501
Bankcard services income	6,493	3,570	14,631	10,508
Mortgage banking income	1,342	3,496	6,619	8,365
Trust and investment services income	3,593	1,577	8,345	4,617
Securities gains				61
Amortization of FDIC indemnification assets, net	(7,625)	(6,623)	(22,106)	(14,226)
Other	2,496	977	5,321	3,557
Total noninterest income	15,265	9,166	33,273	30,383
Noninterest expense:
Salaries and employee benefits	34,464	18,647	81,462	54,957
Information services expense	3,827	2,662	10,011	8,032
OREO expense and loan related	3,461	3,951	9,383	8,782
Net occupancy expense	5,046	2,981	11,663	8,660
Furniture and equipment expense	3,523	2,165	8,306	6,775
Merger and conversion related expense	10,397	568	13,220	2,662
FDIC assessment and other regulatory charges	1,521	878	3,841	2,988
Bankcard expense	1,752	1,057	4,152	3,077
Amortization of intangibles	1,738	566	3,794	1,606
Advertising and marketing	1,150	736	2,640	2,046
Professional fees	1,377	643	2,828	2,008
Other	7,163	3,177	15,445	9,167
Total noninterest expense	75,419	38,031	166,745	110,760
Earnings:
Income before provision for income taxes	18,858	14,001	53,386	36,697
Provision for income taxes	6,804	4,938	18,151	12,576
Net income	12,054	9,063	35,235	24,121
Preferred stock dividends	542		542
Net income available to common shareholders	$ 11,512	$ 9,063	$ 34,693	$ 24,121
Earnings per common share:
Basic (in dollars per share)	$ 0.53	$ 0.61	$ 1.87	$ 1.67
Diluted (in dollars per share)	$ 0.52	$ 0.60	$ 1.85	$ 1.66
Dividends per common share (in dollars per share)	$ 0.19	$ 0.17	$ 0.55	$ 0.51
Weighted-average common shares outstanding:
Basic (in shares)	21,894	14,920	18,518	14,484
Diluted (in shares)	22,128	15,043	18,717	14,573