Condensed Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Interest income:
Loans, including fees	$ 78,700	$ 78,771	$ 239,988	$ 184,974
Investment securities:
Taxable	3,982	3,315	11,860	7,572
Tax-exempt	1,236	1,202	3,463	3,582
Federal funds sold and securities purchased under agreements to resell	430	505	1,331	1,366
Total interest income	84,348	83,793	256,642	197,494
Interest expense:
Deposits	2,395	2,711	7,056	5,733
Federal funds purchased and securities sold under agreements to repurchase	87	92	277	343
Other borrowings	1,497	1,235	4,500	2,572
Total interest expense	3,979	4,038	11,833	8,648
Net interest income	80,369	79,755	244,809	188,846
Provision for loan losses	2,091	659	5,109	1,898
Net interest income after provision for loan losses	78,278	79,096	239,700	186,948
Noninterest income:
Service charges on deposit accounts	9,126	8,966	27,258	20,462
Bankcard services income	7,489	6,476	22,314	14,614
Trust and investment services income	4,490	3,593	13,845	8,345
Mortgage banking income	4,124	1,342	12,098	6,629
Securities gains	(90)		(2)
Amortization of FDIC indemnification assets, net	(4,825)	(7,625)	(17,718)	(22,106)
Other	4,139	2,418	11,602	5,229
Total noninterest income	24,453	15,170	69,397	33,173
Noninterest expense:
Salaries and employee benefits	40,029	34,463	119,398	81,461
Merger and branding related expense	6,846	10,397	19,341	13,220
Net occupancy expense	5,387	5,079	16,758	11,696
Information services expense	3,417	3,905	12,154	10,088
Furniture and equipment expense	3,166	3,513	10,171	8,296
Bankcard expense	2,141	1,865	6,520	4,264
Amortization of intangibles	2,080	1,738	6,268	3,794
OREO expense and loan related	3,374	3,461	9,313	9,383
FDIC assessment and other regulatory charges	1,268	1,521	4,111	3,841
Professional fees	1,068	1,329	3,501	2,780
Advertising and marketing	837	1,313	2,984	2,803
Other	5,445	6,824	17,843	15,109
Total noninterest expense	75,058	75,408	228,362	166,735
Earnings:
Income before provision for income taxes	27,673	18,858	80,735	53,386
Provision for income taxes	8,346	6,804	26,546	18,151
Net income	19,327	12,054	54,189	35,235
Preferred stock dividends		542	1,073	542
Net income available to common shareholders	$ 19,327	$ 11,512	$ 53,116	$ 34,693
Earnings per common share:
Basic (in dollars per share)	$ 0.81	$ 0.53	$ 2.22	$ 1.87
Diluted (in dollars per share)	$ 0.80	$ 0.52	$ 2.20	$ 1.85
Dividends per common share (in dollars per share)	$ 0.21	$ 0.19	$ 0.60	$ 0.55
Weighted-average common shares outstanding:
Basic (in shares)	23,899	21,894	23,890	18,518
Diluted (in shares)	24,160	22,128	24,139	18,717