Condensed Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
INTEREST INCOME:
Interest and fees on loans	$ 110,437	$ 67,630	$ 65,588
Taxable interest on investment securities	7,328	1,918	2,195
Nontaxable interest on investment securities	2,886	1,539	1,097
Interest and dividends on other interest earning assets	455	341	229
Total interest income	121,106	71,428	69,109
INTEREST EXPENSE:
Deposits	5,150	3,673	4,469
Junior subordinated debentures	458	0	0
Other borrowings	73	51	65
Total interest expense	5,681	3,724	4,534
Net interest income	115,425	67,704	64,575
Provision for loan losses	4,594	3,672	2,016
Net interest income after provision for loan losses	110,831	64,032	62,559
NONINTEREST INCOME:
Bargain purchase gain on bank acquisition	0	399	0
Service charges and other fees	11,143	5,936	5,516
Merchant Visa income, net	1,076	862	685
Change in FDIC indemnification asset	(2,543)	(181)	(1,033)
Gain on sale of investment securities, net	287	0	0
Gain on sale of loans, net	1,518	142	295
Other income	4,986	2,493	1,809
Total noninterest income	16,467	9,651	7,272
NONINTEREST EXPENSE:
Compensation and employee benefits	52,634	31,612	29,020
Occupancy and equipment	13,406	9,724	7,365
Data processing	9,243	4,806	2,555
Marketing	2,502	1,598	1,517
Professional services	6,185	3,936	2,543
State and local taxes	1,976	1,150	1,226
Impairment loss on investment of securities, net	45	38	78
Federal deposit insurance premium	1,718	1,001	1,002
Other real estate owned, net	638	309	316
Amortization of intangible assets	1,920	543	427
Other expense	9,112	4,798	4,343
Total noninterest expense	99,379	59,515	50,392
Income before income taxes	27,919	14,168	19,439
Income tax expense	6,905	4,593	6,178
Net income	21,014	9,575	13,261
Basic earnings per common share (in usd per share)	$ 0.82	$ 0.61	$ 0.87
Diluted earnings per common share (in usd per share)	$ 0.82	$ 0.61	$ 0.87
Dividends declared per common share (in usd per share)	$ 0.50	$ 0.42	$ 0.80
Noncovered Loans
INTEREST EXPENSE:
Provision for loan losses	2,232	1,784	1,570
Covered Loans
INTEREST EXPENSE:
Provision for loan losses	$ 2,362	$ 1,888	$ 446