Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Interest income
Loans	$ 236,262	$ 199,844	$ 158,947
Securities
Taxable	17,026	17,096	13,397
Tax-exempt	9,520	9,073	8,012
Other	215	396	248
Total interest income	263,023	226,409	180,604
Interest expense
Deposits	13,715	16,216	17,118
Borrowings	7,950	7,711	6,353
Total interest expense	21,665	23,927	23,471
Net interest income	241,358	202,482	157,133
Provision for loan losses	4,750	6,167	10,350
Net interest income after provision for loan losses	236,608	196,315	146,783
Noninterest income
Service charges on deposit accounts	29,269	26,756	21,559
Fees and commissions	16,091	14,231	11,675
Insurance commissions	8,423	8,194	4,976
Wealth management revenue	9,808	8,545	7,574
Mortgage banking income	35,815	14,862	18,835
Net gains on sales of securities	96	375	54
BOLI income	3,612	2,985	4,085
Other	5,156	4,561	3,133
Total noninterest income	108,270	80,509	71,891
Noninterest expense
Salaries and employee benefits	145,111	115,108	98,780
Data processing	14,046	11,400	8,870
Net occupancy and equipment	26,987	20,252	16,957
Other real estate owned	3,045	4,593	6,966
Professional fees	4,384	4,485	5,540
Advertising and public relations	6,112	5,923	5,630
Intangible amortization	6,069	5,606	2,869
Communications	7,278	5,949	4,777
Merger-related expenses	11,614	694	6,027
Other	20,468	16,927	16,512
Total noninterest expense	245,114	190,937	172,928
Income before income taxes	99,764	85,887	45,746
Income taxes	31,750	26,305	12,259
Net income	$ 68,014	$ 59,582	$ 33,487
Basic earnings per share (usd per share)	$ 1.89	$ 1.89	$ 1.23
Diluted earnings per share (usd per share)	1.88	1.88	1.22
Cash dividends per common share (usd per share)	$ 0.68	$ 0.68	$ 0.68