Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest income
Loans	$ 302,314	$ 236,262	$ 199,844
Securities
Taxable	16,551	17,026	17,096
Tax-exempt	9,814	9,520	9,073
Other	459	215	396
Total interest income	329,138	263,023	226,409
Interest expense
Deposits	17,856	13,715	16,216
Borrowings	10,291	7,950	7,711
Total interest expense	28,147	21,665	23,927
Net interest income	300,991	241,358	202,482
Provision for loan losses	7,530	4,750	6,167
Net interest income after provision for loan losses	293,461	236,608	196,315
Noninterest income
Service charges on deposit accounts	31,875	29,269	26,756
Fees and commissions	18,814	15,761	14,012
Insurance commissions	8,508	8,423	8,194
Wealth management revenue	11,652	9,808	8,545
Mortgage banking income	49,443	35,815	14,862
Net gains on sales of securities	1,186	96	375
BOLI income	4,635	3,612	2,985
Other	11,302	5,486	4,780
Total noninterest income	137,415	108,270	80,509
Noninterest expense
Salaries and employee benefits	172,448	145,111	115,108
Data processing	17,723	14,251	11,570
Net occupancy and equipment	34,394	26,987	20,252
Other real estate owned	5,696	3,045	4,593
Professional fees	5,358	4,384	4,485
Advertising and public relations	7,080	6,112	5,923
Intangible amortization	6,747	6,069	5,606
Communications	8,329	7,278	5,949
Merger-related expenses	4,023	11,614	694
Extinguishment of debt	2,539	0	0
Loss share termination	2,053	0	0
Other	28,709	20,263	16,757
Total noninterest expense	295,099	245,114	190,937
Income before income taxes	135,777	99,764	85,887
Income taxes	44,847	31,750	26,305
Net income	$ 90,930	$ 68,014	$ 59,582
Basic earnings per share (usd per share)	$ 2.18	$ 1.89	$ 1.89
Diluted earnings per share (usd per share)	2.17	1.88	1.88
Cash dividends per common share (usd per share)	$ 0.71	$ 0.68	$ 0.68