Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest income
Loans	$ 428,374	$ 344,472	$ 302,314
Securities
Taxable	23,948	18,531	16,551
Tax-exempt	6,456	9,433	9,814
Other	3,076	2,314	459
Total interest income	461,854	374,750	329,138
Interest expense
Deposits	49,760	24,620	17,856
Borrowings	15,569	13,233	10,291
Total interest expense	65,329	37,853	28,147
Net interest income	396,525	336,897	300,991
Provision for loan losses	6,810	7,550	7,530
Net interest income after provision for loan losses	389,715	329,347	293,461
Noninterest income
Service charges on deposit accounts	34,660	33,224	31,875
Fees and commissions	23,868	21,934	18,814
Insurance commissions	8,590	8,361	8,508
Wealth management revenue	13,540	11,884	11,652
Mortgage banking income	50,142	43,415	49,443
Net (losses) gains on sales of securities	(16)	148	1,186
BOLI income	4,644	4,353	4,635
Other	8,533	8,821	11,302
Total noninterest income	143,961	132,140	137,415
Noninterest expense
Salaries and employee benefits	214,294	184,540	172,448
Data processing	18,627	16,474	17,723
Net occupancy and equipment	42,111	37,756	34,394
Other real estate owned	1,892	2,470	5,696
Professional fees	8,753	7,150	7,970
Advertising and public relations	9,464	8,248	7,080
Intangible amortization	7,179	6,530	6,747
Communications	8,318	7,578	8,329
Merger and conversion related expenses	14,246	10,378	4,023
Extinguishment of debt	0	205	2,539
Loss share termination	0	0	2,053
Other	20,145	20,289	26,097
Total noninterest expense	345,029	301,618	295,099
Income before income taxes	188,647	159,869	135,777
Income taxes	41,727	67,681	44,847
Net income	$ 146,920	$ 92,188	$ 90,930
Basic earnings per share (usd per share)	$ 2.80	$ 1.97	$ 2.18
Diluted earnings per share (usd per share)	2.79	1.96	2.17
Cash dividends per common share (usd per share)	$ 0.80	$ 0.73	$ 0.71