CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Interest income
Loans, including fees	$ 127,611	$ 101,560	$ 87,002
Securities
Taxable	17,453	14,550	12,004
Tax exempt	13,127	12,000	11,970
Other interest income	356	217	134
Total interest income	158,547	128,327	111,110
Interest expense
Deposits	6,143	4,169	3,678
Federal Home Loan Bank advances	5,247	4,418	3,387
Subordinated debentures	2,307	1,425	1,264
Other borrowings	1,981	714	56
Total interest expense	15,678	10,726	8,385
Net interest income	142,869	117,601	102,725
Provision for loan losses	1,250	1,705	1,625
Net interest income after provision for loan losses	141,619	115,896	101,100
Non-interest income
Service charges on deposit accounts	20,901	21,006	22,039
Interchange income	11,868	11,116	9,239
Mortgage banking	10,341	10,044	8,355
Trust and investment product fees	5,620	4,866	4,947
Increase in cash surrender value of life insurance	1,778	1,513	1,236
Net realized gains on securities (includes $84, $170, $386 accumulated other comprehensive income (AOCI) reclassifications for realized net gains on available for sale securities	84	170	386
Gain on sale of foreclosed assets	262	268	68
Other income	2,511	3,629	4,002
Total non-interest income	53,365	52,612	50,272
Non-interest expense
Salaries and employee benefits	72,614	64,327	57,741
Net occupancy	10,710	9,298	8,326
Equipment	13,770	12,696	11,360
Intangibles amortization	2,011	1,342	1,640
Telecommunications	1,836	1,647	1,775
Stationery printing and supplies	1,255	1,052	1,162
FDIC assessment	1,407	1,560	1,655
Marketing	3,262	3,390	3,193
Collection expense	991	910	1,173
Prepayment penalty on FHLB advance	214		2,364
Acquisition related expenses	9,004	7,130	731
Consultant Expense	0	549	1,106
Interchange expense	3,387	3,376	2,619
Other expenses	12,149	10,771	10,752
Total non-interest expense	132,610	118,048	105,597
Income before income tax	62,374	50,460	45,775
Income tax expense (includes $29, $60, and $135 income tax expense from AOCI reclassification items)	12,936	12,137	10,233
Net income attributable to common shareholders	$ 49,438	$ 38,323	$ 35,542
Net income per common share:
Basic	$ 1.97	$ 1.66	$ 1.64
Diluted	1.94	1.64	1.62
Dividend per share	$ 0.68	$ 0.61	$ 0.54