CONSOLIDATED STATEMENTS OF INCOME - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest income
Loans, including fees	$ 101,560,000	$ 87,002,000	$ 78,770,000
Securities
Taxable	14,550,000	12,004,000	12,366,000
Tax exempt	12,000,000	11,970,000	11,862,000
Other interest income	217,000	134,000	97,000
Total interest income	128,327,000	111,110,000	103,095,000
Interest expense
Deposits	4,169,000	3,678,000	3,678,000
Federal Home Loan Bank advances	4,418,000	3,387,000	3,572,000
Subordinated debentures	1,425,000	1,264,000	1,286,000
Other borrowings	714,000	56,000	71,000
Total interest expense	10,726,000	8,385,000	8,607,000
Net interest income	117,601,000	102,725,000	94,488,000
Provision for loan losses	1,705,000	1,625,000	1,500,000
Net interest income after provision for loan losses	115,896,000	101,100,000	92,988,000
Non-interest income
Service charges on deposit accounts	21,006,000	22,039,000	20,698,000
Interchange income	11,116,000	9,239,000	7,590,000
Mortgage banking	10,044,000	8,355,000	6,754,000
Trust and investment product fees	4,866,000	4,947,000	4,712,000
Increase in cash surrender value of life insurance	1,513,000	1,236,000	1,298,000
Net realized gains on securities (includes $170, $386, $24 accumulated other comprehensive income (AOCI) reclassifications for realized net gains on available for sale securities	170,000	386,000	24,000
Gain/(Loss) on sale and write-down of OREO	268,000	68,000	(153,000)
Other income	3,629,000	4,002,000	2,084,000
Total non-interest income	52,612,000	50,272,000	43,007,000
Non-interest expense
Salaries and employee benefits	64,327,000	57,741,000	54,132,000
Net occupancy	9,298,000	8,326,000	7,628,000
Equipment	12,696,000	11,360,000	10,337,000
Intangibles amortization	1,342,000	1,640,000	1,690,000
Telecommunications	1,647,000	1,775,000	1,747,000
Stationery printing and supplies	1,052,000	1,162,000	1,174,000
FDIC assessment	1,560,000	1,655,000	1,620,000
Marketing	3,390,000	3,193,000	3,187,000
Collection expense	910,000	1,173,000	1,330,000
Prepayment penalty on FHLB advance		2,364,000
Acquisition related expenses	7,130,000	731,000	3,119,000
Consultant expense	549,000	1,106,000	1,400,000
Interchange expense	3,376,000	2,619,000	2,287,000
Other expenses	10,771,000	10,752,000	9,569,000
Total non-interest expense	118,048,000	105,597,000	99,220,000
Income before income tax	50,460,000	45,775,000	36,775,000
Income tax expense (includes $60, $135, and $8 income tax expense from AOCI reclassification items)	12,137,000	10,233,000	$ 7,779,000
Redemption of preferred stock	$ 0
Net income attributable to common shareholders		$ 35,542,000
Net income per common share:
Basic	$ 1.66	$ 1.64	$ 1.40
Diluted	1.64	1.62	1.39
Dividend per share	$ 0.61	$ 0.54	$ 0.42