CONSOLIDATED STATEMENTS OF INCOME - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Interest income
Loans, including fees	$ 87,002,000	$ 78,770,000	$ 77,095,000
Securities
Taxable	12,004,000	12,366,000	11,873,000
Tax exempt	11,970,000	11,862,000	12,247,000
Other interest income	134,000	97,000	64,000
Total interest income	111,110,000	103,095,000	101,279,000
Interest expense
Deposits	3,678,000	3,678,000	4,927,000
Federal Home Loan Bank advances	3,387,000	3,572,000	3,307,000
Subordinated debentures	1,264,000	1,286,000	1,675,000
Other borrowings	56,000	71,000	70,000
Total interest expense	8,385,000	8,607,000	9,979,000
Net interest income	102,725,000	94,488,000	91,300,000
Provision for loan losses	1,625,000	1,500,000	4,534,000
Net interest income after provision for loan losses	101,100,000	92,988,000	86,766,000
Non-interest income
Service charges on deposit accounts	22,039,000	20,698,000	20,427,000
Interchange income	9,239,000	7,590,000	7,056,000
Mortgage banking	8,355,000	6,754,000	6,799,000
Trust and investment product fees	4,947,000	4,712,000	4,756,000
Increase in cash surrender value of life insurance	1,236,000	1,298,000	1,378,000
Net realized gains/(losses) on securities (includes $386, $24, and $835 accumulated other comprehensive income (AOCI) reclassifications for realized net gains on available for sale securities)	386,000	24,000	835,000
Gain (Loss) on sale and write-down of OREO	68,000	(153,000)	(539,000)
Other income	4,002,000	2,084,000	2,417,000
Total non-interest income	50,272,000	43,007,000	43,129,000
Non-interest expense
Salaries and employee benefits	57,741,000	54,132,000	52,165,000
Net occupancy	8,326,000	7,628,000	7,139,000
Equipment	11,360,000	10,337,000	9,931,000
Intangibles amortization	1,640,000	1,690,000	1,868,000
Telecommunications	1,775,000	1,747,000	1,796,000
Stationery printing and supplies	1,162,000	1,174,000	1,190,000
FDIC assessment	1,655,000	1,620,000	1,711,000
Marketing	3,193,000	3,187,000	3,660,000
Collection expense	1,173,000	1,330,000	3,300,000
Prepayment penalty on FHLB advance	2,364,000		2,239,000
Acquisition related costs	731,000	3,119,000
Consultant expense	1,106,000	1,400,000	1,582,000
Interchange expense	2,619,000	2,287,000	1,918,000
Other expenses	10,752,000	9,569,000	9,732,000
Total non-interest expense	105,597,000	99,220,000	98,231,000
Income before income tax	45,775,000	36,775,000	31,664,000
Income tax expense (includes $135, $8, and $284 income tax expense from AOCI reclassification items)	10,233,000	7,779,000	5,319,000
Net income	35,542,000	28,996,000	26,345,000
Preferred dividends and discount accretion			(504,000)
Redemption of preferred stock	0		(148,000)
Net income attributable to common shareholders	$ 35,542,000	$ 28,996,000	$ 25,693,000
Net income per common share:
Basic	$ 1.64	$ 1.40	$ 1.26
Diluted	$ 1.62	$ 1.39	$ 1.26