CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Surplus [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income/(Loss), Net of Tax [Member]	Total
Balance at Dec. 31, 2015					$ (379)
Net income						$ 19,169
Comprehensive income					(1,398)	(1,398)
Balance at Sep. 30, 2016					(1,777)
Balance at Jun. 30, 2016					(2,503)
Net income						7,116
Comprehensive income					726	726
Balance at Sep. 30, 2016					(1,777)
Balance at Dec. 31, 2016	$ 14,717	$ 238,708	$ (8,988)	$ 81,304	(1,531)	$ 324,210
Shares outstanding at Dec. 31, 2016	17,257,995					17,257,995
Net income				26,128		$ 26,128
Comprehensive income					1,186	1,186
Restricted stock units issued 61610 shares	$ 51	(51)
Restricted stock units issued 61610 shares, shares	61,610
Restricted stock awards forfeitures, (400) shares	$ (1)	1
Restricted stock awards forfeitures (400) shares, shares	(400)
Restricted stock units/awards repurchased on vesting to pay taxes, (46,884) shares	$ (39)	(1,376)				(1,415)
Restricted stock units/awards repurchased on vesting to pay taxes, (46,884) shares, shares	(46,884)
Amortization of restricted awards/units		2,536				2,536
Cash dividends declared on common stock (0.15 per share)				(2,635)		(2,635)
Common stock option expense		6				6
Common stock options exercised, 33,862 net of 8,744 used to exercise, 25,118 shares	$ 28	307				335
Common stock options exercised, 33,862 net of 8,744 used to exercise, 25,118 shares, shares	25,118
Sales of shares (Dividend Reinvestment Program), 867,377 shares	$ 723	25,354				26,077
Sales of shares (Dividend Reinvestment Program), 867,377 shares, shares	867,377
Issuance of shares for Employee Stock Purchase Plan, 19,820 shares	$ 17	602				619
Issuance of shares for Employee Stock Purchase Plan, 19,820 shares, shares	19,820
Issuance of shares for employee, saving and investment plan 30,123 shares	$ 25	864				889
Issuance of shares for employee, saving and investment plan 30,123 shares, shares	30,123
Common stock to be issued in wealth acquisition		2,000				2,000
Balance at Sep. 30, 2017	$ 15,521	268,951	(8,988)	104,797	(345)	$ 379,936
Shares outstanding at Sep. 30, 2017	18,214,759					18,214,759
Balance at Jun. 30, 2017					(538)
Net income						$ 10,206
Comprehensive income					193	193
Balance at Sep. 30, 2017	$ 15,521	$ 268,951	$ (8,988)	$ 104,797	$ (345)	$ 379,936
Shares outstanding at Sep. 30, 2017	18,214,759					18,214,759