CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - 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, 2014					$ 1,221
Net income						$ 15,629
Other comprehensive income (loss)					(1,688)	(1,688)
Balance at Sep. 30, 2015					(467)
Balance at Jun. 30, 2015					803
Net income						5,383
Other comprehensive income (loss)					(1,270)	(1,270)
Balance at Sep. 30, 2015					(467)
Balance at Dec. 31, 2015	$ 13,717	$ 213,203	$ (8,988)	$ 58,123	(379)	$ 275,676
Shares outstanding at Dec. 31, 2015	16,068,119					16,068,119
Net income				19,169		$ 19,169
Other comprehensive income (loss)					(1,398)	(1,398)
Issuance of restricted stock, net of forfeitures	$ (9)	9
Issuance of restricted stock, net of forfeitures, shares	10,860
Restricted stock repurchased on vesting to pay taxes	$ (20)	(476)				(496)
Restricted stock repurchased on vesting to pay taxes, shares	24,093
Amortization of restricted awards/units		2,154				2,154
Cash dividends declared on common stock				(2,452)		(2,452)
Common stock option expense		45				45
Common stock options exercised and related tax benefits	$ 16	230				246
Common stock options exercised and related tax benefits, shares	18,641
Common stock options, related tax benefits, shares	1,317
Sales of shares (Dividend Reinvestment Program)	$ 722	14,810				15,532
Sales of shares (Dividend Reinvestment Program), shares	866,018
Issuance of shares for Employee Stock Purchase Plan	$ 25	531				556
Issuance of shares for Employee Stock Purchase Plan, shares	26,913
Balance at Sep. 30, 2016	$ 14,451	230,506	(8,988)	74,840	(1,777)	$ 309,032
Shares outstanding at Sep. 30, 2016	16,944,738					16,944,738
Balance at Jun. 30, 2016					(2,503)
Net income						$ 7,116
Other comprehensive income (loss)					726	726
Balance at Sep. 30, 2016	$ 14,451	$ 230,506	$ (8,988)	$ 74,840	$ (1,777)	$ 309,032
Shares outstanding at Sep. 30, 2016	16,944,738					16,944,738