CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock [Member]	Surplus [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]
Balance at Dec. 31, 2017	$ 403,678	$ 15,858	$ 283,552	$ (8,988)	$ 114,468	$ (1,212)
Net income	10,807				10,807
Other comprehensive income (loss)	(1,757)					(1,757)
Cumulative adjustment for equity security(ASU 2016-01)					(127)	127
Restricted stock units issued		70	(70)
Restricted stock awards forfeitures		(77)	77
Restricted stock units/awards repurchased on vesting to pay taxes	(1,337)	(32)	(1,305)
Amortization of restricted stock awards/units	976		976
Cash dividends declared on common stock	(853)				(853)
Common stock options exercised	52	5	47
Sales of shares (dividend reinvestment program)	10,619	264	10,355
Issuance of shares for Employee Stock Purchase Plan	221	6	215
Issuance of common stock for acquisition		17	(17)
Balance at Mar. 31, 2018	422,406	16,111	293,830	(8,988)	124,295	(2,842)
Balance at Dec. 31, 2018	469,013	16,459	309,088	(8,988)	154,799	(2,345)
Net income	11,425				11,425
Other comprehensive income (loss)	616					616
Cumulative adjustment for leases (ASC 842)	661				661
Restricted stock units issued		108	(108)
Restricted stock units/awards repurchased on vesting to pay taxes	(964)	(30)	(934)
Amortization of restricted stock awards/units	1,390		1,390
Cash dividends declared on common stock	(967)				(967)
Common stock options exercised	4	1	3
Exercise of warrants, 7,109 net of 4,218 shares used to exercise, 2,891 shares		2	(2)
Issuance of shares for Employee Stock Purchase Plan	294	8	286
Issuance of common stock for acquisition		1	(1)
Balance at Mar. 31, 2019	$ 481,472	$ 16,549	$ 309,722	$ (8,988)	$ 165,918	$ (1,729)