Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock	Surplus	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock	Total
Balance at Dec. 31, 2017	$ 6,047	$ 45,442	$ 50,595	$ (5,662)	$ (5,051)	$ 91,371
Increase (Decrease) in Stockholders' Equity
Net income	0	0	8,095	0	0	8,095
Other comprehensive income (loss)	0	0	0	(2,964)	0	(2,964)
Issuance of stock under equity compensation plan	0	(51)	0	0	186	135
Purchase of treasury stock	0	0	0	0	(179)	(179)
Stock dividend	232	4,782	(5,014)	0	0	0
Cash dividends declared, common stock	0	0	(1,586)	0	0	(1,586)
Balance at Sep. 30, 2018	6,279	50,173	52,090	(8,626)	(5,044)	94,872
Balance at Jun. 30, 2018	6,047	50,456	49,594	(7,734)	(5,230)	93,133
Increase (Decrease) in Stockholders' Equity
Net income	0	0	3,098	0	0	3,098
Other comprehensive income (loss)	0	0	0	(892)	0	(892)
Issuance of stock under equity compensation plan	0	(51)	0	0	186	135
Stock dividend	232	(232)	0	0	0	0
Cash dividends declared, common stock	0	0	(602)	0	0	(602)
Balance at Sep. 30, 2018	6,279	50,173	52,090	(8,626)	(5,044)	94,872
Balance at Dec. 31, 2018	6,279	50,173	54,105	(6,099)	(5,044)	99,414
Increase (Decrease) in Stockholders' Equity
Net income	0	0	12,046	0	0	12,046
Other comprehensive income (loss)	0	0	0	3,435	0	3,435
Stock dividend	241	5,554	(5,795)	0	0	0
Cash dividends declared, common stock	0	0	(2,081)	0	0	(2,081)
Balance at Sep. 30, 2019	6,520	55,727	58,275	(2,664)	(5,044)	112,814
Balance at Jun. 30, 2019	6,279	55,968	55,168	(2,991)	(5,044)	109,380
Increase (Decrease) in Stockholders' Equity
Net income	0	0	3,860	0	0	3,860
Other comprehensive income (loss)	0	0	0	327	0	327
Stock dividend	241	(241)	0	0	0	0
Cash dividends declared, common stock	0	0	(753)	0	0	(753)
Balance at Sep. 30, 2019	$ 6,520	$ 55,727	$ 58,275	$ (2,664)	$ (5,044)	$ 112,814