Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Previously Reported [Member] Common Stock [Member]	Previously Reported [Member] Additional Paid-in Capital [Member]	Previously Reported [Member] Treasury Stock [Member]	Previously Reported [Member] Retained Earnings [Member]	Previously Reported [Member] AOCI Attributable to Parent [Member]	Previously Reported [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Beginning balance at Dec. 31, 2016							$ 2,818	$ 27,900	$ (2,114)	$ 29,960	$ (4,491)	$ 54,073
Net income										3,704		3,704
Other comprehensive income (loss)											525	525
Stock compensation expense								164				164
Exercise of stock options (53,586 shares)							67	1,309				1,376
Issuance of common stock							73	1,601				1,674
Cash dividends declared on common stock										(1,763)		(1,763)
Ending Balance at Sep. 30, 2017							2,958	30,974	(2,114)	31,901	(3,966)	59,753
Beginning balance at Jun. 30, 2017											(4,119)
Net income												1,707
Other comprehensive income (loss)											153	153
Ending Balance at Sep. 30, 2017							2,958	30,974	(2,114)	31,901	(3,966)	59,753
Beginning balance at Dec. 31, 2017	$ 2,966	$ 31,031	$ (2,114)	$ 32,726	$ (5,518)	$ 59,091	2,966	31,031	(2,114)	32,913	(5,705)	59,091
Net income										3,935		3,935
Other comprehensive income (loss)											(1,695)	(1,695)
Stock compensation expense								187				187
Cash dividends declared on common stock										(1,908)		(1,908)
Cumulative effect of change in accounting principle for marketable equity securities, net of tax at Dec. 31, 2017										187	(187)
Ending Balance at Sep. 30, 2018							2,966	31,218	(2,114)	34,940	(7,400)	59,610
Beginning balance at Jun. 30, 2018											(6,956)
Net income												1,161
Other comprehensive income (loss)											(444)	(444)
Ending Balance at Sep. 30, 2018							$ 2,966	$ 31,218	$ (2,114)	$ 34,940	$ (7,400)	$ 59,610