Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Deferred Compensation Obligation Under Rabbi Trust	Retained Earnings	Accumulated Other Comprehensive Income	Stock Held by Rabbi Trust	Treasury Stock
Beginning balance at Dec. 31, 2015	$ 53,941	$ 35,927	$ 0	$ 18,520	$ 86	$ 0	$ (592)
Beginning balance (in shares) at Dec. 31, 2015		4,646,238
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	5,523			5,523
Other comprehensive income (loss)	157				157
Treasury shares purchased	(26)						(26)
Treasury shares purchased (in shares)		(2,127)
Funding of retirement plan/trust	814	$ 198	1,383			(1,383)	616
Stock issued to fund Rabbi Trust (in shares)		60,920
Options exercised	$ 4	$ 2					2
Options exercised (in shares)	449	449
Restricted stock granted (in shares)		42,167
Restricted stock forfeited (in shares)		(6,579)
Compensation expense related to stock option and restricted stock grants	$ 411	$ 411
Dividends declared on common stock ($0.22 per share)	(752)			(752)
Ending balance at Dec. 31, 2016	$ 60,072	$ 36,538	1,383	23,291	243	(1,383)	0
Ending balance (in shares) at Dec. 31, 2016	4,741,068	4,741,068
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 5,691			5,691
Other comprehensive income (loss)	897				897
Reclassification due to the adoption of ASU 2018-02	$ 247			(247)	247
Funding of retirement plan/trust			16			(16)
Options exercised (in shares)	0
Net proceeds of common stock issued	$ 28,027	$ 28,027
Net proceeds of common stock issued (in shares)		1,249,999
Restricted stock granted (in shares)		53,554
Restricted stock forfeited (in shares)		(4,057)
Compensation expense related to stock option and restricted stock grants	709	$ 709
Dividends declared on common stock ($0.22 per share)	(1,203)			(1,203)
Ending balance at Dec. 31, 2017	$ 94,193	$ 65,274	$ 1,399	$ 27,532	$ 1,387	$ (1,399)	$ 0
Ending balance (in shares) at Dec. 31, 2017	6,040,564	6,040,564