Consolidated Statements Of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Deferred Compensation Obligation Under Rabbi Trust [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Stock Held by Rabbi Trust [Member]	Treasury Stock [Member]
Beginning balance at Dec. 31, 2014	$ 51,229	$ 35,553		$ 15,566	$ 169		$ (59)
Beginning balance (in shares) at Dec. 31, 2014		4,662,606
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,787			2,787
Other comprehensive income (loss)	(56)				(56)
Treasury shares purchased	(533)						(533)
Treasury shares purchased (in shares)		(48,059)
Restricted stock granted (in shares)		31,841
Restricted stock forfeited (in shares)		(1,001)
Compensation expense related to stock option and restricted stock grants	279	$ 279
Dividends declared on common stock	(560)			(560)
Ending balance at Sep. 30, 2015	53,146	$ 35,832		17,793	113		(592)
Ending balance (in shares) at Sep. 30, 2015		4,645,387
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	4,646,238
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 4,000			4,000
Other comprehensive income (loss)	160				160
Treasury shares purchased	(26)						(26)
Treasury shares purchased (in shares)		(2,127)
Funding of Supplemental Director Retirement Plan	814	$ 198	1,359			(1,359)	616
Funding of Supplemental Director Retirement Plan (in shares)		60,920
Options exercised	$ 4	$ 2					2
Options exercised (in shares)	449	449
Restricted stock granted (in shares)		41,619
Restricted stock forfeited (in shares)		(5,379)
Compensation expense related to stock option and restricted stock grants	$ 302	$ 302
Dividends declared on common stock	(562)			(562)
Ending balance at Sep. 30, 2016	$ 58,633	$ 36,429	$ 1,359	$ 21,958	$ 246	$ (1,359)	$ 0
Ending balance (in shares) at Sep. 30, 2016	4,741,720	4,741,720