Stockholders' Equity and Earnings per Common Share, OCI by Component, Anti-Dilutive Securities (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Computation of earnings per share [Abstract]
Net Income Available to Common Shareholders, Basic	$ (29)	$ 3,797	$ 3,634
Net Income Available to Common Stockholders, Diluted	$ (29)	$ 3,797	$ 3,634
Weighted Average Common Shares, Basic (in shares)	4,991,060	4,959,173	4,959,009
Potentially dilutive common shares - stock options (in shares)	0	2,000	0
Potentially dilutive common shares - employee stock purchase program (in shares)	0	0	0
Weighted Average Common Shares, Diluted (in shares)	4,991,060	4,960,934	4,959,009
Earnings Per Share, Basic (in dollars per share)	$ (0.01)	$ 0.77	$ 0.73
Earnings Per Share, Diluted (in dollars per share)	$ (0.01)	$ 0.77	$ 0.73
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	0	52,000	76,000