Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Basic:
Net Income	$ 4,494	$ 4,441
Preferred Dividend	(36)	(36)
Earnings Applicable to Common Stock	$ 4,458	$ 4,405
Basic EPS	$ 0.27	$ 0.27
Weighted average number of basic shares outstanding	16,354	16,299
Diluted:
Adjusted Earnings Applicable to Common Stock	$ 4,481	$ 4,428
Diluted EPS	$ 0.27	$ 0.27
Weighted average number of diluted shares outstanding	16,510	16,455
Convertible Preferred Stock $7.00 Series [Member]
Diluted:
Preferred Dividend	$ 17	$ 17
Common Shares Attributable to Dilutive Effect of Conversion of Preferred Stock (in shares)	115	115
Convertible Preferred Stock $8.00 Series [Member]
Diluted:
Preferred Dividend	$ 6	$ 6
Common Shares Attributable to Dilutive Effect of Conversion of Preferred Stock (in shares)	41	41