Consolidated Balance Sheets (unaudited) (Parenthetical) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Preferred stock, par value	$ 1.00	$ 1.00	$ 1.00
Preferred stock, shares authorized	250,000	250,000	250,000
Preferred stock, shares issued	15,624	15,710	15,648
Common stock, par value	$ 2.50	$ 2.50	$ 2.50
Common stock, shares authorized	20,000,000	20,000,000	20,000,000
Common stock, shares issued	7,457,222	7,437,472	7,451,022
Common stock, shares outstanding	7,457,222	7,437,472	7,451,022
Series 2009 Preferred Stock [Member]
Preferred stock, par value	$ 1.00		$ 1.00
Preferred stock, shares issued	3,710		3,710
Preferred stock, dividend rate, percentage	8.00%		8.00%
Series 2011 Preferred Stock [Member]
Preferred stock, par value	$ 1.0	$ 1.0	$ 1.0
Preferred stock, shares issued	11,914	12,000	11,938
Preferred stock, dividend rate, percentage	8.00%	8.00%	8.00%