Consolidated Balance Sheets (Parenthetical) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Preferred stock, shares authorized	250,000	250,000	250,000
Common stock, par value	$ 2.5	$ 2.5	$ 2.5
Common stock, shares authorized	20,000,000	20,000,000	20,000,000
Common stock, shares issued	7,437,472	7,425,472	7,425,472
Series 2009 Preferred Stock And Related Surplus [Member]
Preferred stock, par value	$ 1	$ 1	$ 1
Preferred stock, shares issued	3,710	3,710	3,710
Preferred stock, dividend rate, percentage	8.00%	8.00%	8.00%
Series 2011 Preferred Stock And Related Surplus [Member]
Preferred stock, par value	$ 1	$ 1	$ 1
Preferred stock, shares issued	12,000	12,000	12,000
Preferred stock, dividend rate, percentage	8.00%	8.00%	8.00%