Consolidated Balance Sheets (unaudited) (Parenthetical) (USD $)	3 Months Ended	12 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Common stock, par value (in dollars per share)	$ 2.50	$ 2.50	$ 2.50
Common stock, shares authorized	20,000,000us-gaap_CommonStockSharesAuthorized	20,000,000us-gaap_CommonStockSharesAuthorized	20,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued	10,586,242us-gaap_CommonStockSharesIssued	7,457,222us-gaap_CommonStockSharesIssued	8,301,746us-gaap_CommonStockSharesIssued
Common stock, shares outstanding	10,586,242us-gaap_CommonStockSharesOutstanding	7,457,222us-gaap_CommonStockSharesOutstanding	8,301,746us-gaap_CommonStockSharesOutstanding
Preferred stock, shares authorized	0us-gaap_PreferredStockSharesAuthorized	250,000us-gaap_PreferredStockSharesAuthorized	250,000us-gaap_PreferredStockSharesAuthorized
Series 2009 Preferred Stock [Member]
Preferred stock, par value (in dollars per share)	$ 0	$ 1.00	$ 1.00
Preferred stock, shares issued	0	3,610	3,710
Preferred stock, dividend rate, percentage	0.00%	8.00%	8.00%
Series 2011 Preferred Stock [Member]
Preferred stock, par value (in dollars per share)	$ 0	$ 1.00	$ 1.00
Preferred stock, shares issued	0	11,914	11,914
Preferred stock, dividend rate, percentage	0.00%	8.00%	8.00%

Face amount or stated value per share of common stock.

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