Stockholders' Equity (Narrative) (Details) (USD $)	0 Months Ended	3 Months Ended
	Sep. 21, 2011	Mar. 31, 2013	Dec. 31, 2012
Class of Stock [Line Items]
Liquidation preference per share		$ 1,000	$ 1,000
Aggregate purchase price		$ 11,750,000
Securities purchase agreement, share repurchase amount		11,879,000
Securities purchase agreement, share repurchase paid in principal amount		11,750,000
Securities purchase agreement, share repurchase accured unpaid dividends amount		128,900
Number of stock repurchase from treasury		186,311
Repurchase of stock warrants	(458,000)
Shares of common stock		186,311
Par value per share		$ 1.00	$ 1.00
Exercise price per share		$ 9.46
Preferred stock dividend rate		3.874%
Expected dividend rate at a fixed rate for a specificed period		9.00%
Preferred Stock, Par or Stated Value Per Share		$ 10.00	$ 10.00
Cumulative Preferred Stock [Member]
Class of Stock [Line Items]
Shares of perpetual preferred stock		11,750
Liquidation preference per share		$ 1,000
Preferred Stock, Par or Stated Value Per Share		$ 10.00
Noncumulative Preferred Stock [Member]
Class of Stock [Line Items]
Shares of perpetual preferred stock		13,000
Liquidation preference per share		$ 1,000
Aggregate purchase price		$ 13,000,000
Minimum [Member]
Class of Stock [Line Items]
Expected dividend rate for the second through tenth dividend periods		1.00%
Expected dividend rate at a fixed rate for a specificed period		1.00%
Maximum [Member]
Class of Stock [Line Items]
Expected dividend rate for the second through tenth dividend periods		5.00%
Expected dividend rate at a fixed rate for a specificed period		7.00%