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Stock Offerings (Details) - USD ($)
$ / shares in Units, $ in Millions
7 Months Ended 54 Months Ended
Jun. 30, 2014
Sep. 08, 2011
Sep. 30, 2016
Mar. 08, 2016
Dec. 31, 2015
Stock offering          
Number of shares issued     9,283   9,283
Preferred stock, par value (in dollars per share)     $ 1,000   $ 1,000
Series B Preferred Stock          
Stock offering          
Number of shares issued 400        
Dividend rate 6.00%        
Period from first, second, third, fourth, and fifth anniversary of original issue date that stock may be convertible 30 days        
Conversion price (in dollars per share) $ 16        
Series C Preferred Stock          
Stock offering          
Number of shares issued 383.4        
Dividend rate 6.50%        
Period from first, second, third, fourth, and fifth anniversary of original issue date that stock may be convertible 30 days        
Conversion price (in dollars per share) $ 16        
Preferred Class A          
Stock offering          
Dividend rate     9.00% 1.00%  
Stock offering (in shares)   8,500      
SBLF capital received   $ 8.5      
Preferred stock, par value (in dollars per share)   $ 1,000