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Preferred Stock (Narrative) (Details) - USD ($)
 3 Months Ended 4 Months Ended 12 Months Ended
Mar. 21, 2017
Feb. 17, 2017
Feb. 15, 2016
Feb. 15, 2014
Jan. 30, 2009
Mar. 21, 2017
Mar. 21, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
May 26, 2015
Preferred stock, shares issued         30,000            
Class of warrant or right, number of securities called by warrants or rights         326,323            
Class of warrant or right, exercise price of warrants or rights         $ 13.79            
Proceeds from issuance of preferred stock and preference stock         $ 30,000,000            
Repurchase of warrant                     $ 120,786
Preferred stock, dividend rate, percentage       9.00% 5.00%            
Preferred stock, liquidation preference per share       $ 1,000 $ 1,000            
Dividends                   $ 7,900,000  
Preferred Stock, redemption date     Feb. 15, 2016                
Aggregate liquidation amount of Preferred Stock     $ 10,000,000                
Preferred stock redeemed, shares     10,000                
Proceeds from common stock               $ 0 $ 1,000    
Series A Preferred Stock [Member]                      
Preferred stock, shares issued               20,000 30,000    
Preferred stock, shares outstanding               20,000 30,000    
Preferred stock, dividend rate, percentage               9.00% 9.00%    
Preferred stock, liquidation preference per share               $ 1,000 $ 1,000    
Subsequent Event [Member] | Series A Preferred Stock [Member]                      
Preferred stock, shares outstanding   20,000                  
Preferred Stock, redemption date Mar. 21, 2017                    
Aggregate liquidation amount of Preferred Stock   $ 10,000,000                  
Preferred stock redeemed, shares   10,000                  
Scenario, Forecast [Member]                      
Proceeds from common stock           $ 7,000,000 $ 7,000,000