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Stock Offerings (Details) - USD ($)
9 Months Ended 54 Months Ended
Apr. 20, 2017
Mar. 13, 2017
Jan. 05, 2017
Dec. 06, 2016
Mar. 09, 2016
Jun. 30, 2014
Sep. 08, 2011
Sep. 30, 2017
Sep. 30, 2016
Mar. 08, 2016
Mar. 10, 2017
Dec. 31, 2016
Stock offering                        
Proceeds from stock offering, net of issuance costs               $ 4,931,000 $ 0      
Common stock, par value (in dollars per share)               $ 1       $ 1
Number of designated preferred shares (in shares)               783       9,283
Preferred stock, par value (in dollars per share)               $ 1,000       $ 1,000
Aggregate redemption price               $ 8,500,000        
Series B Preferred Stock                        
Stock offering                        
Number of designated preferred shares (in shares)           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 designated preferred shares (in shares)           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                        
Stock offering (in shares)             8,500          
Dividend rate         9.00%   1.00%     1.00%    
SBLF capital received             $ 8,500,000          
Preferred stock, par value (in dollars per share)             $ 1,000          
Stock redeemed (in shares)     8,500                  
Liquidation amount per share (in dollars per share)     $ 1,000                  
Aggregate redemption price     $ 8,508,500                  
Rights Offering                        
Stock offering                        
Number of shares into which rights may be converted (in shares)                     434,783  
Stock offering (in shares) 434,783                      
Proceeds from stock offering, net of issuance costs $ 5,000,000                      
Private Placement                        
Stock offering                        
Stock offering (in shares)       1,913,044                
Common stock, par value (in dollars per share)       $ 1.00                
Sale of stock, price per share (in dollars per share)       $ 11.50                
Proceeds from stock offering, gross       $ 22,000,000                
Proceeds from stock offering, net of issuance costs       $ 20,500,000                
Chief Executive Officer                        
Stock offering                        
Stock offering (in shares)   100,000                    
Chief Executive Officer | Investment Agreement                        
Stock offering                        
Stock offering (in shares)   9,001                    
Chief Executive Officer | Rights Offering                        
Stock offering                        
Stock offering (in shares)   90,999                    
Maximum | Chief Executive Officer | Investment Agreement                        
Stock offering                        
Number of shares into which rights may be converted (in shares)   100,000