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Small Business Lending Fund (Details Textual) - USD ($)
 12 Months Ended
Mar. 06, 2017
Jan. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2011
Class of Stock [Line Items]          
Preferred stock, shares issued     12,000 12,000  
Preferred stock, dividend rate (as a percent)     9.00% 1.00%  
Preferred stock dividends     $ 1,022,000 $ 120,000  
Common stock, par value (in dollars per share)     $ 1 $ 1  
Proceeds from issuance of common stock     $ 803,957 $ 4,043,011  
SBLF Program [Member]          
Class of Stock [Line Items]          
Preferred stock, shares issued         12,000
Share price (in dollars per share)         $ 1,000
Preferred stock, redemption price (in dollars per share)         $ 1,000
Subsequent Event [Member]          
Class of Stock [Line Items]          
Payments for redemption of preferred stock $ 12,000,000        
Common Stock [Member] | Subsequent Event [Member]          
Class of Stock [Line Items]          
Issuance of common stock in public offering (in shares)   2,010,084      
Common stock, par value (in dollars per share)   $ 1.00      
Proceeds from issuance of common stock   $ 33,200,000