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Small Business Lending Fund (Details) - USD ($)
 12 Months Ended
Mar. 06, 2017
Jan. 30, 2017
Feb. 04, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Class of Stock [Line Items]              
Preferred stock, shares issued (in shares)       0 0    
Preferred stock, dividend rate (as a percent)     9.00%       1.00%
Preferred stock dividends       $ 0 $ 195,000 $ 1,000,000 $ 120,000
Common stock, par value (in dollars per share)       $ 1 $ 1    
Proceeds from issuance of common stock       $ 1,528,306 $ 37,852,113    
Payments for redemption of preferred stock $ 12,000,000     0 12,000,000    
Payment of dividends on preferred stock $ 195,000     $ 0 $ 195,000    
SBLF Program [Member]              
Class of Stock [Line Items]              
Preferred stock, shares issued (in shares)             12,000
Share price (in dollars per share)             $ 1,000
Common Stock [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