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Small Business Lending Fund - Narrative (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 06, 2017
Jan. 30, 2017
Feb. 04, 2016
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Class of Stock [Line Items]                    
Preferred stock, shares issued (in shares)       0   0       0
Preferred stock, dividend rate (as a percent)     9.00%           1.00%  
Preferred stock dividends       $ 0 $ 0 $ 0 $ 195,000 $ 1,022,000 $ 120,000  
Proceeds from issuance of common stock           1,528,306 37,840,224      
Payments for redemption of preferred stock $ 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                
Proceeds from issuance of common stock   $ 33,200,000