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Securities, Held-to-Maturity (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
item
Sep. 30, 2017
USD ($)
item
Held-to-Maturity    
Carrying Value $ 18,851,089 $ 18,851,089
Held-to-Maturity | B Piece bonds    
Held-to-Maturity    
Remaining of B Piece bond sold to the third party at par 51.00% 51.00%
B Piece retained percentage   49.00%
Number of B Piece bonds retained | item 2 2
Weighted average variable interest rate (as a percent) 3.55% 3.55%
Weighted average stated maturity (in years)   6 years 1 month 6 days
Weighted average effective interest rate (as a percent) 13.38% 13.38%
Face Value   $ 28,035,293
Carrying Value $ 18,851,089 18,851,089
Unrealized Gain 31,908 31,908
Estimated Fair Value 18,882,997 18,882,997
Discount value   18,300,000
Impairment charges   0
Interest income 500,000 900,000
Held-to-maturity securities, estimated fiscal year    
Within one year 3,400,000 3,400,000
After one year through five years 11,300,000 11,300,000
After five years through ten years 8,100,000 8,100,000
After ten years $ 5,200,000 $ 5,200,000