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Derivatives - Fair Value Hedges on Income Statement (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]        
Interest Income $ 23,067,707 $ 12,317,188 $ 65,439,146 $ 34,778,827
Interest Rate Swap [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in Income (7,000)   (7,000)  
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in Income $ 7,000   $ 7,000