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Debt (Narrative) (Details) - USD ($)
Aug. 14, 2018
Aug. 08, 2018
Oct. 04, 2018
Sep. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]          
Loans held for investment that are pledged as collateral       $ 970,200,000 $ 852,300,000
ODAF II | Revolving Credit Facility          
Debt Instrument [Line Items]          
Line of credit   $ 175,000,000      
ODAC | Revolving Credit Facility          
Debt Instrument [Line Items]          
Amount of debt repaid   $ 100,000,000      
ODAF | Revolving Credit Facility          
Debt Instrument [Line Items]          
Amount of debt repaid $ 150,000,000        
LIBOR | ODAF II | Revolving Credit Facility          
Debt Instrument [Line Items]          
Basis spread on variable rate   3.00%      
Subsequent Event | On Deck Capital, Inc. agreement, due January 2019 | Revolving Credit Facility          
Debt Instrument [Line Items]          
Debt instrument, face amount     $ 30,000,000