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4. Debt (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Warehouse lines of credit $ 127,695 $ 112,408
Residual interest financing 39,013 0
Subordinated renewable notes 16,948 16,566
Total other debt outstanding $ 186,226 130,841
Residual interest financing [Member]    
Interest rate 8.60%  
Revolving Maturity date January 2026  
Subordinated renewable notes [Member]    
Interest rate Weighted average rate of 8.31% and 7.99% at September 30, 2018 and December 31, 2017, respectively  
Revolving Maturity date Weighted average maturity of August 2020 and March 2020 at September 30, 2018 and December 31, 2017, respectively  
Warehouse lines of credit [Member]    
Warehouse lines of credit $ 79,438 25,629
Interest rate 5.50% over one month Libor (Minimum 6.50%)  
Revolving Maturity date April 2019  
Warehouse lines of credit (2) [Member]    
Warehouse lines of credit $ 38,241 77,546
Interest rate 3.00% over one month Libor (Minimum 4.5%)  
Revolving Maturity date September 2020  
Warehouse lines of credit (3) [Member]    
Warehouse lines of credit $ 11,599 11,100
Interest rate 6.75% over a commercial paper rate (Minimum 7.75%)  
Revolving Maturity date November 2019  
Residual interest financing [Member]    
Warehouse lines of credit   0
Residual interest financing $ 40,000  
Subordinated renewable notes [Member]    
Subordinated renewable notes $ 16,948 $ 16,566