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5. Interest Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Total interest expense $ 20,893 $ 14,848 $ 58,442 $ 41,709
Securitization Trust Debt [Member]        
Total interest expense 18,228 12,466 49,867 35,012
Warehouse lines of credit [Member]        
Total interest expense 2,111 1,644 6,777 4,376
Residual interest financing [Member]        
Total interest expense 227 338 744 1,111
Subordinated renewable notes [Member]        
Total interest expense $ 327 $ 400 $ 1,054 $ 1,210