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5. Interest Income and Interest Expense (Details - Interest expense) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Total interest expense $ 27,940 $ 25,808 $ 82,933 $ 75,057
Securitization Trust Debt [Member]        
Total interest expense 24,208 22,678 72,662 66,762
Warehouse Lines of Credit [Member]        
Total interest expense 2,407 1,827 6,387 5,850
Residual interest financing [Member]        
Total interest expense 956 936 2,867 1,387
Subordinated renewable notes [Member]        
Total interest expense $ 369 $ 367 $ 1,017 $ 1,058