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(5) Interest Income and Interest Expense (Details - Interest expense) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Obligation with Joint and Several Liability Arrangement [Line Items] |  |  |  |
Total interest expense | $ 24,901 | $ 27,940 | $ 78,377 | $ 82,933
Securitization Trust Debt [Member] |  |  |  |
Obligation with Joint and Several Liability Arrangement [Line Items] |  |  |  |
Total interest expense | 21,605 | 24,208 | 67,770 | 72,662
Warehouse Lines Of Credit [Member] |  |  |  |
Obligation with Joint and Several Liability Arrangement [Line Items] |  |  |  |
Total interest expense | 1,856 | 2,407 | 6,294 | 6,387
Residual interest financing [Member] |  |  |  |
Obligation with Joint and Several Liability Arrangement [Line Items] |  |  |  |
Total interest expense | 876 | 956 | 2,734 | 2,867
Subordinated renewable notes [Member] |  |  |  |
Obligation with Joint and Several Liability Arrangement [Line Items] |  |  |  |
Total interest expense | $ 564 | $ 369 | $ 1,579 | $ 1,017

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