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(5) Interest Income and Interest Expense (Details - Interest expense) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Securities Financing Transaction [Line Items] |  |  |  |
Total interest expense | $ 18,334 | $ 24,901 | $ 58,260 | $ 78,377
Securitization Trust Debt [Member] |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Total interest expense | 15,292 | 21,605 | 50,568 | 67,770
Warehouse Lines Of Credit [Member] |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Total interest expense | 929 | 1,856 | 3,264 | 6,294
Residual interest financing [Member] |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Total interest expense | 1,413 | 876 | 2,446 | 2,734
Subordinated renewable notes [Member] |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Total interest expense | $ 700 | $ 564 | $ 1,982 | $ 1,579

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