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(5) Interest Income and Interest Expense (Details - Interest expense) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
ComponentsOfInterestExpenseLineItems [Line Items] |  |
Total interest expense | $ 20,946 | $ 26,991
Securitization Trust Debt [Member] |  |
ComponentsOfInterestExpenseLineItems [Line Items] |  |
Total interest expense | 18,453 | 23,798
Warehouse Lines Of Credit [Member] |  |
ComponentsOfInterestExpenseLineItems [Line Items] |  |
Total interest expense | 1,314 | 1,763
Residual interest financing [Member] |  |
ComponentsOfInterestExpenseLineItems [Line Items] |  |
Total interest expense | 566 | 938
Subordinated renewable notes [Member] |  |
ComponentsOfInterestExpenseLineItems [Line Items] |  |
Total interest expense | $ 613 | $ 492

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