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(5) Interest Income and Interest Expense (Details - Interest expense) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Debt Instrument [Line Items] |  |
Total interest expense | $ 16,400 | $ 20,946
Securitization Trust Debt [Member] |  |
Debt Instrument [Line Items] |  |
Total interest expense | 13,528 | 18,453
Warehouse lines of credit |  |
Debt Instrument [Line Items] |  |
Total interest expense | 1,158 | 1,314
Residual interest financing [Member] |  |
Debt Instrument [Line Items] |  |
Total interest expense | 1,094 | 566
Subordinated renewable notes [Member] |  |
Debt Instrument [Line Items] |  |
Total interest expense | $ 620 | $ 613

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