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(5) Interest Income and Interest Expense (Details - Interest expense) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Debt Instrument [Line Items] |  |  |  |
Total interest expense | $ 18,771 | $ 18,980 | $ 35,171 | $ 39,925
Securitization Trust Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total interest expense | 15,745 | 16,823 | 29,273 | 35,276
Warehouse lines of credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total interest expense | 1,386 | 1,021 | 2,544 | 2,335
Residual interest financing [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total interest expense | 1,050 | 467 | 2,144 | 1,033
Subordinated renewable notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total interest expense | $ 590 | $ 669 | $ 1,210 | $ 1,281

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