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(8) Interest Income and Interest Expense (Details - Interest expense) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Obligation with Joint and Several Liability Arrangement [Line Items] |  |  |
Total interest expense | $ 101,338 | $ 110,528 | $ 101,466
Securitization Trust Debt [Member] |  |  |
Obligation with Joint and Several Liability Arrangement [Line Items] |  |  |
Total interest expense | 88,031 | 96,870 | 89,926
WarehouseLinesOfCreditMember |  |  |
Obligation with Joint and Several Liability Arrangement [Line Items] |  |  |
Total interest expense | 7,678 | 8,402 | 7,752
Residual interest financing [Member] |  |  |
Obligation with Joint and Several Liability Arrangement [Line Items] |  |  |
Total interest expense | 3,454 | 3,822 | 2,343
Subordinated renewable notes [Member] |  |  |
Obligation with Joint and Several Liability Arrangement [Line Items] |  |  |
Total interest expense | $ 2,175 | $ 1,434 | $ 1,445

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