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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Total interest expense | $ 110,528 | $ 101,466 | $ 92,345
Securitization Trust Debt [Member] |  |  |
Total interest expense | 96,870 | 89,926 | 83,084
Warehouse Lines Of Credit [Member] |  |  |
Total interest expense | 8,402 | 7,752 | 7,933
Residual interest financing [Member] |  |  |
Total interest expense | 3,822 | 2,343 | 0
Subordinated Renewable Notes [Member] |  |  |
Total interest expense | $ 1,434 | $ 1,445 | $ 1,328

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