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8. Interest Income and Interest Expense (Details - Interest expense) - USD ($)
$ in Thousands
 12 Months Ended
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