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8. Interest Income and Interest Expense (Details - Interest expense) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Total interest expense $ 101,466 $ 92,345 $ 79,941
Securitization Trust Debt [Member]      
Total interest expense 89,926 83,084 69,178
Warehouse Lines Of Credit [Member]      
Total interest expense 7,752 7,933 8,569
Residual interest financing [Member]      
Total interest expense 2,343 0 846
Subordinated Renewable Notes [Member]      
Total interest expense $ 1,445 $ 1,328 $ 1,348