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8. Interest Income and Interest Expense (Details - Interest expense) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Total interest expense $ 92,345 $ 79,941 $ 57,745
Securitization Trust Debt [Member]      
Total interest expense 83,084 69,178 48,631
Warehouse Lines Of Credit [Member]      
Total interest expense 7,933 8,569 6,127
Residual interest financing [Member]      
Total interest expense 0 846 1,405
Subordinated Renewable Notes [Member]      
Total interest expense $ 1,328 $ 1,348 $ 1,582