5. Interest Income and Interest Expense (Details - Interest expense) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Total interest expense	$ 27,703	$ 25,187	$ 54,993	$ 49,249
Securitization Trust Debt [Member]
Total interest expense	24,466	22,255	48,454	44,084
Warehouse Lines of Credit [Member]
Total interest expense	1,960	2,135	3,980	4,023
Residual interest financing [Member]
Total interest expense	955	452	1,911	452
Subordinated renewable notes [Member]
Total interest expense	$ 322	$ 345	$ 648	$ 690