(5) Interest Income and Interest Expense (Details - Interest expense) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
ComponentsOfInterestExpenseLineItems [Line Items]
Total interest expense	$ 20,946	$ 26,991
Securitization Trust Debt [Member]
ComponentsOfInterestExpenseLineItems [Line Items]
Total interest expense	18,453	23,798
Warehouse Lines Of Credit [Member]
ComponentsOfInterestExpenseLineItems [Line Items]
Total interest expense	1,314	1,763
Residual interest financing [Member]
ComponentsOfInterestExpenseLineItems [Line Items]
Total interest expense	566	938
Subordinated renewable notes [Member]
ComponentsOfInterestExpenseLineItems [Line Items]
Total interest expense	$ 613	$ 492