(8) Interest Income and Interest Expense (Details - Interest expense) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total interest expense	$ 75,239	$ 101,338	$ 110,528
Securitization Trust Debt [Member]
Debt Instrument [Line Items]
Total interest expense	64,387	88,031	96,870
Warehouse Lines Of Credit [Member]
Debt Instrument [Line Items]
Total interest expense	4,448	7,678	8,402
Residual interest financing [Member]
Debt Instrument [Line Items]
Total interest expense	3,763	3,454	3,822
Subordinated renewable notes [Member]
Debt Instrument [Line Items]
Total interest expense	$ 2,641	$ 2,175	$ 1,434