(8) Interest Income and Interest Expense (Details - Interest expense) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total interest expense	$ 87,524	$ 75,239	$ 101,338
Securitization Trust Debt [Member]
Debt Instrument [Line Items]
Total interest expense	70,627	64,387	88,031
Warehouse Lines Of Credit [Member]
Debt Instrument [Line Items]
Total interest expense	10,310	4,448	7,678
Residual interest financing [Member]
Debt Instrument [Line Items]
Total interest expense	4,243	3,763	3,454
Subordinated renewable notes [Member]
Debt Instrument [Line Items]
Total interest expense	$ 2,344	$ 2,641	$ 2,175