(8) Interest Income and Interest Expense (Details - Interest expense) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Obligation with Joint and Several Liability Arrangement [Line Items]
Total interest expense	$ 101,338	$ 110,528	$ 101,466
Securitization Trust Debt [Member]
Obligation with Joint and Several Liability Arrangement [Line Items]
Total interest expense	88,031	96,870	89,926
WarehouseLinesOfCreditMember
Obligation with Joint and Several Liability Arrangement [Line Items]
Total interest expense	7,678	8,402	7,752
Residual interest financing [Member]
Obligation with Joint and Several Liability Arrangement [Line Items]
Total interest expense	3,454	3,822	2,343
Subordinated renewable notes [Member]
Obligation with Joint and Several Liability Arrangement [Line Items]
Total interest expense	$ 2,175	$ 1,434	$ 1,445