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(5) Interest Income and Interest Expense (Details - Interest expense) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Securities Financing Transaction [Line Items]        
Total interest expense $ 18,980 $ 26,485 $ 39,925 $ 53,476
Securitization Trust Debt [Member]        
Securities Financing Transaction [Line Items]        
Total interest expense 16,823 22,367 35,276 46,165
Warehouse Lines Of Credit [Member]        
Securities Financing Transaction [Line Items]        
Total interest expense 1,021 2,675 2,335 4,437
Residual interest financing [Member]        
Securities Financing Transaction [Line Items]        
Total interest expense 467 920 1,033 1,857
Subordinated renewable notes [Member]        
Securities Financing Transaction [Line Items]        
Total interest expense $ 669 $ 523 $ 1,281 $ 1,017