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Business Segment Reporting - Schedule of Depreciation and Amortization by Segment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]      
Depreciation expense $ 10,265 $ 19,121 $ 31,911
Amortization of debt discount and issuance costs 7,792 6,992 4,512
Servicing      
Segment Reporting Information [Line Items]      
Depreciation expense 674 857 1,925
Amortization of debt discount and issuance costs 687 470 71
Originations      
Segment Reporting Information [Line Items]      
Depreciation expense 244 128 93
Amortization of debt discount and issuance costs 0 0 0
Corporate Items and Other      
Segment Reporting Information [Line Items]      
Depreciation expense 9,347 18,136 29,893
Amortization of debt discount and issuance costs $ 7,105 $ 6,522 $ 4,441