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Loans Held for Investment and Loans Held for Investment at Fair Value - Schedule of Loans Held for Investment Pledged as Collateral for Warehouse Facilities and Securitizations Issued (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Accounts Notes And Loans Receivable [Line Items]    
Total pledged loans $ 345,445 $ 91,074
Total 1,908,689 1,852,554
2013 Repurchase Agreement    
Accounts Notes And Loans Receivable [Line Items]    
Total pledged loans 101,711 91,074
2015 Repurchase Agreement    
Accounts Notes And Loans Receivable [Line Items]    
Total pledged loans 176,156  
Bank Credit Agreement    
Accounts Notes And Loans Receivable [Line Items]    
Total pledged loans 40,082  
2021 Repurchase Agreement    
Accounts Notes And Loans Receivable [Line Items]    
Total pledged loans 27,496  
2014-1 Trust    
Accounts Notes And Loans Receivable [Line Items]    
Total 18,813 22,228
2015-1 Trust    
Accounts Notes And Loans Receivable [Line Items]    
Total 36,163 48,179
2016-1 Trust    
Accounts Notes And Loans Receivable [Line Items]    
Total 56,998 71,271
2016-2 Trust    
Accounts Notes And Loans Receivable [Line Items]    
Total 34,755 47,282
2017-1 Trust    
Accounts Notes And Loans Receivable [Line Items]    
Total 60,506 81,376
2017-2 Trust    
Accounts Notes And Loans Receivable [Line Items]    
Total 104,385 137,970
2018-1 Trust    
Accounts Notes And Loans Receivable [Line Items]    
Total 79,352 112,042
2018-2 Trust    
Accounts Notes And Loans Receivable [Line Items]    
Total 174,205 224,195
2019-1 Trust    
Accounts Notes And Loans Receivable [Line Items]    
Total 162,726 203,144
2019-2 Trust    
Accounts Notes And Loans Receivable [Line Items]    
Total 143,020 175,560
2019-3 Trust    
Accounts Notes And Loans Receivable [Line Items]    
Total 112,630 135,527
2020-1 Trust    
Accounts Notes And Loans Receivable [Line Items]    
Total 203,442 241,664
2020-2 Trust    
Accounts Notes And Loans Receivable [Line Items]    
Total 105,636 123,646
2020-MC1 Trust    
Accounts Notes And Loans Receivable [Line Items]    
Total 155,669 $ 228,470
2021-1 Trust    
Accounts Notes And Loans Receivable [Line Items]    
Total 256,682  
2021-2 Trust    
Accounts Notes And Loans Receivable [Line Items]    
Total $ 203,707