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Loans Held-for-Investment, Net of Allowance for Credit Losses - Internal Risk Rating (Details)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
loan
Dec. 31, 2022
USD ($)
loan
Jun. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Jun. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Number of Loans | loan 77 90        
Unpaid Principal Balance $ 2,917,729 $ 3,362,006        
Loans held-for-investment, net 2,763,558 3,267,815 $ 2,966,088 $ 3,520,405 $ 3,830,014 $ 3,741,308
Current year 0 419,617        
Year one 431,022 607,587        
Year two 545,995 159,855        
Year three 65,860 1,094,359        
Year four 986,298 485,873        
Prior 734,383 500,524        
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]            
Year one 0 0        
Year two 0 0        
Year three 0 0        
Year four 0 0        
Year five 0 0        
Prior (20,950) 0        
Total $ (20,950) $ 0        
Risk Rating 1            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Number of Loans | loan 5 8        
Unpaid Principal Balance $ 134,655 $ 291,236        
Loans held-for-investment, net 133,874 287,527        
Current year 0 0        
Year one 0 0        
Year two 62,992 44,141        
Year three 21,715 186,506        
Year four 49,167 56,880        
Prior $ 0 $ 0        
Risk Rating 2            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Number of Loans | loan 40 52        
Unpaid Principal Balance $ 1,419,862 $ 1,857,744        
Loans held-for-investment, net 1,391,937 1,824,564        
Current year 0 419,617        
Year one 405,438 512,526        
Year two 339,076 95,560        
Year three 21,948 516,723        
Year four 522,000 193,900        
Prior $ 103,475 $ 86,238        
Risk Rating 3            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Number of Loans | loan 23 21        
Unpaid Principal Balance $ 784,320 $ 697,532        
Loans held-for-investment, net 767,944 689,196        
Current year 0 0        
Year one 25,584 95,061        
Year two 143,927 20,154        
Year three 22,197 234,019        
Year four 217,849 99,311        
Prior $ 358,387 $ 240,651        
Risk Rating 4            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Number of Loans | loan 5 5        
Unpaid Principal Balance $ 328,023 $ 268,236        
Loans held-for-investment, net 303,941 258,570        
Current year 0 0        
Year one 0 0        
Year two 0 0        
Year three 0 0        
Year four 74,170 135,782        
Prior $ 229,771 $ 122,788        
Risk Rating 5            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Number of Loans | loan 4 4        
Unpaid Principal Balance $ 250,869 $ 247,258        
Loans held-for-investment, net 165,862 207,958        
Current year 0 0        
Year one 0 0        
Year two 0 0        
Year three 0 157,111        
Year four 123,112 0        
Prior $ 42,750 $ 50,847