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Loans Held-for-Investment - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Nov. 09, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for loan losses $ 66,666   $ 16,692  
Liability for off balance sheet credit losses $ 5,500   0  
Threshold period when delinquent loans are placed on nonaccrual status 90 days      
Unpaid principal balance $ 3,932,434   4,257,145  
Carrying value 3,847,803   4,226,212  
Loans held-for-investment pledged as collateral for borrowings 3,800,000   4,100,000  
Loans held-for-investment, net of allowance for credit losses 3,847,803   4,226,212 $ 3,167,913
Cumulative effect of adoption of new accounting principle        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for loan losses 8,100      
Liability for off balance sheet credit losses     1,780  
First Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for loan losses 60,130      
Unpaid principal balance 3,915,833 $ 40,000 4,229,194  
Carrying value 3,837,738   $ 4,198,282  
Non-Accrual Loan        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Unpaid principal balance 22,300      
Carrying value 17,800      
Allowance for loan and lease losses, write-offs $ 800