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Short-Term Debt - Additional Information (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Short-term Debt [Line Items]      
Average balance of short-term debt $ 1,740,000,000 $ 1,610,000,000  
Accrued interest payable on short-term debt 4,000,000   $ 6,000,000
Committed line of credit 10,000,000    
Fair value of mortgage backed securities securing loan (in excess) 3,000,000    
Committed line of credit with financial institutions, outstanding 0   0
Sequoia securities | Sequoia Choice | Short Term Borrowing Agreement      
Short-term Debt [Line Items]      
Trading securities pledged as collateral 51,026,000   111,341,000
Sequoia securities | Freddie Mac SLST | Short Term Borrowing Agreement      
Short-term Debt [Line Items]      
Trading securities pledged as collateral 307,175,000   381,640,000
Sequoia securities | Freddie Mac K-Series | Short Term Borrowing Agreement      
Short-term Debt [Line Items]      
Trading securities pledged as collateral 22,785,000   252,284,000
Residential Loans      
Short-term Debt [Line Items]      
Fair value of servicer advances, cash and restricted cash 297,000,000    
Residential Loans      
Short-term Debt [Line Items]      
Loan pledged as collateral 881,607,000   $ 201,949,000
Servicer advance financing      
Short-term Debt [Line Items]      
Collateral amounts 283,000,000    
Accrued interest payable on short-term debt 200,000    
Unamortized capitalized commitment costs $ (1,000,000)