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Asset-Backed Securities Issued - Summary of Carrying Value Components of Collateral for Asset-Backed Securities Issued and Outstanding (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | $ 11,711,417 | $ 5,992,049
Residential loans |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 5,066,568 | 3,822,009
Business purpose residential loans |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 2,192,552 |
Multifamily loans |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 4,408,524 | 2,144,598
Restricted cash |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 170 | 1,168
Accrued interest receivable |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 40,903 | 20,331
REO |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 2,700 | 3,943
Legacy Sequoia |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 409,148 | 524,869
Legacy Sequoia | Residential loans |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 407,890 | 519,958
Legacy Sequoia | Business purpose residential loans |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 0 |
Legacy Sequoia | Multifamily loans |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 0 | 0
Legacy Sequoia | Restricted cash |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 143 | 146
Legacy Sequoia | Accrued interest receivable |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 655 | 822
Legacy Sequoia | REO |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 460 | 3,943
Sequoia Choice |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 2,301,314 | 2,089,392
Sequoia Choice | Residential loans |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 2,291,463 | 2,079,382
Sequoia Choice | Business purpose residential loans |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 0 |
Sequoia Choice | Multifamily loans |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 0 | 0
Sequoia Choice | Restricted cash |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 27 | 1,022
Sequoia Choice | Accrued interest receivable |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 9,824 | 8,988
Sequoia Choice | REO |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 0 | 0
Freddie Mac SLST |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 2,374,973 | 1,226,595
Freddie Mac SLST | Residential loans |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 2,367,215 | 1,222,669
Freddie Mac SLST | Business purpose residential loans |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 0 |
Freddie Mac SLST | Multifamily loans |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 0 | 0
Freddie Mac SLST | Restricted cash |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 0 | 0
Freddie Mac SLST | Accrued interest receivable |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 7,313 | 3,926
Freddie Mac SLST | REO |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 445 | 0
Freddie Mac K-Series |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 4,422,063 | 2,151,193
Freddie Mac K-Series | Residential loans |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 0 | 0
Freddie Mac K-Series | Business purpose residential loans |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 0 |
Freddie Mac K-Series | Multifamily loans |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 4,408,524 | 2,144,598
Freddie Mac K-Series | Restricted cash |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 0 | 0
Freddie Mac K-Series | Accrued interest receivable |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 13,539 | 6,595
Freddie Mac K-Series | REO |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 0 | 0
CAFL |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 2,203,919 | 0
CAFL | Residential loans |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 0 | 0
CAFL | Business purpose residential loans |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 2,192,552 |
CAFL | Multifamily loans |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 0 | 0
CAFL | Restricted cash |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 0 | 0
CAFL | Accrued interest receivable |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 9,572 | 0
CAFL | REO |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | $ 1,795 | $ 0

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