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Principles of Consolidation - Assets and Liabilities of Consolidated Variable Interest Entity's (Details) $ in Thousands | Dec. 31, 2019 USD ($) investment | Dec. 31, 2018 USD ($) investment
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Assets | $ 11,931,869 | $ 6,331,191
Liabilities | $ 10,717,072 | $ 5,709,807
Number of VIEs | investment | 49 | 33
Residential loans, held-for-investment |  |
Variable Interest Entity [Line Items] |  |
Assets | $ 5,066,568 | $ 3,822,009
Business purpose residential loans, held-for-investment |  |
Variable Interest Entity [Line Items] |  |
Assets | 2,192,552 |
Multifamily loans, held-for-investment |  |
Variable Interest Entity [Line Items] |  |
Assets | 4,408,524 | 2,144,598
Other investments |  |
Variable Interest Entity [Line Items] |  |
Assets | 184,802 | 312,688
Cash and cash equivalents |  |
Variable Interest Entity [Line Items] |  |
Assets | 9,015 |
Restricted cash |  |
Variable Interest Entity [Line Items] |  |
Assets | 21,936 | 26,531
Accrued interest receivable |  |
Variable Interest Entity [Line Items] |  |
Assets | 45,772 | 21,422
Other assets |  |
Variable Interest Entity [Line Items] |  |
Assets | 2,700 | 3,943
Short-term debt |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 152,554 | 262,740
Accrued interest payable |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 34,060 | 17,380
Accrued expenses and other liabilities |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 14,983 | 19,614
Asset-backed securities issued |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 10,515,475 | 5,410,073
Legacy Sequoia |  |
Variable Interest Entity [Line Items] |  |
Assets | 409,148 | 524,869
Liabilities | $ 402,860 | $ 512,811
Number of VIEs | investment | 20 | 20
Legacy Sequoia | Residential loans, held-for-investment |  |
Variable Interest Entity [Line Items] |  |
Assets | $ 407,890 | $ 519,958
Legacy Sequoia | Business purpose residential loans, held-for-investment |  |
Variable Interest Entity [Line Items] |  |
Assets | 0 |
Legacy Sequoia | Multifamily loans, held-for-investment |  |
Variable Interest Entity [Line Items] |  |
Assets | 0 | 0
Legacy Sequoia | Other investments |  |
Variable Interest Entity [Line Items] |  |
Assets | 0 | 0
Legacy Sequoia | Cash and cash equivalents |  |
Variable Interest Entity [Line Items] |  |
Assets | 0 |
Legacy Sequoia | Restricted cash |  |
Variable Interest Entity [Line Items] |  |
Assets | 143 | 146
Legacy Sequoia | Accrued interest receivable |  |
Variable Interest Entity [Line Items] |  |
Assets | 655 | 822
Legacy Sequoia | Other assets |  |
Variable Interest Entity [Line Items] |  |
Assets | 460 | 3,943
Legacy Sequoia | Short-term debt |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 0 | 0
Legacy Sequoia | Accrued interest payable |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 395 | 571
Legacy Sequoia | Accrued expenses and other liabilities |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 0 | 0
Legacy Sequoia | Asset-backed securities issued |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 402,465 | 512,240
Sequoia Choice |  |
Variable Interest Entity [Line Items] |  |
Assets | 2,301,314 | 2,089,392
Liabilities | $ 2,044,957 | $ 1,893,212
Number of VIEs | investment | 9 | 6
Sequoia Choice | Residential loans, held-for-investment |  |
Variable Interest Entity [Line Items] |  |
Assets | $ 2,291,463 | $ 2,079,382
Sequoia Choice | Business purpose residential loans, held-for-investment |  |
Variable Interest Entity [Line Items] |  |
Assets | 0 |
Sequoia Choice | Multifamily loans, held-for-investment |  |
Variable Interest Entity [Line Items] |  |
Assets | 0 | 0
Sequoia Choice | Other investments |  |
Variable Interest Entity [Line Items] |  |
Assets | 0 | 0
Sequoia Choice | Cash and cash equivalents |  |
Variable Interest Entity [Line Items] |  |
Assets | 0 |
Sequoia Choice | Restricted cash |  |
Variable Interest Entity [Line Items] |  |
Assets | 27 | 1,022
Sequoia Choice | Accrued interest receivable |  |
Variable Interest Entity [Line Items] |  |
Assets | 9,824 | 8,988
Sequoia Choice | Other assets |  |
Variable Interest Entity [Line Items] |  |
Assets | 0 | 0
Sequoia Choice | Short-term debt |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 0 | 0
Sequoia Choice | Accrued interest payable |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 7,732 | 7,180
Sequoia Choice | Accrued expenses and other liabilities |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 27 | 1,022
Sequoia Choice | Asset-backed securities issued |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 2,037,198 | 1,885,010
Freddie Mac SLST |  |
Variable Interest Entity [Line Items] |  |
Assets | 2,374,973 | 1,226,595
Liabilities | $ 1,923,696 | $ 996,655
Number of VIEs | investment | 2 | 1
Freddie Mac SLST | Residential loans, held-for-investment |  |
Variable Interest Entity [Line Items] |  |
Assets | $ 2,367,215 | $ 1,222,669
Freddie Mac SLST | Business purpose residential loans, held-for-investment |  |
Variable Interest Entity [Line Items] |  |
Assets | 0 |
Freddie Mac SLST | Multifamily loans, held-for-investment |  |
Variable Interest Entity [Line Items] |  |
Assets | 0 | 0
Freddie Mac SLST | Other investments |  |
Variable Interest Entity [Line Items] |  |
Assets | 0 | 0
Freddie Mac SLST | Cash and cash equivalents |  |
Variable Interest Entity [Line Items] |  |
Assets | 0 |
Freddie Mac SLST | Restricted cash |  |
Variable Interest Entity [Line Items] |  |
Assets | 0 | 0
Freddie Mac SLST | Accrued interest receivable |  |
Variable Interest Entity [Line Items] |  |
Assets | 7,313 | 3,926
Freddie Mac SLST | Other assets |  |
Variable Interest Entity [Line Items] |  |
Assets | 445 | 0
Freddie Mac SLST | Short-term debt |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 0 | 0
Freddie Mac SLST | Accrued interest payable |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 5,374 | 2,907
Freddie Mac SLST | Accrued expenses and other liabilities |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 0 | 0
Freddie Mac SLST | Asset-backed securities issued |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 1,918,322 | 993,748
Freddie Mac K-Series |  |
Variable Interest Entity [Line Items] |  |
Assets | 4,422,063 | 2,151,193
Liabilities | $ 4,169,126 | $ 2,025,314
Number of VIEs | investment | 5 | 3
Freddie Mac K-Series | Residential loans, held-for-investment |  |
Variable Interest Entity [Line Items] |  |
Assets | $ 0 | $ 0
Freddie Mac K-Series | Business purpose residential loans, held-for-investment |  |
Variable Interest Entity [Line Items] |  |
Assets | 0 |
Freddie Mac K-Series | Multifamily loans, held-for-investment |  |
Variable Interest Entity [Line Items] |  |
Assets | 4,408,524 | 2,144,598
Freddie Mac K-Series | Other investments |  |
Variable Interest Entity [Line Items] |  |
Assets | 0 | 0
Freddie Mac K-Series | Cash and cash equivalents |  |
Variable Interest Entity [Line Items] |  |
Assets | 0 |
Freddie Mac K-Series | Restricted cash |  |
Variable Interest Entity [Line Items] |  |
Assets | 0 | 0
Freddie Mac K-Series | Accrued interest receivable |  |
Variable Interest Entity [Line Items] |  |
Assets | 13,539 | 6,595
Freddie Mac K-Series | Other assets |  |
Variable Interest Entity [Line Items] |  |
Assets | 0 | 0
Freddie Mac K-Series | Short-term debt |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 0 | 0
Freddie Mac K-Series | Accrued interest payable |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 12,887 | 6,239
Freddie Mac K-Series | Accrued expenses and other liabilities |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 0 | 0
Freddie Mac K-Series | Asset-backed securities issued |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 4,156,239 | 2,019,075
CAFL |  |
Variable Interest Entity [Line Items] |  |
Assets | 2,203,919 | 0
Liabilities | $ 2,008,736 | $ 0
Number of VIEs | investment | 10 | 0
CAFL | Residential loans, held-for-investment |  |
Variable Interest Entity [Line Items] |  |
Assets | $ 0 | $ 0
CAFL | Business purpose residential loans, held-for-investment |  |
Variable Interest Entity [Line Items] |  |
Assets | 2,192,552 |
CAFL | Multifamily loans, held-for-investment |  |
Variable Interest Entity [Line Items] |  |
Assets | 0 | 0
CAFL | Other investments |  |
Variable Interest Entity [Line Items] |  |
Assets | 0 | 0
CAFL | Cash and cash equivalents |  |
Variable Interest Entity [Line Items] |  |
Assets | 0 |
CAFL | Restricted cash |  |
Variable Interest Entity [Line Items] |  |
Assets | 0 | 0
CAFL | Accrued interest receivable |  |
Variable Interest Entity [Line Items] |  |
Assets | 9,572 | 0
CAFL | Other assets |  |
Variable Interest Entity [Line Items] |  |
Assets | 1,795 | 0
CAFL | Short-term debt |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 0 | 0
CAFL | Accrued interest payable |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 7,485 | 0
CAFL | Accrued expenses and other liabilities |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 0 | 0
CAFL | Asset-backed securities issued |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 2,001,251 | 0
Servicing Investment |  |
Variable Interest Entity [Line Items] |  |
Assets | 220,452 | 339,142
Liabilities | $ 167,697 | $ 281,815
Number of VIEs | investment | 3 | 3
Servicing Investment | Residential loans, held-for-investment |  |
Variable Interest Entity [Line Items] |  |
Assets | $ 0 | $ 0
Servicing Investment | Business purpose residential loans, held-for-investment |  |
Variable Interest Entity [Line Items] |  |
Assets | 0 |
Servicing Investment | Multifamily loans, held-for-investment |  |
Variable Interest Entity [Line Items] |  |
Assets | 0 | 0
Servicing Investment | Other investments |  |
Variable Interest Entity [Line Items] |  |
Assets | 184,802 | 312,688
Servicing Investment | Cash and cash equivalents |  |
Variable Interest Entity [Line Items] |  |
Assets | 9,015 |
Servicing Investment | Restricted cash |  |
Variable Interest Entity [Line Items] |  |
Assets | 21,766 | 25,363
Servicing Investment | Accrued interest receivable |  |
Variable Interest Entity [Line Items] |  |
Assets | 4,869 | 1,091
Servicing Investment | Other assets |  |
Variable Interest Entity [Line Items] |  |
Assets | 0 | 0
Servicing Investment | Short-term debt |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 152,554 | 262,740
Servicing Investment | Accrued interest payable |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 187 | 483
Servicing Investment | Accrued expenses and other liabilities |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 14,956 | 18,592
Servicing Investment | Asset-backed securities issued |  |
Variable Interest Entity [Line Items] |  |
Liabilities | $ 0 | $ 0

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