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Principles of Consolidation - Assets and Liabilities of Consolidated Variable Interest Entity's (Details) $ in Thousands | Jun. 30, 2019 USD ($) investment | Dec. 31, 2018 USD ($) investment
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Assets | $ 7,937,685 | $ 6,331,191
Liabilities | $ 7,189,086 | $ 5,709,807
Number of VIEs | investment | 35 | 33
Residential loans, held-for-investment |  |
Variable Interest Entity [Line Items] |  |
Assets | $ 3,840,195 | $ 3,822,009
Multifamily loans, held-for-investment |  |
Variable Interest Entity [Line Items] |  |
Assets | 3,749,657 | 2,144,598
Other investments |  |
Variable Interest Entity [Line Items] |  |
Assets | 274,617 | 312,688
Cash and cash equivalents |  |
Variable Interest Entity [Line Items] |  |
Assets | 19,393 |
Restricted cash |  |
Variable Interest Entity [Line Items] |  |
Assets | 23,808 | 26,531
Accrued interest receivable |  |
Variable Interest Entity [Line Items] |  |
Assets | 28,567 | 21,422
REO |  |
Variable Interest Entity [Line Items] |  |
Assets | 1,448 | 3,943
Short-term debt |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 236,231 | 262,740
Accrued interest payable |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 21,758 | 17,380
Accrued expenses and other liabilities |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 17,968 | 19,614
Asset-backed securities issued |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 6,913,129 | 5,410,073
Legacy Sequoia |  |
Variable Interest Entity [Line Items] |  |
Assets | 460,113 | 524,869
Liabilities | $ 449,381 | $ 512,811
Number of VIEs | investment | 20 | 20
Legacy Sequoia | Residential loans, held-for-investment |  |
Variable Interest Entity [Line Items] |  |
Assets | $ 457,750 | $ 519,958
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 | 144 | 146
Legacy Sequoia | Accrued interest receivable |  |
Variable Interest Entity [Line Items] |  |
Assets | 771 | 822
Legacy Sequoia | REO |  |
Variable Interest Entity [Line Items] |  |
Assets | 1,448 | 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 | 519 | 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 | 448,862 | 512,240
Sequoia Choice |  |
Variable Interest Entity [Line Items] |  |
Assets | 2,156,316 | 2,089,392
Liabilities | $ 1,936,780 | $ 1,893,212
Number of VIEs | investment | 7 | 6
Sequoia Choice | Residential loans, held-for-investment |  |
Variable Interest Entity [Line Items] |  |
Assets | $ 2,147,356 | $ 2,079,382
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 | 14 | 1,022
Sequoia Choice | Accrued interest receivable |  |
Variable Interest Entity [Line Items] |  |
Assets | 8,946 | 8,988
Sequoia Choice | REO |  |
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 | 7,322 | 7,180
Sequoia Choice | Accrued expenses and other liabilities |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 14 | 1,022
Sequoia Choice | Asset-backed securities issued |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 1,929,444 | 1,885,010
Freddie Mac SLST |  |
Variable Interest Entity [Line Items] |  |
Assets | 1,238,875 | 1,226,595
Liabilities | $ 994,540 | $ 996,655
Number of VIEs | investment | 1 | 1
Freddie Mac SLST | Residential loans, held-for-investment |  |
Variable Interest Entity [Line Items] |  |
Assets | $ 1,235,089 | $ 1,222,669
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 | 3,786 | 3,926
Freddie Mac SLST | REO |  |
Variable Interest Entity [Line Items] |  |
Assets | 0 | 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 | 2,774 | 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 | 991,766 | 993,748
Freddie Mac K-Series |  |
Variable Interest Entity [Line Items] |  |
Assets | 3,760,974 | 2,151,193
Liabilities | $ 3,553,879 | $ 2,025,314
Number of VIEs | investment | 4 | 3
Freddie Mac K-Series | Residential loans, held-for-investment |  |
Variable Interest Entity [Line Items] |  |
Assets | $ 0 | $ 0
Freddie Mac K-Series | Multifamily loans, held-for-investment |  |
Variable Interest Entity [Line Items] |  |
Assets | 3,749,657 | 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 | 11,317 | 6,595
Freddie Mac K-Series | REO |  |
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 | 10,822 | 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 | 3,543,057 | 2,019,075
Servicing Investment |  |
Variable Interest Entity [Line Items] |  |
Assets | 321,407 | 339,142
Liabilities | $ 254,506 | $ 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 | Multifamily loans, held-for-investment |  |
Variable Interest Entity [Line Items] |  |
Assets | 0 | 0
Servicing Investment | Other investments |  |
Variable Interest Entity [Line Items] |  |
Assets | 274,617 | 312,688
Servicing Investment | Cash and cash equivalents |  |
Variable Interest Entity [Line Items] |  |
Assets | 19,393 |
Servicing Investment | Restricted cash |  |
Variable Interest Entity [Line Items] |  |
Assets | 23,650 | 25,363
Servicing Investment | Accrued interest receivable |  |
Variable Interest Entity [Line Items] |  |
Assets | 3,747 | 1,091
Servicing Investment | REO |  |
Variable Interest Entity [Line Items] |  |
Assets | 0 | 0
Servicing Investment | Short-term debt |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 236,231 | 262,740
Servicing Investment | Accrued interest payable |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 321 | 483
Servicing Investment | Accrued expenses and other liabilities |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 17,954 | 18,592
Servicing Investment | Asset-backed securities issued |  |
Variable Interest Entity [Line Items] |  |
Liabilities | $ 0 | $ 0

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