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Principles of Consolidation - Assets and Liabilities of Consolidated Variable Interest Entity's (Details) $ in Thousands		3 Months Ended
	Dec. 31, 2018 USD ($) investment	Mar. 31, 2019 USD ($) investment
Variable Interest Entity [Line Items]
Assets	$ 6,331,191	$ 6,585,881
Liabilities	$ 5,709,807	$ 5,925,677
Number of VIEs | investment	33	34
Residential loans, held-for-investment
Variable Interest Entity [Line Items]
Assets	$ 3,822,009	$ 4,050,210
Multifamily loans, held-for-investment
Variable Interest Entity [Line Items]
Assets	2,144,598	2,175,899
Other investments
Variable Interest Entity [Line Items]
Assets	312,688	318,677
Cash and cash equivalents
Variable Interest Entity [Line Items]
Assets		11,375
Restricted cash
Variable Interest Entity [Line Items]
Assets	26,531	3,349
Accrued interest receivable
Variable Interest Entity [Line Items]
Assets	21,422	24,091
REO
Variable Interest Entity [Line Items]
Assets	3,943	2,280
Short-term debt
Variable Interest Entity [Line Items]
Liabilities	262,740	249,557
Accrued interest payable
Variable Interest Entity [Line Items]
Liabilities	17,380	17,864
Accrued expenses and other liabilities
Variable Interest Entity [Line Items]
Liabilities	19,614	20,612
Asset-backed securities issued
Variable Interest Entity [Line Items]
Liabilities	5,410,073	5,637,644
Legacy Sequoia
Variable Interest Entity [Line Items]
Assets	524,869	491,847
Liabilities	$ 512,811	$ 480,530
Number of VIEs | investment	20	20
Legacy Sequoia | Residential loans, held-for-investment
Variable Interest Entity [Line Items]
Assets	$ 519,958	$ 488,645
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	146	146
Legacy Sequoia | Accrued interest receivable
Variable Interest Entity [Line Items]
Assets	822	776
Legacy Sequoia | REO
Variable Interest Entity [Line Items]
Assets	3,943	2,280
Legacy Sequoia | Short-term debt
Variable Interest Entity [Line Items]
Liabilities	0	0
Legacy Sequoia | Accrued interest payable
Variable Interest Entity [Line Items]
Liabilities	571	531
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	512,240	479,999
Sequoia Choice
Variable Interest Entity [Line Items]
Assets	2,089,392	2,342,878
Liabilities	$ 1,893,212	$ 2,125,224
Number of VIEs | investment	6	7
Sequoia Choice | Residential loans, held-for-investment
Variable Interest Entity [Line Items]
Assets	$ 2,079,382	$ 2,333,248
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	1,022	14
Sequoia Choice | Accrued interest receivable
Variable Interest Entity [Line Items]
Assets	8,988	9,616
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	7,180	7,854
Sequoia Choice | Accrued expenses and other liabilities
Variable Interest Entity [Line Items]
Liabilities	1,022	14
Sequoia Choice | Asset-backed securities issued
Variable Interest Entity [Line Items]
Liabilities	1,885,010	2,117,356
Freddie Mac SLST
Variable Interest Entity [Line Items]
Assets	1,226,595	1,232,178
Liabilities	$ 996,655	$ 995,878
Number of VIEs | investment	1	1
Freddie Mac SLST | Residential loans, held-for-investment
Variable Interest Entity [Line Items]
Assets	$ 1,222,669	$ 1,228,317
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	3,926	3,861
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	2,907	2,846
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	993,748	993,032
Freddie Mac K-Series
Variable Interest Entity [Line Items]
Assets	2,151,193	2,182,486
Liabilities	$ 2,025,314	$ 2,053,487
Number of VIEs | investment	3	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	2,144,598	2,175,899
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	6,595	6,587
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	6,239	6,230
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	2,019,075	2,047,257
Servicing Investment
Variable Interest Entity [Line Items]
Assets	339,142	336,492
Liabilities	$ 281,815	$ 270,558
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	312,688	318,677
Servicing Investment | Cash and cash equivalents
Variable Interest Entity [Line Items]
Assets		11,375
Servicing Investment | Restricted cash
Variable Interest Entity [Line Items]
Assets	25,363	3,189
Servicing Investment | Accrued interest receivable
Variable Interest Entity [Line Items]
Assets	1,091	3,251
Servicing Investment | REO
Variable Interest Entity [Line Items]
Assets	0	0
Servicing Investment | Short-term debt
Variable Interest Entity [Line Items]
Liabilities	262,740	249,557
Servicing Investment | Accrued interest payable
Variable Interest Entity [Line Items]
Liabilities	483	403
Servicing Investment | Accrued expenses and other liabilities
Variable Interest Entity [Line Items]
Liabilities	18,592	20,598
Servicing Investment | Asset-backed securities issued
Variable Interest Entity [Line Items]
Liabilities	$ 0	$ 0

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Number of Variable Interest Entities, Acquired and Consolidated

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