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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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Number of Variable Interest Entities, Acquired and Consolidated

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