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Principles of Consolidation - Assets and Liabilities of Consolidated Variable Interest Entity's (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) Investment	Dec. 31, 2017 USD ($) Investment
Variable Interest Entity [Line Items]
Assets	$ 6,331,191	$ 1,259,774
Liabilities	5,709,807	1,167,157
Multifamily loans, held-for-investment
Variable Interest Entity [Line Items]
Assets	2,144,598
Legacy Sequoia
Variable Interest Entity [Line Items]
Assets	524,869	637,184
Liabilities	$ 512,811	$ 622,982
Number of VIEs | Investment	20	20
Legacy Sequoia | Residential loans, held-for-investment
Variable Interest Entity [Line Items]
Assets	$ 519,958	$ 632,817
Legacy Sequoia | Multifamily loans, held-for-investment
Variable Interest Entity [Line Items]
Assets	0
Legacy Sequoia | Other investments
Variable Interest Entity [Line Items]
Assets	0
Legacy Sequoia | Restricted cash
Variable Interest Entity [Line Items]
Assets	146	147
Legacy Sequoia | Accrued interest receivable
Variable Interest Entity [Line Items]
Assets	822	867
Legacy Sequoia | REO
Variable Interest Entity [Line Items]
Assets	3,943	3,353
Legacy Sequoia | Short-term debt
Variable Interest Entity [Line Items]
Liabilities	0
Legacy Sequoia | Accrued interest payable
Variable Interest Entity [Line Items]
Liabilities	571	537
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	622,445
Sequoia Choice
Variable Interest Entity [Line Items]
Assets	2,089,392	622,590
Liabilities	$ 1,893,212	$ 544,175
Number of VIEs | Investment	6	2
Sequoia Choice | Residential loans, held-for-investment
Variable Interest Entity [Line Items]
Assets	$ 2,079,382	$ 620,062
Sequoia Choice | Multifamily loans, held-for-investment
Variable Interest Entity [Line Items]
Assets	0
Sequoia Choice | Other investments
Variable Interest Entity [Line Items]
Assets	0
Sequoia Choice | Restricted cash
Variable Interest Entity [Line Items]
Assets	1,022	4
Sequoia Choice | Accrued interest receivable
Variable Interest Entity [Line Items]
Assets	8,988	2,524
Sequoia Choice | REO
Variable Interest Entity [Line Items]
Assets	0	0
Sequoia Choice | Short-term debt
Variable Interest Entity [Line Items]
Liabilities	0
Sequoia Choice | Accrued interest payable
Variable Interest Entity [Line Items]
Liabilities	7,180	2,031
Sequoia Choice | Accrued expenses and other liabilities
Variable Interest Entity [Line Items]
Liabilities	1,022	4
Sequoia Choice | Asset-backed securities issued
Variable Interest Entity [Line Items]
Liabilities	1,885,010	542,140
Freddie Mac SLST
Variable Interest Entity [Line Items]
Assets	1,226,595	0
Liabilities	$ 996,655	$ 0
Number of VIEs | Investment	1	0
Freddie Mac SLST | Residential loans, held-for-investment
Variable Interest Entity [Line Items]
Assets	$ 1,222,669	$ 0
Freddie Mac SLST | Multifamily loans, held-for-investment
Variable Interest Entity [Line Items]
Assets	0
Freddie Mac SLST | Other investments
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	0
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
Freddie Mac SLST | Accrued interest payable
Variable Interest Entity [Line Items]
Liabilities	2,907	0
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	0
Freddie Mac K-Series
Variable Interest Entity [Line Items]
Assets	2,151,193	0
Liabilities	$ 2,025,314	$ 0
Number of VIEs | Investment	3	0
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
Freddie Mac K-Series | Other investments
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	0
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
Freddie Mac K-Series | Accrued interest payable
Variable Interest Entity [Line Items]
Liabilities	6,239	0
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	0
Servicing Investment
Variable Interest Entity [Line Items]
Assets	339,142	0
Liabilities	$ 281,815	$ 0
Number of VIEs | Investment	3	0
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
Servicing Investment | Other investments
Variable Interest Entity [Line Items]
Assets	312,688
Servicing Investment | Restricted cash
Variable Interest Entity [Line Items]
Assets	25,363	0
Servicing Investment | Accrued interest receivable
Variable Interest Entity [Line Items]
Assets	1,091	0
Servicing Investment | REO
Variable Interest Entity [Line Items]
Assets	0	0
Servicing Investment | Short-term debt
Variable Interest Entity [Line Items]
Liabilities	262,740
Servicing Investment | Accrued interest payable
Variable Interest Entity [Line Items]
Liabilities	483	0
Servicing Investment | Accrued expenses and other liabilities
Variable Interest Entity [Line Items]
Liabilities	18,592	0
Servicing Investment | Asset-backed securities issued
Variable Interest Entity [Line Items]
Liabilities	0	0
Total Consolidated VIEs
Variable Interest Entity [Line Items]
Assets	6,331,191	1,259,774
Liabilities	$ 5,709,807	$ 1,167,157
Number of VIEs | Investment	33	22
Total Consolidated VIEs | Residential loans, held-for-investment
Variable Interest Entity [Line Items]
Assets	$ 3,822,009	$ 1,252,879
Total Consolidated VIEs | Other investments
Variable Interest Entity [Line Items]
Assets	312,688
Total Consolidated VIEs | Restricted cash
Variable Interest Entity [Line Items]
Assets	26,531	151
Total Consolidated VIEs | Accrued interest receivable
Variable Interest Entity [Line Items]
Assets	21,422	3,391
Total Consolidated VIEs | REO
Variable Interest Entity [Line Items]
Assets	3,943	3,353
Total Consolidated VIEs | Short-term debt
Variable Interest Entity [Line Items]
Liabilities	262,740
Total Consolidated VIEs | Accrued interest payable
Variable Interest Entity [Line Items]
Liabilities	17,380	2,568
Total Consolidated VIEs | Accrued expenses and other liabilities
Variable Interest Entity [Line Items]
Liabilities	19,614	4
Total Consolidated VIEs | Asset-backed securities issued
Variable Interest Entity [Line Items]
Liabilities	$ 5,410,073	$ 1,164,585

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-Publisher FASB
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-Topic 810
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