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Principles of Consolidation - Assets and Liabilities of Consolidated Variable Interest Entity's (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018 USD ($) Investment	Dec. 31, 2017 USD ($) Investment
Variable Interest Entity [Line Items]
Assets	$ 3,693,140	$ 1,259,774
Liabilities	3,417,835	1,167,157
Total Consolidated VIEs
Variable Interest Entity [Line Items]
Assets	3,693,140	1,259,774
Liabilities	$ 3,417,835	$ 1,167,157
Number of VIEs (in investments) | Investment	28	22
Total Consolidated VIEs | Residential loans held-for-investment, at Redwood
Variable Interest Entity [Line Items]
Assets	$ 2,735,153	$ 1,252,879
Total Consolidated VIEs | Multifamily loans, held-for-investment
Variable Interest Entity [Line Items]
Assets	942,165
Total Consolidated VIEs | Restricted cash
Variable Interest Entity [Line Items]
Assets	158	151
Total Consolidated VIEs | Accrued interest receivable
Variable Interest Entity [Line Items]
Assets	12,749	3,391
Total Consolidated VIEs | REO
Variable Interest Entity [Line Items]
Assets	2,915	3,353
Total Consolidated VIEs | Accrued interest payable
Variable Interest Entity [Line Items]
Liabilities	10,839	2,568
Total Consolidated VIEs | Accrued expenses and other liabilities
Variable Interest Entity [Line Items]
Liabilities	11	4
Total Consolidated VIEs | Asset-backed securities issued
Variable Interest Entity [Line Items]
Liabilities	3,406,985	1,164,585
Legacy Sequoia
Variable Interest Entity [Line Items]
Assets	557,880	637,184
Liabilities	$ 545,513	$ 622,982
Number of VIEs (in investments) | Investment	20	20
Legacy Sequoia | Residential loans held-for-investment, at Redwood
Variable Interest Entity [Line Items]
Assets	$ 553,958	$ 632,817
Legacy Sequoia | Multifamily loans, held-for-investment
Variable Interest Entity [Line Items]
Assets	0
Legacy Sequoia | Restricted cash
Variable Interest Entity [Line Items]
Assets	147	147
Legacy Sequoia | Accrued interest receivable
Variable Interest Entity [Line Items]
Assets	860	867
Legacy Sequoia | REO
Variable Interest Entity [Line Items]
Assets	2,915	3,353
Legacy Sequoia | Accrued interest payable
Variable Interest Entity [Line Items]
Liabilities	590	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	544,923	622,445
Sequoia Choice
Variable Interest Entity [Line Items]
Assets	2,190,252	622,590
Liabilities	$ 1,994,110	$ 544,175
Number of VIEs (in investments) | Investment	6	2
Sequoia Choice | Residential loans held-for-investment, at Redwood
Variable Interest Entity [Line Items]
Assets	$ 2,181,195	$ 620,062
Sequoia Choice | Multifamily loans, held-for-investment
Variable Interest Entity [Line Items]
Assets	0
Sequoia Choice | Restricted cash
Variable Interest Entity [Line Items]
Assets	11	4
Sequoia Choice | Accrued interest receivable
Variable Interest Entity [Line Items]
Assets	9,046	2,524
Sequoia Choice | REO
Variable Interest Entity [Line Items]
Assets	0	0
Sequoia Choice | Accrued interest payable
Variable Interest Entity [Line Items]
Liabilities	7,643	2,031
Sequoia Choice | Accrued expenses and other liabilities
Variable Interest Entity [Line Items]
Liabilities	11	4
Sequoia Choice | Asset-backed securities issued
Variable Interest Entity [Line Items]
Liabilities	1,986,456	542,140
Freddie Mac K-Series
Variable Interest Entity [Line Items]
Assets	945,008	0
Liabilities	$ 878,212	$ 0
Number of VIEs (in investments) | Investment	2	0
Freddie Mac K-Series | Residential loans held-for-investment, at Redwood
Variable Interest Entity [Line Items]
Assets	$ 0	$ 0
Freddie Mac K-Series | Multifamily loans, held-for-investment
Variable Interest Entity [Line Items]
Assets	942,165
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	2,843	0
Freddie Mac K-Series | REO
Variable Interest Entity [Line Items]
Assets	0	0
Freddie Mac K-Series | Accrued interest payable
Variable Interest Entity [Line Items]
Liabilities	2,606	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	$ 875,606	$ 0

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