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Multifamily Loans (Details) $ in Thousands			3 Months Ended	12 Months Ended
	Mar. 31, 2020 USD ($) loan	Dec. 31, 2019 USD ($) loan	Mar. 31, 2020 USD ($) loan	Dec. 31, 2018 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Multifamily loans deconsolidated			$ 3,850,000
Multifamily loans, held-for-investment, at fair value
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of loans | loan	28	279
Loan principal	$ 465,000	$ 4,200,000	465,000
Loans, at fair value	$ 470,000	$ 4,410,000	$ 470,000
Weighted average original loan-to-value (LTV)	67.00%		67.00%
Weighted average coupon rate	4.25%		4.25%
Contract maturities			5 years
Number of loans past due | loan	0	0	0
Number of loans in foreclosure | loan	0	0	0
Net market valuation gain (loss)			$ (82,000)	$ 34,000
Multifamily loans, held-for-investment, at fair value | Minimum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Weighted average maturity (in years)			7 years
Multifamily loans, held-for-investment, at fair value | Maximum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Weighted average maturity (in years)			10 years
Redwood
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans, at fair value	$ 415,333	$ 569,185	$ 415,333
Held-for-investment at fair value | Redwood
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of loans | loan	0	2,940
Loan principal		$ 2,050,000
Loans, at fair value	$ 0	$ 2,110,000	$ 0
Number of loans in foreclosure | loan		0
Held-for-investment at fair value | Redwood | Financing Receivables, Equal to Greater than 90 Days Past Due
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loan principal		$ 1,000
Number of loans past due | loan		2

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Number of mortgage loans within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Footnote 3
-Subsection 29

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522

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-Topic 942
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Topic 948
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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
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