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Subseqent Events (Details) - USD ($)	Jan. 11, 2019	Nov. 13, 2018	Aug. 14, 2018	Feb. 15, 2019	Feb. 14, 2019	Dec. 31, 2018	Dec. 31, 2017
Subsequent Event [Line Items]
Fair Value						$ 1,512,252,000	$ 1,413,081,000
CMBS
Subsequent Event [Line Items]
Fair Value						260,485,000	141,420,000
Available-for-sale Securities
Subsequent Event [Line Items]
Securities held-in-trust						52,700,000	47,922,000
Available-for-sale Securities | CMBS
Subsequent Event [Line Items]
Securities held-in-trust						52,700,000	47,900,000
Multi-family CMBS
Subsequent Event [Line Items]
Fair Value						123,200,000
Multi-family CMBS Re-securitization
Subsequent Event [Line Items]
Outstanding balance						33,177,000	33,350,000
Multi-family CMBS Re-securitization | Multi-family CMBS
Subsequent Event [Line Items]
Outstanding balance						33,200,000
Consolidated K-Series
Subsequent Event [Line Items]
K-series net carrying value						657,600,000	468,000,000
Consolidated K-Series | Mulit Family CMBS
Subsequent Event [Line Items]
K-series net carrying value						70,500,000
Residential Mortgage Loans | Deutsche Bank AG, Cayman Islands Branch
Subsequent Event [Line Items]
Repurchase agreement, principal						$ 50,000,000.0	25,000,000.0
Repurchase agreement uncommitted amount (in excess of)							$ 25,000,000.0
Underwritten Public Offering
Subsequent Event [Line Items]
Stock issued (in shares)		14,375,000	14,375,000
Share price (in dollars per share)		$ 6.11	$ 6.16
Net proceeds		$ 85,300,000	$ 86,000,000
Subsequent Event | Residential Mortgage Loans | Deutsche Bank AG, Cayman Islands Branch
Subsequent Event [Line Items]
Repurchase agreement, principal				$ 200,000,000.0	$ 200,000,000.0
Subsequent Event | Underwritten Public Offering
Subsequent Event [Line Items]
Stock issued (in shares)	14,490,000
Share price (in dollars per share)	$ 5.96
Net proceeds	$ 83,800,000

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- Definition

The total amount of repossession that is available under the repurchase agreement.

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