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Financing Arrangements, Distressed and Other Residential Mortgage Loans - Narrative (Details) - USD ($)	Feb. 15, 2019	Feb. 14, 2019	Dec. 31, 2018	Nov. 30, 2018	Dec. 31, 2017
Pool of Distressed Residential Mortgage Loans | Deutsche Bank AG, Cayman Islands Branch
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Repurchase agreement, principal			$ 100,000,000
Repurchase agreement, outstanding balance			120,700,000		$ 123,600,000
Repurchase agreement uncommitted amount (in excess of)			$ 150,000,000
Repurchase agreement, interest rate (as a percent)			4.91%		4.05%
Residential Mortgage Loans | Deutsche Bank AG, Cayman Islands Branch
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Repurchase agreement, principal			$ 50,000,000.0		$ 25,000,000.0
Repurchase agreement, outstanding balance			$ 33,900,000		26,100,000
Repurchase agreement uncommitted amount (in excess of)					$ 25,000,000.0
Repurchase agreement, interest rate (as a percent)			6.01%		5.05%
Residential Mortgage Loans | Credit Suisse AG, Cayman Islands
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Repurchase agreement, principal				$ 750,000,000.00
Repurchase agreement, outstanding balance			$ 434,600,000
Repurchase agreement, interest rate (as a percent)			4.50%
Subsequent Event | Residential Mortgage Loans | Deutsche Bank AG, Cayman Islands Branch
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Repurchase agreement, principal	$ 200,000,000.0	$ 200,000,000.0

X

- Definition

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

+ References

No definition available.

+ Details

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- Definition

Assets Sold Under Agreements to Repurchase, Maximum Uncommitted Repurchase Amount

+ References

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- Definition

Interest rate on the amount to be repaid to the counterparty to the repurchase agreement when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under the repurchase agreement exceeds 10 percent of total assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(m)(1)(i)(A)(ii))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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- Definition

Amount to be repaid to the counterparty to the repurchase agreement when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under the repurchase agreement exceeds 10 percent of total assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(m)(1)(i)(A)(ii))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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