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Fair Value of Financial Instruments - Narrative (Details) - Discount Rate	Mar. 31, 2019	Dec. 31, 2018
CMBS | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Rate used to determine fair value		0.045
CMBS | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Rate used to determine fair value		0.095
Distressed and other residential mortgage loans | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Rate used to determine fair value	0.047
Distressed and other residential mortgage loans | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Rate used to determine fair value	0.120

X

- Definition

Value of input used to measure investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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X

- 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

No definition available.

+ Details

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