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Fair Value of Financial Instruments - Narrative (Details) - Discount Rate - CMBS	Jun. 30, 2018
Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value measurement input	0.045
Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value measurement input	0.100

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

+ Details

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Balance Type:	na
Period Type:	instant

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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Balance Type:	na
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- Details

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- Details

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- Details

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