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Consolidated K-Series - Narrative (Details) $ in Millions	Sep. 30, 2017 USD ($) securitization	Dec. 31, 2016 USD ($) securitization	Dec. 31, 2015 securitization	Dec. 31, 2006 securitization
Multi-family collateralized debt obligations, at fair value
Mortgage Loans on Real Estate [Line Items]
Loans, unpaid principal balance	$ 8,100.0	$ 6,700.0
Weighted average interest rate	4.07%	3.97%
Multi-family loans held in securitization trusts
Mortgage Loans on Real Estate [Line Items]
Loans, unpaid principal balance	$ 8,100.0	$ 6,700.0
Consolidated K-Series
Mortgage Loans on Real Estate [Line Items]
K-Series, carrying value	$ 408.7	$ 314.9
Consolidated K-Series | K-Series
Mortgage Loans on Real Estate [Line Items]
Number of securitizations | securitization	6	5	4	4

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- Definition

Represents the aggregate carrying value of the investment in the multi-family loans held in securitization trusts.

+ References

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- Definition

Number of Securitizations

+ References

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- Definition

Weighted average interest rate of debt outstanding.

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- Definition

Total carrying amount of mortgage loans as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 6
-Subparagraph (SX 210.5-04.(c) Schedule IV)
-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29.6)
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

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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.

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