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Use of Special Purpose Entities and Variable Interest Entities - Narrative (Details) $ in Millions		3 Months Ended
	Mar. 31, 2017 USD ($) variable_interest_entity	Mar. 31, 2018 securitization	Dec. 31, 2017 securitization
Riverchase Landing and The Clusters
Variable Interest Entity [Line Items]
Number of variable interest entities consolidated | variable_interest_entity	2
Riverchase Landing and The Clusters
Variable Interest Entity [Line Items]
Consideration transferred | $	$ 12.5
Non-Financings, Multi-Family CMBS | K-Series
Variable Interest Entity [Line Items]
Number of securitizations not considered non-financing VIE's		7	7
Number of securitizations, non-financing VIE's		6	6
VIE, Primary Beneficiary | RBDHC
Variable Interest Entity [Line Items]
Noncontrolling interest, ownership by parent, percentage		50.00%

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Number Of Securitizations Not Considered Non-Financing Variable Interest Entities

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Number of Securitizations Considered Non-Financing Variable Interest Entities

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- Definition

Number of Variable Interest Entities Consolidated

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477

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- Definition

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=77990344&loc=SL6759159-111685

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