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Use of Special Purpose Entities (SPE) and Variable Interest Entities (VIE) - Narrative (Details) $ in Thousands		1 Months Ended	3 Months Ended		6 Months Ended
	Mar. 14, 2019 USD ($)	Mar. 31, 2017 variable_interest_entity	Jun. 30, 2019 USD ($) securitization	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) securitization	Jun. 30, 2018 USD ($)	Mar. 25, 2019 USD ($)	Dec. 31, 2018 USD ($) securitization
Variable Interest Entity [Line Items]
Loss on extinguishment of debt			$ 0	$ 0	$ 2,857	$ 0
Unconsolidated VIE, maximum loss exposure			$ 355,500		$ 355,500			$ 269,800
RBDHC
Variable Interest Entity [Line Items]
Ownership percentage					100.00%
Riverchase Landing and The Clusters
Variable Interest Entity [Line Items]
Number of variable interest entities consolidated | variable_interest_entity		2
Multi-family CMBS Re-securitization
Variable Interest Entity [Line Items]
Principal amount	$ 33,200							$ 33,177
Loss on extinguishment of debt	$ 2,900
Multi-family CMBS Re-securitization | K-Series
Variable Interest Entity [Line Items]
Number of consolidated securitizations | securitization								1
Distressed Residential Mortgage Loan Securitization
Variable Interest Entity [Line Items]
Principal amount							$ 6,500	$ 12,381
Non-Financings, Multi-Family CMBS | K-Series
Variable Interest Entity [Line Items]
Number of securitizations, non-financing VIE's | securitization			11		11			8
VIE, Primary Beneficiary | RBDHC
Variable Interest Entity [Line Items]
Noncontrolling interest, ownership by parent, percentage					50.00%
VIE, Primary Beneficiary | K-Series
Variable Interest Entity [Line Items]
Number of consolidated securitizations | securitization			11		11			9
Residential Mortgage Loans Held In Securitization Trusts Net
Variable Interest Entity [Line Items]
Number of securitizations completed to date | securitization			4		4
Number of securitizations, consolidated, accounted for as permanent financing | securitization			3		3
Receivables and other assets
Variable Interest Entity [Line Items]
Real estate under development			$ 16,700		$ 16,700			$ 22,000

X

- Definition

Number of Consolidated Securitizations

+ References

No definition available.

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- Definition

Number of Securitizations Completed to Date

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- Definition

Number of Securitizations Considered Non-Financing Variable Interest Entities

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- Definition

Number of Securitizations, Consolidated, Accounted for as Permanent Financing

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Number of Variable Interest Entities Consolidated

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- Definition

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No definition available.

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- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=117329964&loc=d3e12355-112629

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-Section 45
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- Definition

Cost of real estate projects incurred for projects for eventual sale or transfer (condominium or time share projects, vacation clubs).

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- Definition

This is the principal amount outstanding for securitized loans only (across all types of loans).

+ References

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Percentage of subsidiary's or equity method investee's stock owned by parent immediately after all stock transactions.

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

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-Publisher FASB
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-Section 50
-Paragraph 5A
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