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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		9 Months Ended
	Mar. 14, 2019 USD ($)	Mar. 31, 2017 variable_interest_entity	Sep. 30, 2019 USD ($) securitization	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) securitization	Sep. 30, 2018 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 | $			381,700		$ 381,700		$ 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
Receivables and other assets
Variable Interest Entity [Line Items]
Real estate under development | $			$ 13,900		$ 13,900		22,000
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
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			12		12		9
Non Financings Multi Family CMBS | K-Series
Variable Interest Entity [Line Items]
Number of securitizations, non-financing VIE's | securitization			12		12		8
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

X

- Definition

Number of Consolidated Securitizations

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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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- Definition

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
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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).

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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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