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Consolidated K-Series - Narrative (Details) $ in Thousands	1 Months Ended
	Feb. 28, 2015 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2006 securitization
Variable Interest Entity [Line Items]
Mortgage loans on real estate, unpaid principal balance		$ 10,157,126	$ 7,565,459	$ 7,792,422	$ 9,107,248
Multi-family loans held in securitization trusts
Variable Interest Entity [Line Items]
Mortgage loans on real estate, unpaid principal balance		9,400,000	6,700,000
Multi-family collateralized debt obligations, at fair value
Variable Interest Entity [Line Items]
Mortgage loans on real estate, unpaid principal balance		$ 9,400,000	$ 6,700,000
Weighted average interest rate (as a percent)		3.92%	3.97%
Consolidated K-Series
Variable Interest Entity [Line Items]
K-series net carrying value		$ 468,000	$ 314,900
PO Security
Variable Interest Entity [Line Items]
Proceeds from sale of investments	$ 44,300
Gain on sale of investments	1,500
Multi-Family Collateralized Mortgage Backed Securities
Variable Interest Entity [Line Items]
Deconsolidation of assets	1,100,000
Multi-family collateralized debt obligations, at fair value
Variable Interest Entity [Line Items]
Deconsolidation of assets	$ 1,000,000
K-Series | Consolidated K-Series
Variable Interest Entity [Line Items]
Number of securitizations | securitization						4

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-Publisher FASB
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-Topic 230
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-Section 45
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