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Use of Special Purpose Entities (SPE) and Variable Interest Entities (VIE) - Assets and Liabilities of Consolidated VIEs (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2018 USD ($) securitization	Jun. 30, 2019 USD ($) securitization	Jun. 30, 2018 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		$ 103,724	$ 134,993	$ 84,717
Multi-family loans held in securitization trusts, at fair value		11,679,847	14,573,925
Real estate held for sale in consolidated variable interest entities		29,704	0
Receivables and other assets		114,821	135,845
Total Assets	[1]	14,737,638	18,265,484
Securitized debt		42,335	0
Mortgages and notes payable in consolidated variable interest entities		31,227	3,986
Accrued expenses and other liabilities		101,228	134,615
Total Liabilities	[1]	13,557,345	16,737,802
Collateralized Mortgage Obligations | Class A Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Proceeds from issuance of secured debt		$ 177,500
Percentage of ownership		5.00%
Residential collateralized debt obligations
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Collateralized debt obligations		$ 53,040	45,280
Multi-family collateralized debt obligations, at fair value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Collateralized debt obligations		11,022,248	13,772,726
Residential Mortgage Loan Securitization
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Receivables and other assets		1,061	1,302
Total Assets		57,856	50,101
Accrued expenses and other liabilities		26	40
Total Liabilities		53,066	45,320
Residential Mortgage Loan Securitization | Residential collateralized debt obligations
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Collateralized debt obligations		53,040	45,280
Residential Mortgage Loan Securitization | Residential mortgage loans held in securitization trusts, net
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Residential mortgage loans held in securitization trusts, net		56,795	48,799
Consolidated K-Series
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Receivables and other assets		37,679	48,958
Total Assets		10,610,455	14,622,883
Accrued expenses and other liabilities		37,022	47,921
Total Liabilities		10,022,666	13,820,647
Consolidated K-Series | Multi-family collateralized debt obligations, at fair value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Collateralized debt obligations		9,985,644	13,772,726
Consolidated K-Series | Multi-family loans held in securitization trusts, at fair value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Multi-family loans held in securitization trusts, at fair value		10,572,776	14,573,925
Other
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		708	1,513
Real estate held for sale in consolidated variable interest entities		29,704
Receivables and other assets		23,254	16,984
Total Assets		53,666	18,497
Mortgages and notes payable in consolidated variable interest entities		31,227	3,986
Accrued expenses and other liabilities		1,166	111
Total Liabilities		32,393	4,097
Multi-family CMBS Re-securitization
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale		52,700
Receivables and other assets		4,243
Total Assets		1,164,014
Securitized debt		30,121
Accrued expenses and other liabilities		4,228
Total Liabilities		$ 1,070,953
Multi-family CMBS Re-securitization | Consolidated K-Series
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of securitizations | securitization		2
Number of consolidated securitizations | securitization		1
Multi-family CMBS Re-securitization | Multi-family collateralized debt obligations, at fair value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Collateralized debt obligations		$ 1,036,604
Multi-family CMBS Re-securitization | Multi-family loans held in securitization trusts, at fair value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Multi-family loans held in securitization trusts, at fair value		1,107,071
Distressed Residential Mortgage Loan Securitization
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Receivables and other assets		10,287
Total Assets		98,383
Securitized debt		12,214
Accrued expenses and other liabilities		444
Total Liabilities		12,658
Distressed Residential Mortgage Loan Securitization | Distressed residential mortgage loans held in securitization trusts, net
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Residential mortgage loans held in securitization trusts, net		88,096
Financing And Other VIEs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		708	1,513
Investment securities available for sale		52,700
Real estate held for sale in consolidated variable interest entities		29,704
Receivables and other assets		76,524	67,244
Total Assets		11,984,374	14,691,481
Securitized debt		42,335
Mortgages and notes payable in consolidated variable interest entities		31,227	3,986
Accrued expenses and other liabilities		42,886	48,072
Total Liabilities		11,191,736	13,870,064
Financing And Other VIEs | Residential collateralized debt obligations
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Collateralized debt obligations		53,040	45,280
Financing And Other VIEs | Multi-family collateralized debt obligations, at fair value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Collateralized debt obligations		11,022,248	13,772,726
Financing And Other VIEs | Residential mortgage loans held in securitization trusts, net
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Residential mortgage loans held in securitization trusts, net		56,795	48,799
Financing And Other VIEs | Distressed residential mortgage loans held in securitization trusts, net
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Residential mortgage loans held in securitization trusts, net		88,096
Financing And Other VIEs | Multi-family loans held in securitization trusts, at fair value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Multi-family loans held in securitization trusts, at fair value		$ 11,679,847	$ 14,573,925
Non-Financings, Multi-Family CMBS | Consolidated K-Series
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of securitizations, non-financing VIE's | securitization		8	11
[1] Our condensed consolidated balance sheets include assets and liabilities of consolidated variable interest entities ("VIEs") as the Company is the primary beneficiary of these VIEs. As of June 30, 2019 and December 31, 2018, assets of consolidated VIEs totaled $14,691,481 and $11,984,374, respectively, and the liabilities of consolidated VIEs totaled $13,870,064 and $11,191,736, respectively. See Note 9 for further discussion.

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