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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 ($) securitization	Sep. 30, 2019 USD ($) securitization	Sep. 30, 2018 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		$ 103,724	$ 65,906	$ 57,471
Multi-family loans held in securitization trusts, at fair value		11,679,847	15,863,264
Real estate held for sale in consolidated variable interest entities		29,704	0
Receivables and other assets		114,821	205,642
Total Assets	[1]	14,737,638	19,759,249
Securitized debt		42,335	0
Mortgages and notes payable in consolidated variable interest entities		31,227	935
Accrued expenses and other liabilities		101,228	153,722
Total Liabilities	[1]	13,557,345	17,912,250
Class A Notes | Collateralized Mortgage Obligations
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	42,119
Multi-family collateralized debt obligations, at fair value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Collateralized debt obligations		11,022,248	14,978,199
Residential Mortgage Loan Securitization
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		0	0
Receivables and other assets		1,061	1,274
Total Assets		57,856	46,946
Accrued expenses and other liabilities		26	35
Total Liabilities		53,066	42,154
Residential Mortgage Loan Securitization | Residential collateralized debt obligations
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Collateralized debt obligations		53,040	42,119
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	45,672
Consolidated K-Series
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		0	0
Receivables and other assets		37,679	51,950
Total Assets		10,610,455	15,915,214
Accrued expenses and other liabilities		37,022	50,783
Total Liabilities		10,022,666	15,028,982
Consolidated K-Series | Residential collateralized debt obligations
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Collateralized debt obligations			0
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	14,978,199
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	15,863,264
Other
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		708	656
Real estate held for sale in consolidated variable interest entities		29,704
Receivables and other assets		23,254	14,098
Total Assets		53,666	14,754
Mortgages and notes payable in consolidated variable interest entities		31,227	935
Accrued expenses and other liabilities		1,166	120
Total Liabilities		32,393	1,055
Other | Residential collateralized debt obligations
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Collateralized debt obligations			0
Financing And Other VIEs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		708	656
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	67,322
Total Assets		11,984,374	15,976,914
Securitized debt		42,335
Mortgages and notes payable in consolidated variable interest entities		31,227	935
Accrued expenses and other liabilities		42,886	50,938
Total Liabilities		11,191,736	15,072,191
Financing And Other VIEs | Residential collateralized debt obligations
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Collateralized debt obligations		53,040	42,119
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	14,978,199
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	45,672
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	$ 15,863,264
Multi-family CMBS Re-securitization
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		0
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]
Cash and cash equivalents		0
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
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	12
[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 September 30, 2019 and December 31, 2018, assets of consolidated VIEs totaled $15,976,914 and $11,984,374, respectively, and the liabilities of consolidated VIEs totaled $15,072,191 and $11,191,736, respectively. See Note 9 for further discussion.

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