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Use of Special Purpose Entities and Variable Interest Entities - Assets and Liabilities of Consolidated VIEs (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
securitization
Dec. 31, 2017
USD ($)
securitization
Mar. 31, 2017
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents $ 65,495 $ 95,191 $ 73,033
Multi-family loans held in securitization trusts, at fair value 9,438,309 9,657,421  
Real estate held for sale in consolidated variable interest entities 29,293 64,202  
Receivables and other assets 99,032 117,822  
Total Assets [1] 11,765,879 12,056,285  
Securitized debt 70,215 81,537  
Mortgages and notes payable in consolidated variable interest entities 32,072 57,124  
Accrued expenses and other liabilities 81,579 82,126  
Total Liabilities [1] 10,815,092 11,080,284  
Collateralized Mortgage Obligations | Class A Notes      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Proceeds from issuance of secured debt $ 177,500 $ 177,500  
Available-for-sale securities, debt securities, ownership percentage 5.00% 5.00%  
Residential collateralized debt obligations      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Collateralized debt obligations $ 67,154 $ 70,308  
Multi-family collateralized debt obligations, at fair value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Collateralized debt obligations 8,953,467 9,189,459  
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 70,864 73,820  
Multi-family CMBS Re-securitization      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investment securities available for sale 48,857 47,922  
Receivables and other assets 4,310 4,333  
Total Assets 1,186,306 1,209,981  
Securitized debt 29,390 29,164  
Accrued expenses and other liabilities 4,294 4,316  
Total Liabilities 1,101,823 1,127,524  
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 1,068,139 1,094,044  
Multi-family CMBS Re-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   0  
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 1,133,139 1,157,726  
Distressed Residential Mortgage Loan Securitizations      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Receivables and other assets 6,587 15,428  
Total Assets 125,788 137,219  
Securitized debt 40,825 52,373  
Accrued expenses and other liabilities 782 2,957  
Total Liabilities 41,607 55,330  
Distressed Residential Mortgage Loan Securitizations | 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   0  
Distressed Residential Mortgage Loan Securitizations | 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 119,201 121,791  
Residential Mortgage Loan Securitization      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Receivables and other assets 935 935  
Total Assets 71,799 74,755  
Accrued expenses and other liabilities 26 24  
Total Liabilities 67,180 70,332  
Residential Mortgage Loan Securitization | Residential collateralized debt obligations      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Collateralized debt obligations 67,154 70,308  
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 70,864 73,820  
Multi-family CMBS      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Receivables and other assets 29,199 29,301  
Total Assets 8,334,369 8,528,996  
Accrued expenses and other liabilities 28,867 28,969  
Total Liabilities 7,914,195 8,124,384  
Multi-family CMBS | Multi-family collateralized debt obligations, at fair value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Collateralized debt obligations 7,885,328 8,095,415  
Multi-family CMBS | 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   0  
Multi-family CMBS | 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 8,305,170 8,499,695  
Other      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents 682 808  
Real estate held for sale in consolidated variable interest entities 29,293 64,202  
Receivables and other assets 22,968 25,507  
Total Assets 52,943 90,517  
Mortgages and notes payable in consolidated variable interest entities 32,072 57,124  
Accrued expenses and other liabilities 763 1,727  
Total Liabilities 32,835 58,851  
Financing And Other VIEs      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents 682 808  
Investment securities available for sale 48,857 47,922  
Real estate held for sale in consolidated variable interest entities 29,293 64,202  
Receivables and other assets 63,999 75,504  
Total Assets 9,771,205 10,041,468  
Securitized debt 70,215 81,537  
Mortgages and notes payable in consolidated variable interest entities 32,072 57,124  
Accrued expenses and other liabilities 34,732 37,993  
Total Liabilities 9,157,640 9,436,421  
Financing And Other VIEs | Residential collateralized debt obligations      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Collateralized debt obligations 67,154 70,308  
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 8,953,467 9,189,459  
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 70,864 73,820  
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 119,201 121,791  
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 $ 9,438,309 $ 9,657,421  
Multi-family collateralized mortgage backed securities | K-Series      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Number of securitizations | securitization 2 2  
Number of consolidated securitizations | securitization 1 1  
Non-Financings, Multi-Family CMBS | K-Series      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Number of securitizations, non-financing VIE's | securitization 6 6  
[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 March 31, 2018 and December 31, 2017, assets of consolidated VIEs totaled $9,771,205 and $10,041,468, respectively, and the liabilities of consolidated VIEs totaled $9,157,640 and $9,436,421, respectively. See Note 10 for further discussion.