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Use of Special Purpose Entities and Variable Interest Entities - Classification and Carrying Value of Unconsolidated VIEs (Details)
$ in Thousands
Jun. 30, 2018
USD ($)
securitization
Dec. 31, 2017
USD ($)
securitization
Variable Interest Entity [Line Items]    
Unconsolidated VIE, maximum loss exposure $ 262,800 $ 220,800
Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Total assets 262,768 220,797
Variable Interest Entity, Not Primary Beneficiary | Investment securities, available for sale, at fair value, held in securitization trusts    
Variable Interest Entity [Line Items]    
Total assets 50,134 47,922
Variable Interest Entity, Not Primary Beneficiary | Receivables and other assets    
Variable Interest Entity [Line Items]    
Total assets 72 73
Variable Interest Entity, Not Primary Beneficiary | Preferred equity and mezzanine loan investments    
Variable Interest Entity [Line Items]    
Total assets 176,741 138,920
Variable Interest Entity, Not Primary Beneficiary | Investment in unconsolidated entities    
Variable Interest Entity [Line Items]    
Total assets 35,821 33,882
Variable Interest Entity, Not Primary Beneficiary | Multi-family CMBS    
Variable Interest Entity [Line Items]    
Total assets 50,206 47,995
Variable Interest Entity, Not Primary Beneficiary | Multi-family CMBS | Investment securities, available for sale, at fair value, held in securitization trusts    
Variable Interest Entity [Line Items]    
Total assets 50,134 47,922
Variable Interest Entity, Not Primary Beneficiary | Multi-family CMBS | Receivables and other assets    
Variable Interest Entity [Line Items]    
Total assets 72 73
Variable Interest Entity, Not Primary Beneficiary | Multi-family CMBS | Preferred equity and mezzanine loan investments    
Variable Interest Entity [Line Items]    
Total assets 0 0
Variable Interest Entity, Not Primary Beneficiary | Multi-family CMBS | Investment in unconsolidated entities    
Variable Interest Entity [Line Items]    
Total assets 0 0
Variable Interest Entity, Not Primary Beneficiary | Preferred equity investments in multi-family properties    
Variable Interest Entity [Line Items]    
Total assets 178,629 140,329
Variable Interest Entity, Not Primary Beneficiary | Preferred equity investments in multi-family properties | Investment securities, available for sale, at fair value, held in securitization trusts    
Variable Interest Entity [Line Items]    
Total assets 0 0
Variable Interest Entity, Not Primary Beneficiary | Preferred equity investments in multi-family properties | Receivables and other assets    
Variable Interest Entity [Line Items]    
Total assets 0 0
Variable Interest Entity, Not Primary Beneficiary | Preferred equity investments in multi-family properties | Preferred equity and mezzanine loan investments    
Variable Interest Entity [Line Items]    
Total assets 170,110 132,009
Variable Interest Entity, Not Primary Beneficiary | Preferred equity investments in multi-family properties | Investment in unconsolidated entities    
Variable Interest Entity [Line Items]    
Total assets 8,519 8,320
Variable Interest Entity, Not Primary Beneficiary | Mezzanine loan on multi-family properties    
Variable Interest Entity [Line Items]    
Total assets 6,631 6,911
Variable Interest Entity, Not Primary Beneficiary | Mezzanine loan on multi-family properties | Investment securities, available for sale, at fair value, held in securitization trusts    
Variable Interest Entity [Line Items]    
Total assets 0 0
Variable Interest Entity, Not Primary Beneficiary | Mezzanine loan on multi-family properties | Receivables and other assets    
Variable Interest Entity [Line Items]    
Total assets 0 0
Variable Interest Entity, Not Primary Beneficiary | Mezzanine loan on multi-family properties | Preferred equity and mezzanine loan investments    
Variable Interest Entity [Line Items]    
Total assets 6,631 6,911
Variable Interest Entity, Not Primary Beneficiary | Mezzanine loan on multi-family properties | Investment in unconsolidated entities    
Variable Interest Entity [Line Items]    
Total assets 0 0
Variable Interest Entity, Not Primary Beneficiary | Equity investments in entities that invest in multi-family properties    
Variable Interest Entity [Line Items]    
Total assets 27,302 25,562
Variable Interest Entity, Not Primary Beneficiary | Equity investments in entities that invest in multi-family properties | Investment securities, available for sale, at fair value, held in securitization trusts    
Variable Interest Entity [Line Items]    
Total assets 0 0
Variable Interest Entity, Not Primary Beneficiary | Equity investments in entities that invest in multi-family properties | Receivables and other assets    
Variable Interest Entity [Line Items]    
Total assets 0 0
Variable Interest Entity, Not Primary Beneficiary | Equity investments in entities that invest in multi-family properties | Preferred equity and mezzanine loan investments    
Variable Interest Entity [Line Items]    
Total assets 0 0
Variable Interest Entity, Not Primary Beneficiary | Equity investments in entities that invest in multi-family properties | Investment in unconsolidated entities    
Variable Interest Entity [Line Items]    
Total assets $ 27,302 $ 25,562
K-Series | Multi-family collateralized mortgage backed securities    
Variable Interest Entity [Line Items]    
Number of securitizations | securitization 2 2