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Use of Special Purpose Entities and Variable Interest Entities - Classification and Carrying Value of Unconsolidated VIEs (Details)
$ in Thousands
Sep. 30, 2017
USD ($)
securitization
Dec. 31, 2016
USD ($)
securitization
Variable Interest Entity [Line Items]    
Unconsolidated VIE, maximum loss exposure $ 203,600 $ 185,300
Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Total assets 203,572 185,301
Variable Interest Entity, Not Primary Beneficiary | Investment securities, available for sale, at fair value    
Variable Interest Entity [Line Items]    
Total assets 46,623 43,897
Variable Interest Entity, Not Primary Beneficiary | Receivables and other assets    
Variable Interest Entity [Line Items]    
Total assets 73 74
Variable Interest Entity, Not Primary Beneficiary | Mezzanine loan and preferred equity investments    
Variable Interest Entity [Line Items]    
Total assets 122,578 100,150
Variable Interest Entity, Not Primary Beneficiary | Investment in unconsolidated entities    
Variable Interest Entity [Line Items]    
Total assets 34,298 41,180
Variable Interest Entity, Not Primary Beneficiary | Multi-family CMBS    
Variable Interest Entity [Line Items]    
Total assets 46,696 43,971
Variable Interest Entity, Not Primary Beneficiary | Multi-family CMBS | Investment securities, available for sale, at fair value    
Variable Interest Entity [Line Items]    
Total assets 46,623 43,897
Variable Interest Entity, Not Primary Beneficiary | Multi-family CMBS | Receivables and other assets    
Variable Interest Entity [Line Items]    
Total assets 73 74
Variable Interest Entity, Not Primary Beneficiary | Multi-family CMBS | Mezzanine loan and preferred equity 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 | Mezzanine loan on multi-family properties    
Variable Interest Entity [Line Items]    
Total assets 6,875 18,881
Variable Interest Entity, Not Primary Beneficiary | Mezzanine loan on multi-family properties | Investment securities, available for sale, at fair value    
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 | Mezzanine loan and preferred equity investments    
Variable Interest Entity [Line Items]    
Total assets 6,875 18,881
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 | Preferred equity investment on multi-family properties    
Variable Interest Entity [Line Items]    
Total assets 125,945 100,197
Variable Interest Entity, Not Primary Beneficiary | Preferred equity investment on multi-family properties | Investment securities, available for sale, at fair value    
Variable Interest Entity [Line Items]    
Total assets 0 0
Variable Interest Entity, Not Primary Beneficiary | Preferred equity investment on multi-family properties | Receivables and other assets    
Variable Interest Entity [Line Items]    
Total assets 0 0
Variable Interest Entity, Not Primary Beneficiary | Preferred equity investment on multi-family properties | Mezzanine loan and preferred equity investments    
Variable Interest Entity [Line Items]    
Total assets 115,703 81,269
Variable Interest Entity, Not Primary Beneficiary | Preferred equity investment on multi-family properties | Investment in unconsolidated entities    
Variable Interest Entity [Line Items]    
Total assets 10,242 18,928
Variable Interest Entity, Not Primary Beneficiary | Equity investment in entities that invest in multi-family properties    
Variable Interest Entity [Line Items]    
Total assets 24,056 22,252
Variable Interest Entity, Not Primary Beneficiary | Equity investment in entities that invest in multi-family properties | Investment securities, available for sale, at fair value    
Variable Interest Entity [Line Items]    
Total assets 0 0
Variable Interest Entity, Not Primary Beneficiary | Equity investment 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 investment in entities that invest in multi-family properties | Mezzanine loan and preferred equity investments    
Variable Interest Entity [Line Items]    
Total assets 0 0
Variable Interest Entity, Not Primary Beneficiary | Equity investment in entities that invest in multi-family properties | Investment in unconsolidated entities    
Variable Interest Entity [Line Items]    
Total assets $ 24,056 $ 22,252
K-Series | Multi-family collateralized mortgage backed securities    
Variable Interest Entity [Line Items]    
Number of securitizations | securitization 2 2