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Use of Special Purpose Entities (SPE) and Variable Interest Entities (VIE) - Classification and Carrying Value of Unconsolidated VIEs (Details)
$ in Thousands
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
securitization
Variable Interest Entity [Line Items]    
Unconsolidated VIE, maximum loss exposure $ 242,100 $ 269,800
Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Total assets 242,102 269,753
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   52,700
Variable Interest Entity, Not Primary Beneficiary | Receivables and other assets    
Variable Interest Entity [Line Items]    
Total assets   72
Variable Interest Entity, Not Primary Beneficiary | Preferred equity and mezzanine loan investments    
Variable Interest Entity [Line Items]    
Total assets 175,128 165,555
Variable Interest Entity, Not Primary Beneficiary | Investments in unconsolidated entities    
Variable Interest Entity [Line Items]    
Total assets 66,974 51,426
Variable Interest Entity, Not Primary Beneficiary | Multi-family CMBS    
Variable Interest Entity [Line Items]    
Total assets   52,772
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   52,700
Variable Interest Entity, Not Primary Beneficiary | Multi-family CMBS | Receivables and other assets    
Variable Interest Entity [Line Items]    
Total assets   72
Variable Interest Entity, Not Primary Beneficiary | Multi-family CMBS | Preferred equity and mezzanine loan investments    
Variable Interest Entity [Line Items]    
Total assets   0
Variable Interest Entity, Not Primary Beneficiary | Multi-family CMBS | Investments in unconsolidated entities    
Variable Interest Entity [Line Items]    
Total assets   0
Variable Interest Entity, Not Primary Beneficiary | Preferred equity investments in multi-family properties    
Variable Interest Entity [Line Items]    
Total assets 220,322 195,101
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
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
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 164,533 154,629
Variable Interest Entity, Not Primary Beneficiary | Preferred equity investments in multi-family properties | Investments in unconsolidated entities    
Variable Interest Entity [Line Items]    
Total assets 55,789 40,472
Variable Interest Entity, Not Primary Beneficiary | Mezzanine loans on multi-family properties    
Variable Interest Entity [Line Items]    
Total assets 10,595 10,926
Variable Interest Entity, Not Primary Beneficiary | Mezzanine loans on multi-family properties | Investment securities, available for sale, at fair value, held in securitization trusts    
Variable Interest Entity [Line Items]    
Total assets   0
Variable Interest Entity, Not Primary Beneficiary | Mezzanine loans on multi-family properties | Receivables and other assets    
Variable Interest Entity [Line Items]    
Total assets   0
Variable Interest Entity, Not Primary Beneficiary | Mezzanine loans on multi-family properties | Preferred equity and mezzanine loan investments    
Variable Interest Entity [Line Items]    
Total assets 10,595 10,926
Variable Interest Entity, Not Primary Beneficiary | Mezzanine loans on multi-family properties | Investments 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 residential properties    
Variable Interest Entity [Line Items]    
Total assets 11,185 10,954
Variable Interest Entity, Not Primary Beneficiary | Equity investments in entities that invest in residential properties | Investment securities, available for sale, at fair value, held in securitization trusts    
Variable Interest Entity [Line Items]    
Total assets   0
Variable Interest Entity, Not Primary Beneficiary | Equity investments in entities that invest in residential properties | Receivables and other assets    
Variable Interest Entity [Line Items]    
Total assets   0
Variable Interest Entity, Not Primary Beneficiary | Equity investments in entities that invest in residential 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 residential properties | Investments in unconsolidated entities    
Variable Interest Entity [Line Items]    
Total assets $ 11,185 $ 10,954
K-Series | Multi-family collateralized mortgage backed securities    
Variable Interest Entity [Line Items]    
Number of securitizations | securitization   2