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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
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
securitization
Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Total assets $ 355,514 $ 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 24,739 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 191,387 165,555
Variable Interest Entity, Not Primary Beneficiary | Investments in unconsolidated entities    
Variable Interest Entity [Line Items]    
Total assets 139,388 51,426
Variable Interest Entity, Not Primary Beneficiary | ABS    
Variable Interest Entity [Line Items]    
Total assets 24,739  
Variable Interest Entity, Not Primary Beneficiary | ABS | Investment securities, available for sale, at fair value, held in securitization trusts    
Variable Interest Entity [Line Items]    
Total assets 24,739  
Variable Interest Entity, Not Primary Beneficiary | ABS | Preferred equity and mezzanine loan investments    
Variable Interest Entity [Line Items]    
Total assets 0  
Variable Interest Entity, Not Primary Beneficiary | ABS | Investments in unconsolidated entities    
Variable Interest Entity [Line Items]    
Total assets 0  
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 262,767 195,101
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 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 184,727 154,629
Variable Interest Entity, Not Primary Beneficiary | Preferred equity investments in multi-family properties | Investments in unconsolidated entities    
Variable Interest Entity [Line Items]    
Total assets 78,040 40,472
Variable Interest Entity, Not Primary Beneficiary | Mezzanine loans on multi-family properties    
Variable Interest Entity [Line Items]    
Total assets 6,660 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 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 6,660 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 61,348 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 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 $ 61,348 $ 10,954
K-Series | Multi-family collateralized mortgage backed securities    
Variable Interest Entity [Line Items]    
Number of securitizations | securitization   2