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Consolidated K-Series and Consolidated SLST - Geographic Concentrations of Credit Risk (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Texas
Concentration Risk [Line Items]
Geographic concentrations	10.60%	16.60%
Florida
Concentration Risk [Line Items]
Geographic concentrations	12.00%	11.30%
New Jersey
Concentration Risk [Line Items]
Geographic concentrations	5.00%	2.60%
Consolidated K-Series | Geographic Concentration Risk | Multi-family loans held in securitization trusts | California
Concentration Risk [Line Items]
Geographic concentrations	15.90%	14.80%
Consolidated K-Series | Geographic Concentration Risk | Multi-family loans held in securitization trusts | Texas
Concentration Risk [Line Items]
Geographic concentrations	12.40%	13.00%
Consolidated K-Series | Geographic Concentration Risk | Multi-family loans held in securitization trusts | Florida
Concentration Risk [Line Items]
Geographic concentrations	6.20%	4.50%
Consolidated K-Series | Geographic Concentration Risk | Multi-family loans held in securitization trusts | Maryland
Concentration Risk [Line Items]
Geographic concentrations	5.80%	5.00%
Consolidated SLST | Geographic Concentration Risk | Multi-family loans held in securitization trusts | California
Concentration Risk [Line Items]
Geographic concentrations	11.00%
Consolidated SLST | Geographic Concentration Risk | Multi-family loans held in securitization trusts | Florida
Concentration Risk [Line Items]
Geographic concentrations	10.60%
Consolidated SLST | Geographic Concentration Risk | Multi-family loans held in securitization trusts | New York
Concentration Risk [Line Items]
Geographic concentrations	9.10%
Consolidated SLST | Geographic Concentration Risk | Multi-family loans held in securitization trusts | New Jersey
Concentration Risk [Line Items]
Geographic concentrations	6.90%
Consolidated SLST | Geographic Concentration Risk | Multi-family loans held in securitization trusts | Illinois
Concentration Risk [Line Items]
Geographic concentrations	6.60%

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