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Multi-family Loans - Geographic Concentration Risk (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Tennessee | Multi-family loans
Concentration Risk [Line Items]
Geographic concentrations	14.30%	12.30%
FLORIDA | VIE, Primary Beneficiary | Consolidated K-Series | Geographic Concentration Risk | Consolidated K-Series
Concentration Risk [Line Items]
Geographic concentrations		6.20%
FLORIDA | Multi-family loans
Concentration Risk [Line Items]
Geographic concentrations	11.40%	10.60%
Georgia | Multi-family loans
Concentration Risk [Line Items]
Geographic concentrations	10.10%	11.80%
TEXAS | VIE, Primary Beneficiary | Consolidated K-Series | Geographic Concentration Risk | Consolidated K-Series
Concentration Risk [Line Items]
Geographic concentrations		12.40%
TEXAS | Multi-family loans
Concentration Risk [Line Items]
Geographic concentrations	9.70%	10.00%
Florida | Multi-family loans
Concentration Risk [Line Items]
Geographic concentrations	8.50%	12.00%
New Jersey | Multi-family loans
Concentration Risk [Line Items]
Geographic concentrations	7.20%	6.30%
NEW JERSEY
Concentration Risk [Line Items]
Geographic concentrations	5.70%	4.90%
NEW JERSEY | Multi-family loans
Concentration Risk [Line Items]
Geographic concentrations	5.80%	5.00%
Ohio
Concentration Risk [Line Items]
Geographic concentrations	5.20%	0.00%
South Carolina
Concentration Risk [Line Items]
Geographic concentrations	5.00%	8.40%
CALIFORNIA | VIE, Primary Beneficiary | Consolidated K-Series | Geographic Concentration Risk | Consolidated K-Series
Concentration Risk [Line Items]
Geographic concentrations		15.90%
Maryland | VIE, Primary Beneficiary | Consolidated K-Series | Geographic Concentration Risk | Consolidated K-Series
Concentration Risk [Line Items]
Geographic concentrations		5.80%

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