XML 76 R63.htm IDEA: XBRL DOCUMENT v3.10.0.1
RESIDENTIAL MORTGAGE LOAN SECURITIZATION TRUSTS - Geographic Concentrations (Details) - Geographic Concentration Risk - Residential mortgage loans
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
California    
Variable Interest Entity [Line Items]    
Concentration risk, percentage 38.10% 37.00%
Washington    
Variable Interest Entity [Line Items]    
Concentration risk, percentage 13.80% 15.30%
Massachusetts    
Variable Interest Entity [Line Items]    
Concentration risk, percentage 8.50% 8.10%
Florida    
Variable Interest Entity [Line Items]    
Concentration risk, percentage 6.60% 6.40%