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Residential Collateralized Debt Obligations (Details)
$ in Millions
Jun. 30, 2018
USD ($)
securitization
Dec. 31, 2017
USD ($)
securitization
Debt Instrument [Line Items]    
Number of residential CDO securitizations | securitization 3 3
CDOs outstanding $ 4.9 $ 4.4
Arm Loans    
Debt Instrument [Line Items]    
Loans pledged as collateral 69.5 77.5
Residential collateralized debt obligations    
Debt Instrument [Line Items]    
Secured debt, carrying value $ 62.2 $ 70.3
Weighted average interest rate 2.70% 2.16%