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Residential Collateralized Debt Obligations - Narrative (Details)
$ in Millions
Dec. 31, 2018
USD ($)
securitization
Dec. 31, 2017
USD ($)
securitization
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Number of residential CDO securitizations | securitization 3 3
Net investment in residential securitization trusts $ 4.8 $ 4.4
ARM Loans    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Loans pledged as collateral 60.2 77.5
Residential collateralized debt obligations    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Collateralized debt obligations $ 53.0 $ 70.3
Weighted average interest rate (as a percent) 3.12% 2.16%