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Residential Collateralized Debt Obligations (Details)
$ in Thousands
Mar. 31, 2019
USD ($)
securitization
Dec. 31, 2018
USD ($)
securitization
Debt Instrument [Line Items]    
Mortgage Loans on Real Estate, Commercial and Consumer, Net $ 52,869 $ 56,795
Number of residential CDO securitizations | securitization 3 3
CDOs outstanding $ 4,800 $ 4,800
Arm Loans    
Debt Instrument [Line Items]    
Loans pledged as collateral 56,100 60,200
Residential collateralized debt obligations    
Debt Instrument [Line Items]    
Secured debt, carrying value $ 49,200 $ 53,000
Weighted average interest rate 3.10% 3.12%
Adjustable Rate Residential Mortgage | Residential collateralized debt obligations    
Debt Instrument [Line Items]    
Mortgage Loans on Real Estate, Commercial and Consumer, Net $ 52,900 $ 56,800