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Residential Collateralized Debt Obligations (Details)
$ in Thousands
Jun. 30, 2019
USD ($)
securitization
Dec. 31, 2018
USD ($)
securitization
Debt Instrument [Line Items]    
Pledged assets $ 48,799 $ 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 52,000 60,200
Residential collateralized debt obligations    
Debt Instrument [Line Items]    
Secured debt, carrying value $ 45,300 $ 53,000
Weighted average interest rate 3.02% 3.12%
Adjustable Rate Residential Mortgage | Residential collateralized debt obligations    
Debt Instrument [Line Items]    
Pledged assets $ 48,800 $ 56,800