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Commercial Mortgage Loans Held for Investment - Additional Information (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2019
USD ($)
Loan
Rating
Dec. 31, 2018
USD ($)
Loan
Rating
Mortgage Loans On Real Estate [Abstract]    
Weighted average risk rating | Rating 2 2
Allowance for loan losses | $ $ 0 $ 0
Number of loans risk rated two 20 17
Number of loans risk rated three 1 1