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Commercial Mortgage-Backed Securities - Available-for-Sale Commercial Mortgage-Backed Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Estimated Fair Value    
Total investment in commercial mortgage-backed securities, at amortized cost and estimated fair value $ 75,414 $ 85,895
Commercial Mortgage-Backed Securities    
Amortized Cost    
After one, within five years 37,937 36,700
After five years 38,627 49,229
Total investment in commercial mortgage-backed securities, at amortized cost and estimated fair value 76,564 85,929
Estimated Fair Value    
After one, within five years 38,072 36,872
After five years 37,342 49,023
Total investment in commercial mortgage-backed securities, at amortized cost and estimated fair value $ 75,414 $ 85,895