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Investments - Amortized Costs (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Available-for-sale    
Aggregate Fair Value $ 5,328 $ 5,429
Held-to-maturity    
Held-to-maturity    
Amortized Cost 0 57,204
Gross Unrealized Gains   0
Gross Unrealized Losses   14,249
Aggregate Fair Value   42,955
Available-for-sale    
Available-for-sale    
Amortized Cost 5,467 5,452
Gross Unrealized Gains 0 0
Gross Unrealized Losses 139 23
Aggregate Fair Value $ 5,328 $ 5,429