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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Components of accumulated other comprehensive loss $ 164,512 $ 153,966 $ 153,256 $ 120,061
Unrealized (Losses) Gains on Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Components of accumulated other comprehensive loss (3,199) (957) 40  
Pension Liability        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Components of accumulated other comprehensive loss (5,836) (6,135) (5,429)  
Accumulated Other Comprehensive Loss        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Components of accumulated other comprehensive loss $ (9,035) $ (7,092) $ (5,389) $ (6,024)