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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Components of accumulated other comprehensive loss $ 123,844 $ 120,061 $ 119,277 $ 114,715
Unrealized (Losses) Gains on Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Components of accumulated other comprehensive loss (13) (266) 1,987  
Pension Liability        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Components of accumulated other comprehensive loss (5,539) (5,758) (5,665)  
Accumulated Other Comprehensive Loss        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Components of accumulated other comprehensive loss $ (5,552) $ (6,024) $ (3,678) $ (4,726)