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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Components of accumulated other comprehensive loss $ 252,190 $ 246,994 $ 189,516 $ 180,884 $ 173,793 $ 168,137
Unrealized Gains on Securities            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Components of accumulated other comprehensive loss 5,232   1,261 946    
Pension Liability            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Components of accumulated other comprehensive loss (6,852)   (7,114) (7,238)    
Accumulated Other Comprehensive Loss            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Components of accumulated other comprehensive loss $ (1,620) $ (2,520) $ (5,853) $ (6,292) $ (7,943) $ (9,217)