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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Components of accumulated other comprehensive loss $ 256,723 $ 252,190 $ 246,994 $ 189,516 $ 186,074 $ 180,884 $ 173,793 $ 168,137
Unrealized Gains on Securities                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Components of accumulated other comprehensive loss 4,874     1,261 1,263      
Pension Liability                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Components of accumulated other comprehensive loss (6,720)     (7,114) (7,073)      
Accumulated Other Comprehensive Loss                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Components of accumulated other comprehensive loss $ (1,846) $ (1,620) $ (2,520) $ (5,853) $ (5,810) $ (6,292) $ (7,943) $ (9,217)