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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Components of accumulated other comprehensive loss $ 257,612 $ 257,972 $ 246,994 $ 189,516
Unrealized (Losses) Gains on Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Components of accumulated other comprehensive loss (1,434) 4,645 4,463  
Pension Liability        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Components of accumulated other comprehensive loss (10,039) (10,283) (6,983)  
Accumulated Other Comprehensive Loss        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Components of accumulated other comprehensive loss $ (11,473) $ (5,638) $ (2,520) $ (5,853)