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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Components of accumulated other comprehensive loss $ 266,366 $ 257,612 $ 257,972 $ 252,190 $ 246,994 $ 189,516
Unrealized Gains on Securities            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Components of accumulated other comprehensive loss 742   4,645 5,232    
Pension Liability            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Components of accumulated other comprehensive loss (9,795)   (10,283) (6,852)    
Accumulated Other Comprehensive Loss            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Components of accumulated other comprehensive loss $ (9,053) $ (11,473) $ (5,638) $ (1,620) $ (2,520) $ (5,853)