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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Schedule Of Components Of The Accumulated Other Comprehensive Income, Net Of Taxes) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Loss [Line Items]      
Components of accumulated other comprehensive loss $ 257,972 $ 189,516 $ 168,137
Unrealized Gains on Securities      
Accumulated Other Comprehensive Loss [Line Items]      
Components of accumulated other comprehensive loss 4,645 1,261  
Pension Liability      
Accumulated Other Comprehensive Loss [Line Items]      
Components of accumulated other comprehensive loss (10,283) (7,114)  
Accumulated Other Comprehensive Loss      
Accumulated Other Comprehensive Loss [Line Items]      
Components of accumulated other comprehensive loss $ (5,638) $ (5,853) $ (9,217)