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Accumulated Other Comprehensive Income (Loss) (Components Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance     $ 381,177 $ 320,054
Other comprehensive income (loss) before reclassifications $ (1,808) $ 363 (10,570) 2,916
Amounts reclassified from accumulated other comprehensive income (loss) 284 92 666 197
Total other comprehensive (loss) income, net of tax (1,524) 455 (9,904) 3,113
Balance 392,154 366,002 392,154 366,002
Hedging Derivative Instruments [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance 123      
Other comprehensive income (loss) before reclassifications 85   208  
Total other comprehensive (loss) income, net of tax 85   208  
Balance 208   208  
Securities Available-For-Sale and Transferred Securities [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance (12,032) (1,413) (3,275) (3,729)
Other comprehensive income (loss) before reclassifications (1,893) 363 (10,778) 2,916
Amounts reclassified from accumulated other comprehensive income (loss) 157 (79) 285 (316)
Total other comprehensive (loss) income, net of tax (1,736) 284 (10,493) 2,600
Balance (13,768) (1,129) (13,768) (1,129)
Pension And Post-Retirement Obligations [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance (8,387) (9,880) (8,641) (10,222)
Amounts reclassified from accumulated other comprehensive income (loss) 127 171 381 513
Total other comprehensive (loss) income, net of tax 127 171 381 513
Balance (8,260) (9,709) (8,260) (9,709)
Accumulated Other Comprehensive Loss [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance (20,296) (11,293) (11,916) (13,951)
Total other comprehensive (loss) income, net of tax (1,524) 455 (9,904) 3,113
Balance $ (21,820) $ (10,838) $ (21,820) $ (10,838)