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Accumulated Other Comprehensive Income (Loss) (Components Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance     $ 381,177 $ 320,054
Other comprehensive income (loss) before reclassifications $ (2,327) $ 1,834 (8,762) 2,553
Amounts reclassified from accumulated other comprehensive income (loss) 194 59 382 105
Total other comprehensive (loss) income, net of tax (2,133) 1,893 (8,380) 2,658
Balance 386,937 347,641 386,937 347,641
Hedging Derivative Instruments [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance (104)      
Other comprehensive income (loss) before reclassifications 227   123  
Total other comprehensive (loss) income, net of tax 227   123  
Balance 123   123  
Securities Available-For-Sale and Transferred Securities [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance (9,545) (3,135) (3,275) (3,729)
Other comprehensive income (loss) before reclassifications (2,554) 1,834 (8,885) 2,553
Amounts reclassified from accumulated other comprehensive income (loss) 67 (112) 128 (237)
Total other comprehensive (loss) income, net of tax (2,487) 1,722 (8,757) 2,316
Balance (12,032) (1,413) (12,032) (1,413)
Pension And Post-Retirement Obligations [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance (8,514) (10,051) (8,641) (10,222)
Amounts reclassified from accumulated other comprehensive income (loss) 127 171 254 342
Total other comprehensive (loss) income, net of tax 127 171 254 342
Balance (8,387) (9,880) (8,387) (9,880)
Accumulated Other Comprehensive Loss [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance (18,163) (13,186) (11,916) (13,951)
Total other comprehensive (loss) income, net of tax (2,133) 1,893 (8,380) 2,658
Balance $ (20,296) $ (11,293) $ (20,296) $ (11,293)