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Accumulated Other Comprehensive Income (Loss) (Components Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance $ 320,054 $ 293,844
Other comprehensive income (loss) before reclassifications 719 7,490
Amounts reclassified from accumulated other comprehensive income 46 (268)
Net current period other comprehensive (loss) income 765 7,222
Balance 325,688 313,953
Accumulated Other Comprehensive Loss [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance (13,951) (11,327)
Net current period other comprehensive (loss) income 765 7,222
Balance (13,186) (4,105)
Securities Available-For-Sale and Transferred Securities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance (3,729) (696)
Other comprehensive income (loss) before reclassifications 719 7,490
Amounts reclassified from accumulated other comprehensive income (125) (407)
Net current period other comprehensive (loss) income 594 7,083
Balance (3,135) 6,387
Pension And Post-Retirement Obligations [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance (10,222) (10,631)
Amounts reclassified from accumulated other comprehensive income 171 139
Net current period other comprehensive (loss) income 171 139
Balance $ (10,051) $ (10,492)