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Accumulated Other Comprehensive Income (Loss) (Components Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance $ 320,054 $ 293,844 $ 279,532
Other comprehensive income (loss) before reclassifications 2,028 (1,466) (1,483)
Amounts reclassified from accumulated other comprehensive income (loss) 7 (1,158) (833)
Net current period other comprehensive (loss) income 2,035 (2,624) (2,316)
Balance 381,177 320,054 293,844
Accumulated Other Comprehensive Income (Loss) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (13,951) (11,327) (9,011)
Net current period other comprehensive (loss) income 2,035 (2,624) (2,316)
Balance (11,916) (13,951) (11,327)
Securities Available-For-Sale and Transferred Securities [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (3,729) (696) 1,625
Other comprehensive income (loss) before reclassifications 1,131 (1,318) (938)
Amounts reclassified from accumulated other comprehensive income (loss) (677) (1,715) (1,383)
Net current period other comprehensive (loss) income 454 (3,033) (2,321)
Balance (3,275) (3,729) (696)
Pension And Post-Retirement Obligations [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (10,222) (10,631) (10,636)
Other comprehensive income (loss) before reclassifications 897 (148) (545)
Amounts reclassified from accumulated other comprehensive income (loss) 684 557 550
Net current period other comprehensive (loss) income 1,581 409 5
Balance $ (8,641) $ (10,222) $ (10,631)