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Accumulated Other Comprehensive Income (Loss) (Components Of Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other comprehensive income (loss), Pre-tax Amount $ 3,313 $ (4,273) $ (3,772)
Other comprehensive income (loss), Tax Effect 1,278 (1,649) (1,456)
Other comprehensive income (loss), before Reclassifications, Net-of-tax Amount 2,028 (1,466) (1,483)
Amounts reclassified from accumulated other comprehensive income (loss) 7 (1,158) (833)
Total other comprehensive income (loss), net of tax 2,035 (2,624) (2,316)
Securities Available for Sale and Transferred Securities [Member]      
Other comprehensive income (loss), before Reclassifications, Pre-tax Amount 1,841 (2,146) (1,529)
Reclassification, Pre-tax Amount [1] (1,103) (2,793) (2,251)
Other comprehensive income (loss), Pre-tax Amount 738 (4,939) (3,780)
Other comprehensive income (loss), before Reclassifications, Tax Effect 710 (828) (591)
Reclassification, Tax Effect [1] (426) (1,078) (868)
Other comprehensive income (loss), Tax Effect 284 (1,906) (1,459)
Other comprehensive income (loss), before Reclassifications, Net-of-tax Amount 1,131 (1,318) (938)
Amounts reclassified from accumulated other comprehensive income (loss) [1] (677) (1,715) (1,383)
Total other comprehensive income (loss), net of tax 454 (3,033) (2,321)
Pension And Post-Retirement Obligations [Member]      
Reclassification, Pre-tax Amount 1,115 907  
Reclassification, Tax Effect 431 350  
Other comprehensive income (loss), before Reclassifications, Net-of-tax Amount 897 (148) (545)
Amounts reclassified from accumulated other comprehensive income (loss) 684 557 550
Total other comprehensive income (loss), net of tax 1,581 409 5
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Including Portion Attributable to Noncontrolling Interest [Member]      
Other comprehensive income (loss), Pre-tax Amount 1,115 907 895
Other comprehensive income (loss), Tax Effect 431 350 345
Total other comprehensive income (loss), net of tax 684 557 550
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member]      
Other comprehensive income (loss), Pre-tax Amount 1,460 (241) (887)
Other comprehensive income (loss), Tax Effect 563 (93) (342)
Total other comprehensive income (loss), net of tax 897 (148) (545)
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest [Member]      
Other comprehensive income (loss), Pre-tax Amount 2,575 666 8
Other comprehensive income (loss), Tax Effect 994 257 3
Total other comprehensive income (loss), net of tax $ 1,581 $ 409 $ 5
[1] Includes amounts related to the amortization/accretion of unrealized net gains and losses related to the Company's reclassification of available for sale investment securities to the held to maturity category. The unrealized net gains/losses will be amortized/accreted over the remaining life of the investment securities as an adjustment of yield.