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Accumulated Other Comprehensive Income (Loss) (Components Of Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Other comprehensive income (loss), Pre-tax Amount $ (4,273) $ (3,772) $ 1,949
Other comprehensive income (loss), Tax Effect (1,649) (1,456) 773
Other comprehensive income (loss), before Reclassifications, Net-of-tax Amount (1,466) (1,483) 2,596
Reclassification, Net-of-tax Amount 1,158 833 1,420
Total other comprehensive (loss) income, net of tax (2,624) (2,316) 1,176
Securities Available for Sale and Transferred Securities [Member]      
Other comprehensive income (loss), before Reclassifications, Pre-tax Amount (2,146) (1,529) 14,008
Reclassification, Pre-tax Amount [1] 2,793 2,251 2,478
Other comprehensive income (loss), Pre-tax Amount (4,939) (3,780) 11,530
Other comprehensive income (loss), before Reclassifications, Tax Effect (828) (591) 5,549
Reclassification, Tax Effect [1] 1,078 868 981
Other comprehensive income (loss), Tax Effect (1,906) (1,459) 4,568
Other comprehensive income (loss), before Reclassifications, Net-of-tax Amount (1,318) (938) 8,459
Reclassification, Net-of-tax Amount [1] 1,715 1,383 1,497
Total other comprehensive (loss) income, net of tax (3,033) (2,321) 6,962
Pension And Post-Retirement Obligations [Member]      
Reclassification, Pre-tax Amount (907) (895)  
Reclassification, Tax Effect (350) (345)  
Other comprehensive income (loss), before Reclassifications, Net-of-tax Amount (148) (545) (5,863)
Reclassification, Net-of-tax Amount (557) (550) (77)
Total other comprehensive (loss) income, net of tax 409 5 (5,786)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member]      
Other comprehensive income (loss), Pre-tax Amount 241 887 9,709
Other comprehensive income (loss), Tax Effect 93 342 3,846
Total other comprehensive (loss) income, net of tax 148 545 5,863
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Including Portion Attributable to Noncontrolling Interest [Member]      
Other comprehensive income (loss), Pre-tax Amount 907 895 128
Other comprehensive income (loss), Tax Effect (350) (345) (51)
Total other comprehensive (loss) income, net of tax 557 550 77
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest [Member]      
Other comprehensive income (loss), Pre-tax Amount (666) (8) 9,581
Other comprehensive income (loss), Tax Effect (257) (3) 3,795
Total other comprehensive (loss) income, net of tax $ (409) $ (5) $ 5,786
[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.