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Accumulated Other Comprehensive Income (Loss) (Components Of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 12 Months Ended
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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.

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- Definition Amount before tax and reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 + Details
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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=51821188&loc=d3e1436-108581 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 + Details
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