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Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss), before Tax |  | $ (193,833) | $ (214,481) |  |
Long-term obligations |  | 1,059,896 | 944,675 |  | $ 924,905
Deferred tax expense (benefit) |  | (71,539) | (79,289) |  |
Accumulated other comprehensive income (loss), net of tax |  | (122,294) | (135,192) |  | (64,440)
Income taxes |  | (219,946) | (125,585) |  | (122,028)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | [1] | (3,419) | 12,351 |  |
Securities gains (losses) |  | 4,293 | 26,673 |  | 10,817
Unrealized Gains on Investment Securities Available for Sale |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), before Tax |  | (48,834) | (72,707) |  |
Deferred tax expense (benefit) |  | (17,889) | (26,832) |  |
Accumulated other comprehensive income (loss), net of tax | [2] | (30,945) | (45,875) |  | (15,125)
Income taxes | [1] | (1,588) | (9,869) |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | [1],[2] | 2,705 | 16,804 |  |
Securities gains (losses) | [1] | 4,293 | 26,673 |  |
Funded Status of Defined Benefit Plan |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), before Tax |  | (144,999) | (141,774) |  |
Deferred tax expense (benefit) |  | (53,650) | (52,457) |  |
Accumulated other comprehensive income (loss), net of tax | [2] | (91,349) | (89,317) |  | (48,423)
Income taxes | [1] | 3,596 | 2,616 |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | [1],[2] | (6,124) | (4,453) |  |
Employee Benefits, prior service costs | [1] | (210) | (210) |  |
Reclassification adjustment for losses included in income before income taxes | [1] | (9,510) | (6,859) |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax |  | (9,720) | (7,069) | [1] |
Unrealized Loss on Cash Flow Hedges |  |  |  |  |
Accumulated other comprehensive income (loss), net of tax | [2] | 0 | 0 |  | $ (892)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | [2] | $ 0 | $ 0 |  |
[1] | Amounts in parentheses indicate debits to profit/loss.
[2] | All amounts are net of tax. Amounts in parentheses indicate debits.

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- Definition Amount before tax of increase (decrease) in accumulated equity from transactions and other events and circumstances from non-owner sources, including portion attributable to noncontrolling interest. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners). + References No definition available. + Details
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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 3: 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=84228862&loc=SL7669686-108580 + Details
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- Definition The net gain (loss) realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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- Definition Amount, before tax, of cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 + Details
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