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Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss), before Tax |  | $ (214,481) | $ (104,352) |  |
Long-term obligations |  | 944,675 | 924,905 |  | $ 710,097
Deferred tax expense (benefit) |  | (79,289) | (39,912) |  |
Accumulated other comprehensive income (loss), net of tax |  | (135,192) | (64,440) |  | (52,981)
Income taxes |  | (125,585) | (122,028) |  | (65,032)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | [1] | 12,351 | 81 |  |
Securities gains (losses) |  | 26,673 | 10,817 |  | 29,096
Unrealized Gains on Investment Securities Available for Sale |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), before Tax |  | (72,707) | (24,504) |  |
Deferred tax expense (benefit) |  | (26,832) | (9,379) |  |
Accumulated other comprehensive income (loss), net of tax | [2] | (45,875) | (15,125) |  | 5,098
Income taxes | [1] | (9,869) | (4,138) |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | [1],[2] | 16,804 | 6,679 |  |
Securities gains (losses) | [1] | 26,673 | 10,817 |  |
Funded Status of Defined Benefit Plan |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), before Tax |  | (141,774) | (78,419) |  |
Deferred tax expense (benefit) |  | (52,457) | (29,996) |  |
Accumulated other comprehensive income (loss), net of tax | [2] | (89,317) | (48,423) |  | (55,415)
Income taxes | [1] | 2,616 | 4,988 |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | [1],[2] | (4,453) | (6,598) |  |
Employee Benefits, prior service costs | [1] | (210) | (210) |  |
Reclassification adjustment for losses included in income before income taxes | [1] | (6,859) | (11,376) |  |
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax |  | (7,069) | (11,586) | [1] |
Unrealized Loss on Cash Flow Hedges |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), before Tax |  | 0 | (1,429) |  |
Deferred tax expense (benefit) |  | 0 | (537) |  |
Accumulated other comprehensive income (loss), net of tax | [2] | 0 | (892) |  | $ (2,664)
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=66004124&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=66004124&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=66004124&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 of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 + Details
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- Definition Amount before tax of cost (credit) of benefit changes attributable to plan participants' prior service resulting from a plan amendment or plan initiation 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=66004124&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Prior Service Cost -URI http://asc.fasb.org/extlink&oid=49177896 Reference 3: 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=65897934&loc=d3e1928-114920 Reference 4: 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=66004124&loc=d3e637-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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