Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss), before Tax	$ (86,690)		$ (41,434)
Long-term obligations	710,097		740,186		914,688
Deferred tax expense (benefit)	(33,709)		(16,166)
Accumulated other comprehensive income (loss), net of tax	(52,981)		(25,268)		(82,106)
Income taxes	(65,032)		(101,574)		(64,729)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(21,146)	[1]	(10,506)	[1]
Securities gains (losses)	29,096		0		2,277
Unrealized Gains on Investment Securities Available for Sale
Accumulated Other Comprehensive Income (Loss), before Tax	8,343		(16,632)
Deferred tax expense (benefit)	3,245		(6,541)
Accumulated other comprehensive income (loss), net of tax	5,098	[2]	(10,091)	[2]	20,517	[2]
Income taxes	11,224	[1]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(17,872)	[1],[2]	0	[2]
Securities gains (losses)	(29,096)	[1]
Funded Status of Defined Benefit Plan
Accumulated Other Comprehensive Income (Loss), before Tax	(90,696)		(17,582)
Deferred tax expense (benefit)	(35,281)		(6,839)
Accumulated other comprehensive income (loss), net of tax	(55,415)	[2]	(10,743)	[2]	(96,331)	[2]
Income taxes	2,084	[1]	6,689	[1]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(3,274)	[1],[2]	(10,506)	[1],[2]
Employee Benefits, prior service costs	(210)	[1]	(210)	[1]
Reclassification adjustment for losses included in income before income taxes	(5,148)	[1]	(16,985)	[1]
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax	(5,358)		(17,195)	[1]
Unrealized Loss on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss), before Tax	(4,337)		(7,220)
Deferred tax expense (benefit)	(1,673)		(2,786)
Accumulated other comprehensive income (loss), net of tax	(2,664)	[2]	(4,434)	[2]	(6,292)	[2]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	$ 0	[2]	$ 0	[2]

[1] (Dollars in thousands) Year ended December 31, 2014Details about accumulated other comprehensive loss Amount reclassified from accumulated other comprehensive income (loss)(1) Affected line item in the statement where net income is presentedUnrealized gains and losses on available for sale securities $(29,096) Securities gains 11,224 Income taxes $(17,872) Net income Amortization of defined benefit pension items Prior service costs $(210) Employee benefitsActuarial losses (5,148) Employee benefits (5,358) Income before income taxes 2,084 Income taxes $(3,274) Net incomeTotal reclassifications for the period $(21,146) Year ended December 31, 2013Details about accumulated other comprehensive loss Amount reclassified from accumulated other comprehensive income (loss)(1) Affected line item in the statement where net income is presentedAmortization of defined benefit pension items Prior service costs $(210) Employee benefitsActuarial losses (16,985) Employee benefits (17,195) Income before income taxes 6,689 Income taxes $(10,506) Net incomeTotal reclassifications for the period $(10,506) (1) Amounts in parentheses indicate debits to profit/loss.

[2] All amounts are net of tax. Amounts in parentheses indicate debits.