Other Comprehensive Income (Loss) (Component Of Accumulated Other Comprehensive Income (Loss)) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	$ 0	$ 146	$ 0	$ 259
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	(20,537)	2,806	(22,916)	604
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	0	0		412
Other Comprehensive Income (Loss), Net of Tax	(20,537)	2,952	(22,916)	1,275
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Reclassification Adjustments, Net of Tax	(20,537)		(22,916)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments, Net of Tax	0		0
Changes in pension plan assets and benefit obligations, Net-of-tax amount	(27,134)	(20,542)	(27,134)	(20,542)	27,134	27,134	20,542	20,954
Unrealized gains on available-for-sale securities, Net-of-tax amount	(13,300)	13,277	(13,300)	13,277	7,237	9,616	10,471	12,673
Unrealized net holding loss on cash flow hedge, Net-of-tax amount	0	(291)	0	(291)	0	0	(437)	(550)
Total accumulated other comprehensive income (loss), Net-of-tax amount	$ (40,434)	$ (7,556)	$ (40,434)	$ (7,556)	$ (19,897)	$ (17,518)	$ (10,508)	$ (8,831)