Other Comprehensive Income (Loss) (Component Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income before reclassifications	$ 6,551	$ (2,905)	$ 6,179	$ 21,128
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	0	0	0	0
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, before Tax	0	0	0	13
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0	0	13
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	6,551	(2,905)	6,179	21,115
Other comprehensive income (loss)	6,551	(2,905)	6,179	21,115
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Reclassification Adjustments, Net of Tax	6,551	(2,905)	6,179	21,128
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments, Net of Tax		0	0	0
Changes in pension plan assets and benefit obligations, Net-of-tax amount	(14,865)	(5,598)	(14,865)	(5,598)	$ 14,865	$ 14,865	$ 5,598	$ 5,598
Unrealized gains on available-for-sale securities, Net-of-tax amount	7,436	(8,706)	7,436	(8,706)	885	1,257	(5,801)	(29,821)
Total accumulated other comprehensive income (loss), Net-of-tax amount	$ (7,429)	(14,304)	(7,429)	(14,304)	$ (13,980)	$ (13,608)	$ (11,399)	$ (35,419)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, before Tax		$ 0	$ 0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax				$ 20