Accumulated Other Comprehensive Income (Schedule Of Accumulated Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013		Dec. 31, 2013		Dec. 31, 2012
Accumulated other comprehensive income	$ 84,314		$ 21,864		$ 84,314		$ 21,864		$ 9,731		$ 136,344
Other Comprehensive Income Before Reclassifications					114,971		(185,733)
Reclassified from Accumulated Oher Comprehensive Income					5,324		1,088
Other Comprehensive Income (Loss), before Tax					120,295		(184,645)
Other Comprehensive Income (Loss), Tax					(45,712)		70,165
Other Comprehensive Income (Loss), Net of Tax	43,815		(107,899)		74,583		(114,480)
Unrealized Gain Loss on Securities OTTI [Member]
Accumulated other comprehensive income	4,311	[1]	4,262	[1]	4,311	[1]	4,262	[1]	4,203	[1]	3,245	[1]
Other Comprehensive Income Before Reclassifications					(803)	[1]	710	[1]
Reclassified from Accumulated Oher Comprehensive Income					977	[1]	930	[1]
Other Comprehensive Income (Loss), before Tax					174	[1]	1,640	[1]
Other Comprehensive Income (Loss), Tax					66	[1]	623	[1]
Other Comprehensive Income (Loss), Net of Tax					108	[1]	1,017	[1]
Unrealized Gain Loss on Securities Other [Member]
Accumulated other comprehensive income	95,332	[1]	43,816	[1]	95,332	[1]	43,816	[1]	21,303	[1]	160,263	[1]
Other Comprehensive Income Before Reclassifications					115,774	[1]	(186,443)	[1]
Reclassified from Accumulated Oher Comprehensive Income					3,627	[1]	(1,375)	[1]
Other Comprehensive Income (Loss), before Tax					119,401	[1]	(187,818)	[1]
Other Comprehensive Income (Loss), Tax					45,372	[1]	(71,371)	[1]
Other Comprehensive Income (Loss), Net of Tax					74,029	[1]	(116,447)	[1]
Pension Loss [Member]
Accumulated other comprehensive income	(15,329)	[2]	(26,214)	[2]	(15,329)	[2]	(26,214)	[2]	(15,775)	[2]	(27,164)	[2]
Other Comprehensive Income Before Reclassifications					0	[2]	0	[2]
Reclassified from Accumulated Oher Comprehensive Income					720	[2]	1,533	[2]
Other Comprehensive Income (Loss), before Tax					720	[2]	1,533	[2]
Other Comprehensive Income (Loss), Tax					274	[2]	583	[2]
Other Comprehensive Income (Loss), Net of Tax					$ 446	[2]	$ 950	[2]

[1] The pre-tax amounts reclassified from accumulated other comprehensive income are included in "investment securities gains (losses), net" in the consolidated statements of income.

[2] The pre-tax amounts reclassified from accumulated other comprehensive income are included in the computation of net periodic pension cost as "amortization of unrecognized net loss" (see Note 7).