Accumulated Other Comprehensive Income (Schedule Of Accumulated Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013		Dec. 31, 2013		Dec. 31, 2012
Accumulated other comprehensive income	$ 40,499		$ 129,763		$ 9,731		$ 136,344
Other Comprehensive Income Before Reclassifications	43,723		(11,823)
Reclassified from Accumulated Oher Comprehensive Income	5,903		1,209
Other Comprehensive Income (Loss), before Tax	49,626		(10,614)
Other Comprehensive Income (Loss), Tax	(18,858)		4,033
Other Comprehensive Income (Loss), Net of Tax	30,768		(6,581)
Unrealized Gain Loss on Securities OTTI [Member]
Accumulated other comprehensive income	4,369	[1]	4,382	[1]	4,203	[1]	3,245	[1]
Other Comprehensive Income Before Reclassifications	(78)	[1]	1,392	[1]
Reclassified from Accumulated Oher Comprehensive Income	346	[1]	442	[1]
Other Comprehensive Income (Loss), before Tax	268	[1]	1,834	[1]
Other Comprehensive Income (Loss), Tax	102	[1]	697	[1]
Other Comprehensive Income (Loss), Net of Tax	166	[1]	1,137	[1]
Unrealized Gain Loss on Securities Other [Member]
Accumulated other comprehensive income	51,682	[1]	152,070	[1]	21,303	[1]	160,263	[1]
Other Comprehensive Income Before Reclassifications	43,801	[1]	(13,215)	[1]
Reclassified from Accumulated Oher Comprehensive Income	5,197	[1]	0	[1]
Other Comprehensive Income (Loss), before Tax	48,998	[1]	(13,215)	[1]
Other Comprehensive Income (Loss), Tax	18,619	[1]	(5,022)	[1]
Other Comprehensive Income (Loss), Net of Tax	30,379	[1]	(8,193)	[1]
Pension Loss [Member]
Accumulated other comprehensive income	(15,552)	[2]	(26,689)	[2]	(15,775)	[2]	(27,164)	[2]
Other Comprehensive Income Before Reclassifications	0	[2]	0	[2]
Reclassified from Accumulated Oher Comprehensive Income	360	[2]	767	[2]
Other Comprehensive Income (Loss), before Tax	360	[2]	767	[2]
Other Comprehensive Income (Loss), Tax	137	[2]	292	[2]
Other Comprehensive Income (Loss), Net of Tax	$ 223	[2]	$ 475	[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).