Other Comprehensive Income (Components of Accumulated Other Comprehensive Income) (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
Accumulated other comprehensive income, beginning balance			$ (10,499)		$ (1,895)
Other Comprehensive Income Before Reclassifcations			(4,842)
Amounts Reclassified From Accumulated Other Comprehensive Income			2,646
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(3,377)	(638)	(2,196)		(141)
Accumulated other comprehensive income, ending balance	(12,695)	(2,036)	(12,695)		(2,036)
Net Unrealized Gains on AFS Securities [Member]
Accumulated other comprehensive income, beginning balance			9,711		13,143
Other Comprehensive Income Before Reclassifcations			(4,874)
Amounts Reclassified From Accumulated Other Comprehensive Income			393	[1]
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent			(4,481)		(596)
Accumulated other comprehensive income, ending balance	5,230	12,547	5,230		12,547
Noncredit-related Impairment [Member]
Accumulated other comprehensive income, beginning balance			(1,938)		(2,062)
Other Comprehensive Income Before Reclassifcations			0
Amounts Reclassified From Accumulated Other Comprehensive Income			1,384
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent			1,384		80
Accumulated other comprehensive income, ending balance	(554)	(1,982)	(554)		(1,982)
Net Unrealized Losses on Cash Flow Hedges [Member]
Accumulated other comprehensive income, beginning balance			(1,006)		(1,127)
Other Comprehensive Income Before Reclassifcations			32
Amounts Reclassified From Accumulated Other Comprehensive Income			240
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent			272		19
Accumulated other comprehensive income, ending balance	(734)	(1,108)	(734)		(1,108)
Pension Benefit Adjustment [Member]
Accumulated other comprehensive income, beginning balance			(17,266)		(11,849)
Other Comprehensive Income Before Reclassifcations			0
Amounts Reclassified From Accumulated Other Comprehensive Income			629
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent			629		356
Accumulated other comprehensive income, ending balance	$ (16,637)	$ (11,493)	$ (16,637)		$ (11,493)

[1] Reported as total other-than-temporary impairment losses on securities in the Consolidated Income Statement.