Other Comprehensive Income (Components of Accumulated Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Accumulated other comprehensive income, beginning balance	$ (1,553)	$ (10,499)
Other Comprehensive Income Before Reclassifcations	596	(1,055)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	180	2,236
Net other comprehensive income (loss)	776	1,181
Accumulated other comprehensive income, ending balance	(777)	(9,318)
Net Unrealized Gains on AFS Securities [Member]
Accumulated other comprehensive income, beginning balance	3,089	9,709
Other Comprehensive Income Before Reclassifcations	612	(1,053)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	393
Net other comprehensive income (loss)	612	(660)
Accumulated other comprehensive income, ending balance	3,701	9,049
Noncredit-related Impairment [Member]
Accumulated other comprehensive income, beginning balance	112	(1,937)
Other Comprehensive Income Before Reclassifcations	0	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	1,384
Net other comprehensive income (loss)	0	1,384
Accumulated other comprehensive income, ending balance	112	(553)
Net Unrealized Losses on Cash Flow Hedges [Member]
Accumulated other comprehensive income, beginning balance	(618)	(1,006)
Other Comprehensive Income Before Reclassifcations	(16)	(2)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	92	122
Net other comprehensive income (loss)	76	120
Accumulated other comprehensive income, ending balance	(542)	(886)
Pension Benefit Adjustment [Member]
Accumulated other comprehensive income, beginning balance	(4,136)	(17,265)
Other Comprehensive Income Before Reclassifcations	0	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	88	337
Net other comprehensive income (loss)	88	337
Accumulated other comprehensive income, ending balance	$ (4,048)	$ (16,928)