Other Comprehensive Income (Components of Accumulated Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Accumulated other comprehensive income (loss), beginning balance			$ (1,553)	$ (10,499)
Other Comprehensive Income Before Reclassifcations			1,447	(5,018)
Amounts reclassed from accumulated other comprehensive income			527	14,177
Net other comprehensive income (loss)	(779)	11,355	1,974	9,159
Accumulated other comprehensive income (loss), ending balance	421	(1,340)	421	(1,340)
Net Unrealized Gains on AFS Securities [Member]
Accumulated other comprehensive income (loss), beginning balance			3,089	9,709
Other Comprehensive Income Before Reclassifcations			1,476	(5,003)
Amounts reclassed from accumulated other comprehensive income			0	393
Net other comprehensive income (loss)			1,476	(4,610)
Accumulated other comprehensive income (loss), ending balance	4,565	5,099	4,565	5,099
Noncredit-related Impairment [Member]
Accumulated other comprehensive income (loss), beginning balance			112	(1,937)
Other Comprehensive Income Before Reclassifcations			0	0
Amounts reclassed from accumulated other comprehensive income			0	1,384
Net other comprehensive income (loss)			0	1,384
Accumulated other comprehensive income (loss), ending balance	112	(553)	112	(553)
Net Unrealized Losses on Cash Flow Hedges [Member]
Accumulated other comprehensive income (loss), beginning balance			(618)	(1,006)
Other Comprehensive Income Before Reclassifcations			(29)	(15)
Amounts reclassed from accumulated other comprehensive income			277	331
Net other comprehensive income (loss)			248	316
Accumulated other comprehensive income (loss), ending balance	(370)	(690)	(370)	(690)
Pension Benefit Adjustment [Member]
Accumulated other comprehensive income (loss), beginning balance			(4,136)	(17,265)
Other Comprehensive Income Before Reclassifcations			0	0
Amounts reclassed from accumulated other comprehensive income			250	12,069
Net other comprehensive income (loss)			250	12,069
Accumulated other comprehensive income (loss), ending balance	$ (3,886)	$ (5,196)	$ (3,886)	$ (5,196)