Accumulated Other Comprehensive Loss (Reclassifications out of AOCI) (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
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification adjustment for gains included in income before income taxes	$ 822		$ 4,298		$ 4,019		$ 12,896
Amounts reclassified from accumulated other comprehensive income, net of tax	503		2,237		2,456		7,468
Unrealized Loss on Cash Flow Hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts reclassified from accumulated other comprehensive income, net of tax	0	[1]	0	[1]	0	[1]	0	[1]
Unrealized Gains on Investment Securities Available for Sale
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts reclassified from accumulated other comprehensive income, net of tax	0	[1]	0	[1]	0	[1]	0	[1]
Defined Benefit Pension Items
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Employee Benefits, prior service costs	(53)		(53)		(158)		(158)
Reclassification adjustment for gains included in income before income taxes	(769)		(4,245)		(3,861)		(12,738)
Total before taxes	(822)		(4,298)		(4,019)		(12,896)
Income taxes	319		2,061		1,563		5,428
Amounts reclassified from accumulated other comprehensive income, net of tax	$ 503	[1]	$ 2,237	[1]	$ 2,456	[1]	$ 7,468	[1]

[1] All amounts are net of tax.