Accumulated Other Comprehensive Loss (Reclassifications out of AOCI) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification adjustment for gains included in income before income taxes	$ 1,598		$ 4,294		$ 3,197		$ 8,598
Amounts reclassified from accumulated other comprehensive income, net of tax	976		2,612		1,953		5,231
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	(52)		(53)		(105)		(105)
Reclassification adjustment for gains included in income before income taxes	(1,546)		(4,241)		(3,092)		(8,493)
Total before taxes	(1,598)		(4,294)		(3,197)		(8,598)
Income taxes	622		1,682		1,244		3,367
Amounts reclassified from accumulated other comprehensive income, net of tax	$ 976	[1]	$ 2,612	[1]	$ 1,953	[1]	$ 5,231	[1]

[1] All amounts are net of tax.