Accumulated Other Comprehensive Loss (Reclassifications out of AOCI) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Securities gains (losses)		$ 147	$ 0	$ 5,273	$ 0
Reclassification adjustment for losses included in income before income taxes		2,887	1,598	5,773	3,197
Amounts reclassified from accumulated other comprehensive income, net of tax		1,691	976	305	1,953
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	[1]	0	0	0	0
Unrealized Gains on Investment Securities Available for Sale
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Securities gains (losses)		147		5,273
Income taxes		(74)		(2,051)
Amounts reclassified from accumulated other comprehensive income, net of tax	[1]	(73)	0	(3,222)	0
Defined Benefit Pension Items
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Employee Benefits, prior service costs		(52)	(52)	(105)	(105)
Reclassification adjustment for losses included in income before income taxes		(2,835)	(1,546)	(5,668)	(3,092)
Total before taxes		(2,887)	(1,598)	(5,773)	(3,197)
Income taxes		1,123	622	2,246	1,244
Amounts reclassified from accumulated other comprehensive income, net of tax	[1]	$ 1,764	$ 976	$ 3,527	$ 1,953

[1] All amounts are net of tax.