Accumulated Other Comprehensive Income (Loss) (Reclassifications out of AOCI) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Securities gains (losses)		$ 5,564	$ 0	$ 10,837	$ 0
Reclassification adjustment for losses included in income before income taxes		2,916	822	8,689	4,019
Amounts reclassified from accumulated other comprehensive income, net of tax		(1,632)	503	(1,327)	2,456
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)		5,564		10,837
Income taxes		(2,094)		(4,145)
Amounts reclassified from accumulated other comprehensive income, net of tax	[1]	(3,470)	0	(6,692)	0
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 losses included in income before income taxes		(2,863)	(769)	(8,531)	(3,861)
Total before taxes		(2,916)	(822)	(8,689)	(4,019)
Income taxes		1,078	319	3,324	1,563
Amounts reclassified from accumulated other comprehensive income, net of tax	[1]	$ 1,838	$ 503	$ 5,365	$ 2,456

[1] All amounts are net of tax.