Components of Other Comprehensive Income/(loss) (Schedule of Reclassification from AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total reclassification from AOCI	$ 761	$ 604	$ 1,304	$ 806
Securities AFS
Accumulated Other Comprehensive Income (Loss) [Line Items]
Realized (gains)/losses	(1)	0	(450)	(1,654)
Tax expense/(benefit)	0	0	172	634
Total reclassification from AOCI	(1)	0	(278)	(1,020)
Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Realized (gains)/losses	(1,041)	(582)	(3,886)	(1,795)
Tax expense/(benefit)	398	223	1,487	688
Total reclassification from AOCI	(643)	(359)	(2,399)	(1,107)
Pension and Postretirement Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Realized (gains)/losses	2,277	1,561	6,450	4,756
Tax expense/(benefit)	(872)	(598)	(2,469)	(1,823)
Total reclassification from AOCI	$ 1,405	$ 963	$ 3,981	$ 2,933