Components of Other Comprehensive Income/(Loss) (Schedule of Reclassification from AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Debt securities gains/(losses), net	$ 0	$ 405	$ 52	$ 449
Interest and fees on loans	323,974	192,580	623,467	373,044
All other expense	50,999	25,216	86,331	44,441
Provision/(benefit) for income taxes	19,697	17,253	49,628	44,307
Total reclassification from AOCI	2,522	249	3,615	543
Securities AFS
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total reclassification from AOCI	0	(250)	(39)	(277)
Cash flow hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total reclassification from AOCI	463	(904)	308	(1,756)
Pension and Postretirement Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total reclassification from AOCI	2,059	1,403	3,346	2,576
Reclassifications from AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total reclassification from AOCI	2,522	249	3,615	543
Reclassifications from AOCI | Securities AFS
Accumulated Other Comprehensive Income (Loss) [Line Items]
Debt securities gains/(losses), net	0	(405)	(52)	(449)
Provision/(benefit) for income taxes	0	155	13	172
Total reclassification from AOCI	0	(250)	(39)	(277)
Reclassifications from AOCI | Cash flow hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Interest and fees on loans	615	(1,465)	409	(2,845)
Provision/(benefit) for income taxes	(152)	561	(101)	1,089
Total reclassification from AOCI	463	(904)	308	(1,756)
Reclassifications from AOCI | Pension and Postretirement Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
All other expense	2,735	2,273	4,444	4,173
Provision/(benefit) for income taxes	(676)	(870)	(1,098)	(1,597)
Total reclassification from AOCI	$ 2,059	$ 1,403	$ 3,346	$ 2,576