Loans and Allowance for Credit Losses Summary of Delinquency and Non-Performing Status by Portfolio Segment (Details) (USD $) In Thousands, unless otherwise specified																										3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Mar. 31, 2014 Commercial - Unsecured [Member]	Dec. 31, 2013 Commercial - Unsecured [Member]	Mar. 31, 2014 Commercial Loans, Commerical Mortgages, Constructions Loans [Member]	Dec. 31, 2013 Commercial Loans, Commerical Mortgages, Constructions Loans [Member]	Mar. 31, 2014 Real-estate - home equity [Member]	Dec. 31, 2013 Real-estate - home equity [Member]	Mar. 31, 2013 Real-estate - home equity [Member]	Mar. 31, 2014 Real-estate - residential mortgage [Member]	Dec. 31, 2013 Real-estate - residential mortgage [Member]	Mar. 31, 2013 Real-estate - residential mortgage [Member]	Mar. 31, 2014 Construction other [Member]	Dec. 31, 2013 Construction other [Member]	Mar. 31, 2014 Total Consumer	Dec. 31, 2013 Total Consumer	Mar. 31, 2013 Total Consumer	Mar. 31, 2014 Consumer - direct [Member]	Dec. 31, 2013 Consumer - direct [Member]	Mar. 31, 2014 Consumer - Indirect [Member]	Dec. 31, 2013 Consumer - Indirect [Member]	Mar. 31, 2014 Leasing and other and overdrafts [Member]	Dec. 31, 2013 Leasing and other and overdrafts [Member]	Mar. 31, 2013 Leasing and other and overdrafts [Member]	Mar. 31, 2014 Nonperforming Financing Receivable [Member]	Mar. 31, 2014 Nonperforming Financing Receivable [Member] Commercial Loans, Commerical Mortgages, Constructions Loans [Member]	Dec. 31, 2013 Nonperforming Financing Receivable [Member] Commercial Loans, Commerical Mortgages, Constructions Loans [Member]	Mar. 31, 2014 Nonperforming Financing Receivable [Member] Real-estate - home equity [Member]	Dec. 31, 2013 Nonperforming Financing Receivable [Member] Real-estate - home equity [Member]	Mar. 31, 2014 Nonperforming Financing Receivable [Member] Real-estate - residential mortgage [Member]	Dec. 31, 2013 Nonperforming Financing Receivable [Member] Real-estate - residential mortgage [Member]	Mar. 31, 2014 Nonperforming Financing Receivable [Member] Construction other [Member]	Dec. 31, 2013 Nonperforming Financing Receivable [Member] Construction other [Member]	Mar. 31, 2014 Nonperforming Financing Receivable [Member] Total Consumer	Dec. 31, 2013 Nonperforming Financing Receivable [Member] Total Consumer	Mar. 31, 2014 Nonperforming Financing Receivable [Member] Consumer - direct [Member]	Dec. 31, 2013 Nonperforming Financing Receivable [Member] Consumer - direct [Member]	Mar. 31, 2014 Nonperforming Financing Receivable [Member] Consumer - Indirect [Member]	Dec. 31, 2013 Nonperforming Financing Receivable [Member] Consumer - Indirect [Member]	Mar. 31, 2014 Nonperforming Financing Receivable [Member] Leasing and other and overdrafts [Member]	Dec. 31, 2013 Nonperforming Financing Receivable [Member] Leasing and other and overdrafts [Member]	Mar. 31, 2014 Performing Financing Receivable [Member] Commercial Loans, Commerical Mortgages, Constructions Loans [Member]	Dec. 31, 2013 Performing Financing Receivable [Member] Commercial Loans, Commerical Mortgages, Constructions Loans [Member]	Mar. 31, 2014 Performing Financing Receivable [Member] Real-estate - home equity [Member]	Dec. 31, 2013 Performing Financing Receivable [Member] Real-estate - home equity [Member]	Mar. 31, 2014 Performing Financing Receivable [Member] Real-estate - residential mortgage [Member]	Dec. 31, 2013 Performing Financing Receivable [Member] Real-estate - residential mortgage [Member]	Mar. 31, 2014 Performing Financing Receivable [Member] Construction other [Member]	Dec. 31, 2013 Performing Financing Receivable [Member] Construction other [Member]	Mar. 31, 2014 Performing Financing Receivable [Member] Total Consumer	Dec. 31, 2013 Performing Financing Receivable [Member] Total Consumer	Mar. 31, 2014 Performing Financing Receivable [Member] Consumer - direct [Member]	Dec. 31, 2013 Performing Financing Receivable [Member] Consumer - direct [Member]	Mar. 31, 2014 Performing Financing Receivable [Member] Consumer - Indirect [Member]	Dec. 31, 2013 Performing Financing Receivable [Member] Consumer - Indirect [Member]	Mar. 31, 2014 Performing Financing Receivable [Member] Leasing and other and overdrafts [Member]	Dec. 31, 2013 Performing Financing Receivable [Member] Leasing and other and overdrafts [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Recorded Investment, Days Outstanding																										90
Loans and Leases Receivable, Net of Deferred Income	$ 12,733,792	$ 12,782,220	$ 12,377,288	$ 199,089	$ 224,257	$ 3,509,571	$ 3,547,012	$ 1,740,496	$ 1,764,197	$ 1,689,446	$ 1,331,465	$ 1,337,380	$ 1,303,454	$ 71,580	$ 68,806	$ 270,021	$ 283,124	$ 309,138	$ 123,254	$ 132,643	$ 146,767	$ 150,481	$ 96,009	$ 93,505	$ 89,240		$ 50,010	$ 51,469	$ 17,088	$ 16,983	$ 29,305	$ 31,347	$ 544	$ 548	$ 2,999	$ 2,543	$ 2,872	$ 2,391	$ 127	$ 152	$ 74	$ 48	$ 3,419,489	$ 3,448,756	$ 1,711,430	$ 1,731,185	$ 1,281,854	$ 1,282,754	$ 70,096	$ 68,258	$ 260,968	$ 273,683	$ 116,748	$ 126,666	$ 144,220	$ 147,017	$ 95,141	$ 92,876
Loans And Leases Receivable Percentage Of Loans Within Delinquecy Category By Total Non Risk Rated Loans						100.00%	100.00%																				1.40%	1.50%															97.40%	97.20%