Loans and Allowance for Credit Losses Summary of Delinquency and Non-Performing Status by Portfolio Segment (Details) (USD $) In Thousands, unless otherwise specified																										6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Jun. 30, 2014 Commercial - Unsecured [Member]	Dec. 31, 2013 Commercial - Unsecured [Member]	Jun. 30, 2014 Commercial Loans, Commerical Mortgages, Constructions Loans [Member]	Dec. 31, 2013 Commercial Loans, Commerical Mortgages, Constructions Loans [Member]	Jun. 30, 2014 Real-estate - home equity [Member]	Dec. 31, 2013 Real-estate - home equity [Member]	Jun. 30, 2013 Real-estate - home equity [Member]	Jun. 30, 2014 Real-estate - residential mortgage [Member]	Dec. 31, 2013 Real-estate - residential mortgage [Member]	Jun. 30, 2013 Real-estate - residential mortgage [Member]	Jun. 30, 2014 Construction other [Member]	Dec. 31, 2013 Construction other [Member]	Jun. 30, 2014 Total Consumer	Dec. 31, 2013 Total Consumer	Jun. 30, 2013 Total Consumer	Jun. 30, 2014 Consumer - direct [Member]	Dec. 31, 2013 Consumer - direct [Member]	Jun. 30, 2014 Consumer - Indirect [Member]	Dec. 31, 2013 Consumer - Indirect [Member]	Jun. 30, 2014 Leasing and other and overdrafts [Member]	Dec. 31, 2013 Leasing and other and overdrafts [Member]	Jun. 30, 2013 Leasing and other and overdrafts [Member]	Jun. 30, 2014 Nonperforming Financing Receivable [Member]	Jun. 30, 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]	Jun. 30, 2014 Nonperforming Financing Receivable [Member] Real-estate - home equity [Member]	Dec. 31, 2013 Nonperforming Financing Receivable [Member] Real-estate - home equity [Member]	Jun. 30, 2014 Nonperforming Financing Receivable [Member] Real-estate - residential mortgage [Member]	Dec. 31, 2013 Nonperforming Financing Receivable [Member] Real-estate - residential mortgage [Member]	Jun. 30, 2014 Nonperforming Financing Receivable [Member] Construction other [Member]	Dec. 31, 2013 Nonperforming Financing Receivable [Member] Construction other [Member]	Jun. 30, 2014 Nonperforming Financing Receivable [Member] Total Consumer	Dec. 31, 2013 Nonperforming Financing Receivable [Member] Total Consumer	Jun. 30, 2014 Nonperforming Financing Receivable [Member] Consumer - direct [Member]	Dec. 31, 2013 Nonperforming Financing Receivable [Member] Consumer - direct [Member]	Jun. 30, 2014 Nonperforming Financing Receivable [Member] Consumer - Indirect [Member]	Dec. 31, 2013 Nonperforming Financing Receivable [Member] Consumer - Indirect [Member]	Jun. 30, 2014 Nonperforming Financing Receivable [Member] Leasing and other and overdrafts [Member]	Dec. 31, 2013 Nonperforming Financing Receivable [Member] Leasing and other and overdrafts [Member]	Jun. 30, 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]	Jun. 30, 2014 Performing Financing Receivable [Member] Real-estate - home equity [Member]	Dec. 31, 2013 Performing Financing Receivable [Member] Real-estate - home equity [Member]	Jun. 30, 2014 Performing Financing Receivable [Member] Real-estate - residential mortgage [Member]	Dec. 31, 2013 Performing Financing Receivable [Member] Real-estate - residential mortgage [Member]	Jun. 30, 2014 Performing Financing Receivable [Member] Construction other [Member]	Dec. 31, 2013 Performing Financing Receivable [Member] Construction other [Member]	Jun. 30, 2014 Performing Financing Receivable [Member] Total Consumer	Dec. 31, 2013 Performing Financing Receivable [Member] Total Consumer	Jun. 30, 2014 Performing Financing Receivable [Member] Consumer - direct [Member]	Dec. 31, 2013 Performing Financing Receivable [Member] Consumer - direct [Member]	Jun. 30, 2014 Performing Financing Receivable [Member] Consumer - Indirect [Member]	Dec. 31, 2013 Performing Financing Receivable [Member] Consumer - Indirect [Member]	Jun. 30, 2014 Performing Financing Receivable [Member] Leasing and other and overdrafts [Member]	Dec. 31, 2013 Performing Financing Receivable [Member] Leasing and other and overdrafts [Member]	Jun. 30, 2014 Delinquent [Member] Commercial Loans, Commerical Mortgages, Constructions Loans [Member]	Dec. 31, 2013 Delinquent [Member] Commercial Loans, Commerical Mortgages, Constructions Loans [Member]	Jun. 30, 2014 Delinquent [Member] Real-estate - home equity [Member]	Dec. 31, 2013 Delinquent [Member] Real-estate - home equity [Member]	Jun. 30, 2014 Delinquent [Member] Real-estate - residential mortgage [Member]	Dec. 31, 2013 Delinquent [Member] Real-estate - residential mortgage [Member]	Jun. 30, 2014 Delinquent [Member] Construction other [Member]	Dec. 31, 2013 Delinquent [Member] Construction other [Member]	Jun. 30, 2014 Delinquent [Member] Total Consumer	Dec. 31, 2013 Delinquent [Member] Total Consumer	Jun. 30, 2014 Delinquent [Member] Consumer - direct [Member]	Dec. 31, 2013 Delinquent [Member] Consumer - direct [Member]	Jun. 30, 2014 Delinquent [Member] Consumer - Indirect [Member]	Dec. 31, 2013 Delinquent [Member] Consumer - Indirect [Member]	Jun. 30, 2014 Delinquent [Member] Leasing and other and overdrafts [Member]	Dec. 31, 2013 Delinquent [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	$ 12,839,511	$ 12,782,220	$ 12,645,418	$ 201,007	$ 224,257	$ 3,544,052	$ 3,547,012	$ 1,730,497	$ 1,764,197	$ 1,760,268	$ 1,361,976	$ 1,337,380	$ 1,313,345	$ 69,014	$ 68,806	$ 280,557	$ 283,124	$ 300,233	$ 129,572	$ 132,643	$ 150,985	$ 150,481	$ 102,008	$ 93,505	$ 91,402		$ 47,147	$ 51,469	$ 16,094	$ 16,983	$ 27,887	$ 31,347	$ 281	$ 548	$ 2,825	$ 2,543	$ 2,765	$ 2,391	$ 60	$ 152	$ 60	$ 48	$ 3,454,690	$ 3,448,756	$ 1,702,554	$ 1,731,185	$ 1,309,813	$ 1,282,754	$ 68,584	$ 68,258	$ 272,324	$ 273,683	$ 123,483	$ 126,666	$ 148,841	$ 147,017	$ 101,415	$ 92,876	$ 42,215	$ 46,787	$ 11,849	$ 16,029	$ 24,276	$ 23,279	$ 149	$ 0	$ 5,408	$ 6,898	$ 3,324	$ 3,586	$ 2,084	$ 3,312	$ 533	$ 581
Loans And Leases Receivable Percentage Of Loans Within Delinquecy Category By Total Non Risk Rated Loans						100.00%	100.00%																				1.30%	1.50%															97.50%	97.20%															1.20%	1.30%