Loans and Leases and the Allowance for Loan and Lease Losses (Details 3) (USD $) In Thousands, unless otherwise specified																																																																																						12 Months Ended											12 Months Ended		12 Months Ended		12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2007	Dec. 31, 2011 Commercial	Dec. 31, 2010 Commercial	Dec. 31, 2009 Commercial	Dec. 31, 2008 Commercial	Dec. 31, 2007 Commercial	Dec. 31, 2011 Commercial and Industrial	Dec. 31, 2010 Commercial and Industrial	Dec. 31, 2009 Commercial and Industrial	Dec. 31, 2008 Commercial and Industrial	Dec. 31, 2007 Commercial and Industrial	Dec. 31, 2011 Commercial Mortgage	Dec. 31, 2010 Commercial Mortgage	Dec. 31, 2009 Commercial Mortgage	Dec. 31, 2008 Commercial Mortgage	Dec. 31, 2007 Commercial Mortgage	Dec. 31, 2011 Construction	Dec. 31, 2010 Construction	Dec. 31, 2009 Construction	Dec. 31, 2008 Construction	Dec. 31, 2007 Construction	Dec. 31, 2011 Lease Financing	Dec. 31, 2010 Lease Financing	Dec. 31, 2009 Lease Financing	Dec. 31, 2008 Lease Financing	Dec. 31, 2007 Lease Financing	Dec. 31, 2011 Consumer	Dec. 31, 2010 Consumer	Dec. 31, 2009 Consumer	Dec. 31, 2008 Consumer	Dec. 31, 2007 Consumer	Dec. 31, 2011 Residential Mortgage	Dec. 31, 2010 Residential Mortgage	Dec. 31, 2009 Residential Mortgage	Dec. 31, 2008 Residential Mortgage	Dec. 31, 2007 Residential Mortgage	Dec. 31, 2011 Home Equity	Dec. 31, 2010 Home Equity	Dec. 31, 2009 Home Equity	Dec. 31, 2008 Home Equity	Dec. 31, 2007 Home Equity	Dec. 31, 2011 Automobile	Dec. 31, 2010 Automobile	Dec. 31, 2009 Automobile	Dec. 31, 2008 Automobile	Dec. 31, 2007 Automobile	Dec. 31, 2011 Other Consumer	Dec. 31, 2010 Other Consumer	Dec. 31, 2009 Other Consumer	Dec. 31, 2008 Other Consumer	Dec. 31, 2007 Other Consumer	Dec. 31, 2011 Pass Commercial	Dec. 31, 2010 Pass Commercial	Dec. 31, 2011 Pass Commercial and Industrial	Dec. 31, 2010 Pass Commercial and Industrial	Dec. 31, 2011 Pass Commercial Mortgage	Dec. 31, 2010 Pass Commercial Mortgage	Dec. 31, 2011 Pass Construction	Dec. 31, 2010 Pass Construction	Dec. 31, 2011 Pass Lease Financing	Dec. 31, 2010 Pass Lease Financing	Dec. 31, 2011 Pass Consumer	Dec. 31, 2010 Pass Consumer	Dec. 31, 2011 Pass Residential Mortgage	Dec. 31, 2010 Pass Residential Mortgage	Dec. 31, 2011 Pass Home Equity	Dec. 31, 2010 Pass Home Equity	Dec. 31, 2011 Pass Automobile	Dec. 31, 2010 Pass Automobile	Dec. 31, 2011 Pass Other Consumer	Dec. 31, 2010 Pass Other Consumer	Dec. 31, 2011 Special Mention Commercial	Dec. 31, 2010 Special Mention Commercial	Dec. 31, 2011 Special Mention Commercial and Industrial	Dec. 31, 2010 Special Mention Commercial and Industrial	Dec. 31, 2011 Special Mention Commercial Mortgage	Dec. 31, 2010 Special Mention Commercial Mortgage	Dec. 31, 2011 Special Mention Construction	Dec. 31, 2010 Special Mention Construction	Dec. 31, 2011 Special Mention Lease Financing	Dec. 31, 2010 Special Mention Lease Financing	Dec. 31, 2011 Classified M	Dec. 31, 2011 Classified Commercial	Dec. 31, 2010 Classified Commercial	Dec. 31, 2011 Classified Commercial and Industrial	Dec. 31, 2010 Classified Commercial and Industrial	Dec. 31, 2011 Classified Commercial Mortgage	Dec. 31, 2010 Classified Commercial Mortgage	Dec. 31, 2011 Classified Construction	Dec. 31, 2010 Classified Construction	Dec. 31, 2011 Classified Lease Financing	Dec. 31, 2010 Classified Lease Financing	Dec. 31, 2011 Classified Consumer D	Dec. 31, 2010 Classified Consumer	Dec. 31, 2011 Classified Residential Mortgage D	Dec. 31, 2010 Classified Residential Mortgage	Dec. 31, 2011 Classified Home Equity D	Dec. 31, 2010 Classified Home Equity	Dec. 31, 2011 Classified Automobile	Dec. 31, 2010 Classified Automobile	Dec. 31, 2011 Classified Other Consumer	Dec. 31, 2010 Classified Other Consumer
Recorded investment in loans and leases by class and by credit quality indicator
Number of days past due for loans and leases in classified credit quality indicator																																																																																																	90		90		90
Maximum current loan-to-value ratio for residential mortgage and home equity loans to be considered as pass (as a percent)																																																																																																			60.00%		60.00%
Number of months up to which residential and home equity loans may be considered classified, even if they are current as to principal and interest (in months)																																																																																						6
Total Recorded Investment in Loans and Leases	$ 5,538,304	$ 5,335,792	$ 5,759,785	$ 6,530,233	$ 6,580,861	$ 2,166,017	$ 2,051,331	$ 2,157,926	$ 2,416,652	$ 2,379,390	$ 817,170	$ 772,624	$ 795,167	$ 1,053,781	$ 1,054,355	$ 938,250	$ 863,385	$ 841,431	$ 740,779	$ 634,483	$ 98,669	$ 80,325	$ 108,395	$ 153,952	$ 208,670	$ 311,928	$ 334,997	$ 412,933	$ 468,140	$ 481,882	$ 3,372,287	$ 3,284,461	$ 3,601,859	$ 4,113,581	$ 4,201,471	$ 2,215,892	$ 2,094,189	$ 2,190,677	$ 2,461,824	$ 2,486,284	$ 780,691	$ 807,479	$ 921,571	$ 1,033,221	$ 994,972	$ 192,506	$ 209,008	$ 283,937	$ 369,789	$ 443,011	$ 183,198	$ 173,785	$ 205,674	$ 248,747	$ 277,204	$ 1,991,033	$ 1,864,121	$ 765,339	$ 720,618	$ 859,891	$ 775,938	$ 83,722	$ 61,598	$ 282,081	$ 305,967	$ 3,337,303	$ 3,244,530	$ 2,186,063	$ 2,059,012	$ 776,473	$ 804,158	$ 192,336	$ 208,598	$ 182,431	$ 172,762	$ 100,748	$ 78,893	$ 30,316	$ 18,096	$ 43,805	$ 32,055	$ 370	$ 1,975	$ 26,257	$ 26,767		$ 74,236	$ 108,317	$ 21,515	$ 33,910	$ 34,554	$ 55,392	$ 14,577	$ 16,752	$ 3,590	$ 2,263	$ 34,984	$ 39,931	$ 29,829	$ 35,177	$ 4,218	$ 3,321	$ 170	$ 410	$ 767	$ 1,023