Loans and Leases and the Allowance for Loan and Lease Losses (Details 3) (USD $) In Thousands, unless otherwise specified																																																								9 Months Ended											9 Months Ended		9 Months Ended		9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Sep. 30, 2012 Commercial	Dec. 31, 2011 Commercial	Sep. 30, 2011 Commercial	Sep. 30, 2012 Commercial and Industrial	Dec. 31, 2011 Commercial and Industrial	Sep. 30, 2012 Commercial Mortgage	Dec. 31, 2011 Commercial Mortgage	Sep. 30, 2012 Construction	Dec. 31, 2011 Construction	Sep. 30, 2012 Lease Financing	Dec. 31, 2011 Lease Financing	Sep. 30, 2012 Consumer	Dec. 31, 2011 Consumer	Sep. 30, 2011 Consumer	Sep. 30, 2012 Residential Mortgage	Dec. 31, 2011 Residential Mortgage	Sep. 30, 2012 Home Equity	Dec. 31, 2011 Home Equity	Sep. 30, 2012 Automobile	Dec. 31, 2011 Automobile	Sep. 30, 2012 Other Consumer	Dec. 31, 2011 Other Consumer	Sep. 30, 2012 Pass Commercial	Dec. 31, 2011 Pass Commercial	Sep. 30, 2012 Pass Commercial and Industrial	Dec. 31, 2011 Pass Commercial and Industrial	Sep. 30, 2012 Pass Commercial Mortgage	Dec. 31, 2011 Pass Commercial Mortgage	Sep. 30, 2012 Pass Construction	Dec. 31, 2011 Pass Construction	Sep. 30, 2012 Pass Lease Financing	Dec. 31, 2011 Pass Lease Financing	Sep. 30, 2012 Pass Consumer	Dec. 31, 2011 Pass Consumer	Sep. 30, 2012 Pass Residential Mortgage	Dec. 31, 2011 Pass Residential Mortgage	Sep. 30, 2012 Pass Home Equity	Dec. 31, 2011 Pass Home Equity	Sep. 30, 2012 Pass Automobile	Dec. 31, 2011 Pass Automobile	Sep. 30, 2012 Pass Other Consumer	Dec. 31, 2011 Pass Other Consumer	Sep. 30, 2012 Special Mention Commercial	Dec. 31, 2011 Special Mention Commercial	Sep. 30, 2012 Special Mention Commercial and Industrial	Dec. 31, 2011 Special Mention Commercial and Industrial	Sep. 30, 2012 Special Mention Commercial Mortgage	Dec. 31, 2011 Special Mention Commercial Mortgage	Sep. 30, 2012 Special Mention Construction	Dec. 31, 2011 Special Mention Construction	Sep. 30, 2012 Special Mention Lease Financing	Dec. 31, 2011 Special Mention Lease Financing	Sep. 30, 2012 Classified M	Sep. 30, 2012 Classified Commercial	Dec. 31, 2011 Classified Commercial	Sep. 30, 2012 Classified Commercial and Industrial	Dec. 31, 2011 Classified Commercial and Industrial	Sep. 30, 2012 Classified Commercial Mortgage	Dec. 31, 2011 Classified Commercial Mortgage	Sep. 30, 2012 Classified Construction	Dec. 31, 2011 Classified Construction	Sep. 30, 2012 Classified Lease Financing	Dec. 31, 2011 Classified Lease Financing	Sep. 30, 2012 Classified Consumer D	Dec. 31, 2011 Classified Consumer	Sep. 30, 2012 Classified Residential Mortgage D	Dec. 31, 2011 Classified Residential Mortgage	Sep. 30, 2012 Classified Home Equity D	Dec. 31, 2011 Classified Home Equity	Sep. 30, 2012 Classified Automobile	Dec. 31, 2011 Classified Automobile	Sep. 30, 2012 Classified Other Consumer	Dec. 31, 2011 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																																																								6
Total Recorded Investment in Loans and Leases	$ 5,782,304	$ 5,538,304	$ 5,348,472	$ 2,227,323	$ 2,166,017	$ 2,094,163	$ 808,621	$ 817,170	$ 1,039,556	$ 938,250	$ 101,818	$ 98,669	$ 277,328	$ 311,928	$ 3,554,981	$ 3,372,287	$ 3,254,309	$ 2,392,871	$ 2,215,892	$ 770,284	$ 780,691	$ 200,788	$ 192,506	$ 191,038	$ 183,198	$ 2,045,054	$ 1,991,033	$ 752,688	$ 765,339	$ 956,582	$ 859,891	$ 86,050	$ 83,722	$ 249,734	$ 282,081	$ 3,524,908	$ 3,337,303	$ 2,367,353	$ 2,186,063	$ 766,462	$ 776,473	$ 200,634	$ 192,336	$ 190,459	$ 182,431	$ 92,457	$ 100,748	$ 23,640	$ 30,316	$ 30,851	$ 43,805	$ 11,684	$ 370	$ 26,282	$ 26,257		$ 89,812	$ 74,236	$ 32,293	$ 21,515	$ 52,123	$ 34,554	$ 4,084	$ 14,577	$ 1,312	$ 3,590	$ 30,073	$ 34,984	$ 25,518	$ 29,829	$ 3,822	$ 4,218	$ 154	$ 170	$ 579	$ 767