Loans and Leases and the Allowance for Loan and Lease Losses (Details 4) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2011 month contract day security	Dec. 31, 2010
Aging Analysis of Accruing and Non-Accruing Loans and Leases
30 - 59 Days Past Due	$ 24,205	$ 24,634
60 - 89 Days Past Due	13,736	14,955
Past Due 90 Days or More	10,855	7,583
Non-Accrual	34,429	35,858
Total Past Due and Non-Accrual	83,225	83,030
Current	5,265,247	5,252,762
Total Loans and Leases	5,348,472	5,335,792
Non-Accrual Loans and Leases that are Current	11,373	12,930
Number of days nonaccrual loans and leases are not past due (in days)	30
Commercial
Aging Analysis of Accruing and Non-Accruing Loans and Leases
30 - 59 Days Past Due	1,072	3,989
60 - 89 Days Past Due	761	1,341
Non-Accrual	8,787	5,452
Total Past Due and Non-Accrual	10,620	10,782
Current	2,083,543	2,040,549
Total Loans and Leases	2,094,163	2,051,331
Non-Accrual Loans and Leases that are Current	7,149	3,998
Commercial and Industrial
Aging Analysis of Accruing and Non-Accruing Loans and Leases
30 - 59 Days Past Due	956	1,807
60 - 89 Days Past Due	761	1,341
Non-Accrual	6,593	1,642
Total Past Due and Non-Accrual	8,310	4,790
Current	781,984	767,834
Total Loans and Leases	790,294	772,624
Non-Accrual Loans and Leases that are Current	5,912	1,564
Commercial Mortgage
Aging Analysis of Accruing and Non-Accruing Loans and Leases
30 - 59 Days Past Due	103	2,100
Non-Accrual	2,188	3,503
Total Past Due and Non-Accrual	2,291	5,603
Current	919,784	857,782
Total Loans and Leases	922,075	863,385
Non-Accrual Loans and Leases that are Current	1,231	2,415
Construction
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Non-Accrual		288
Total Past Due and Non-Accrual		288
Current	69,635	80,037
Total Loans and Leases	69,635	80,325
Lease Financing
Aging Analysis of Accruing and Non-Accruing Loans and Leases
30 - 59 Days Past Due	13	82
Non-Accrual	6	19
Total Past Due and Non-Accrual	19	101
Current	312,140	334,896
Total Loans and Leases	312,159	334,997
Non-Accrual Loans and Leases that are Current	6	19
Consumer
Aging Analysis of Accruing and Non-Accruing Loans and Leases
30 - 59 Days Past Due	23,133	20,645
60 - 89 Days Past Due	12,975	13,614
Past Due 90 Days or More	10,855	7,583
Non-Accrual	25,642	30,406
Total Past Due and Non-Accrual	72,605	72,248
Current	3,181,704	3,212,213
Total Loans and Leases	3,254,309	3,284,461
Non-Accrual Loans and Leases that are Current	4,224	8,932
Residential Mortgage
Aging Analysis of Accruing and Non-Accruing Loans and Leases
30 - 59 Days Past Due	11,735	8,389
60 - 89 Days Past Due	9,667	9,045
Past Due 90 Days or More	7,664	5,399
Non-Accrual	23,779	28,152
Total Past Due and Non-Accrual	52,845	50,985
Current	2,077,744	2,043,204
Total Loans and Leases	2,130,589	2,094,189
Non-Accrual Loans and Leases that are Current	3,940	7,891
Home Equity
Aging Analysis of Accruing and Non-Accruing Loans and Leases
30 - 59 Days Past Due	6,422	4,248
60 - 89 Days Past Due	1,545	2,420
Past Due 90 Days or More	2,639	1,067
Non-Accrual	1,863	2,254
Total Past Due and Non-Accrual	12,469	9,989
Current	762,636	797,490
Total Loans and Leases	775,105	807,479
Non-Accrual Loans and Leases that are Current	284	1,041
Automobile
Aging Analysis of Accruing and Non-Accruing Loans and Leases
30 - 59 Days Past Due	3,640	6,046
60 - 89 Days Past Due	714	1,004
Past Due 90 Days or More	138	410
Total Past Due and Non-Accrual	4,492	7,460
Current	187,005	201,548
Total Loans and Leases	191,497	209,008
Other Consumer
Aging Analysis of Accruing and Non-Accruing Loans and Leases
30 - 59 Days Past Due	1,336	1,962
60 - 89 Days Past Due	1,049	1,145
Past Due 90 Days or More	414	707
Total Past Due and Non-Accrual	2,799	3,814
Current	154,319	169,971
Total Loans and Leases	$ 157,118	$ 173,785