Loans and Leases and the Allowance for Loan and Lease Losses (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013 D	Dec. 31, 2012	Mar. 31, 2012
Aging Analysis of Accruing and Non-Accruing Loans and Leases
30 - 59 Days Past Due	$ 26,919	$ 20,555
60 - 89 Days Past Due	16,104	21,303
Past Due 90 Days or More	11,652	10,409
Non-Accrual	35,056	33,196
Total Past Due and Non-Accrual	89,731	85,463
Current	5,693,238	5,769,058
Total Loans and Leases	5,782,969	5,854,521	5,598,932
Non-Accrual Loans and Leases that are Current	12,766	12,738
Number of days non-accrual loans and leases are not past due	30
Commercial
Aging Analysis of Accruing and Non-Accruing Loans and Leases
30 - 59 Days Past Due	2,374	994
60 - 89 Days Past Due	9,691	10,924
Past Due 90 Days or More	230	27
Non-Accrual	7,943	9,397
Total Past Due and Non-Accrual	20,238	21,342
Current	2,306,185	2,294,551
Total Loans and Leases	2,326,423	2,315,893	2,132,958
Non-Accrual Loans and Leases that are Current	6,526	7,606
Commercial and Industrial
Aging Analysis of Accruing and Non-Accruing Loans and Leases
30 - 59 Days Past Due	2,195	806
60 - 89 Days Past Due	9,691	10,382
Past Due 90 Days or More	230	27
Non-Accrual	5,033	5,534
Total Past Due and Non-Accrual	17,149	16,749
Current	817,652	812,763
Total Loans and Leases	834,801	829,512
Non-Accrual Loans and Leases that are Current	4,462	4,963
Commercial Mortgage
Aging Analysis of Accruing and Non-Accruing Loans and Leases
30 - 59 Days Past Due	179	188
60 - 89 Days Past Due	0	542
Non-Accrual	2,910	3,030
Total Past Due and Non-Accrual	3,089	3,760
Current	1,101,629	1,093,665
Total Loans and Leases	1,104,718	1,097,425
Non-Accrual Loans and Leases that are Current	2,064	1,810
Construction
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Non-Accrual	0	833
Total Past Due and Non-Accrual	0	833
Current	117,797	113,154
Total Loans and Leases	117,797	113,987
Non-Accrual Loans and Leases that are Current	0	833
Lease Financing
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Non-Accrual		0
Total Past Due and Non-Accrual		0
Current	269,107	274,969
Total Loans and Leases	269,107	274,969
Non-Accrual Loans and Leases that are Current		0
Consumer
Aging Analysis of Accruing and Non-Accruing Loans and Leases
30 - 59 Days Past Due	24,545	19,561
60 - 89 Days Past Due	6,413	10,379
Past Due 90 Days or More	11,422	10,382
Non-Accrual	27,113	23,799
Total Past Due and Non-Accrual	69,493	64,121
Current	3,387,053	3,474,507
Total Loans and Leases	3,456,546	3,538,628	3,465,974
Non-Accrual Loans and Leases that are Current	6,240	5,132
Residential Mortgage
Aging Analysis of Accruing and Non-Accruing Loans and Leases
30 - 59 Days Past Due	12,502	6,891
60 - 89 Days Past Due	2,210	5,433
Past Due 90 Days or More	5,967	6,908
Non-Accrual	24,700	21,725
Total Past Due and Non-Accrual	45,379	40,957
Current	2,229,830	2,308,959
Total Loans and Leases	2,275,209	2,349,916
Non-Accrual Loans and Leases that are Current	5,909	4,941
Home Equity
Aging Analysis of Accruing and Non-Accruing Loans and Leases
30 - 59 Days Past Due	6,398	6,768
60 - 89 Days Past Due	2,697	3,267
Past Due 90 Days or More	4,538	2,701
Non-Accrual	2,413	2,074
Total Past Due and Non-Accrual	16,046	14,810
Current	741,831	755,566
Total Loans and Leases	757,877	770,376
Non-Accrual Loans and Leases that are Current	331	191
Automobile
Aging Analysis of Accruing and Non-Accruing Loans and Leases
30 - 59 Days Past Due	3,162	3,758
60 - 89 Days Past Due	335	586
Past Due 90 Days or More	241	186
Total Past Due and Non-Accrual	3,738	4,530
Current	216,624	205,302
Total Loans and Leases	220,362	209,832
Other
Aging Analysis of Accruing and Non-Accruing Loans and Leases
30 - 59 Days Past Due	2,483	2,144
60 - 89 Days Past Due	1,171	1,093
Past Due 90 Days or More	676	587
Total Past Due and Non-Accrual	4,330	3,824
Current	198,768	204,680
Total Loans and Leases	$ 203,098	$ 208,504