Loans (Loan Portfolio By Category) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2010
Loans, net of unearned income, excluding covered loans, balance	$ 10,272,711	$ 9,599,886	$ 9,461,155
Covered loans, balance	680,075	334,353	353,840
Total loans	10,952,786	9,934,239	9,814,995
Loans, net of unearned income, excluding covered loans, mix	94.00%	97.00%	96.00%
Covered loans, mix	6.00%	3.00%	4.00%
Total loans, mix	100.00%	100.00%	100.00%
Commercial Loans [Member]
Loans, net of unearned income, excluding covered loans, balance	2,337,098	2,049,326	1,952,791
Loans, net of unearned income, excluding covered loans, mix	21.00%	21.00%	20.00%
Commercial Real-Estate Loans [Member]
Loans, net of unearned income, excluding covered loans, balance	3,465,321	3,338,007	3,331,498
Loans, net of unearned income, excluding covered loans, mix	32.00%	34.00%	34.00%
Home Equity [Member]
Loans, net of unearned income, excluding covered loans, balance	879,180	914,412	919,824
Loans, net of unearned income, excluding covered loans, mix	8.00%	9.00%	9.00%
Residential Real-Estate [Member]
Loans, net of unearned income, excluding covered loans, balance	326,207	353,336	342,009
Loans, net of unearned income, excluding covered loans, mix	3.00%	3.00%	3.00%
Premium Finance Receivables - Commercial [Member]
Loans, net of unearned income, excluding covered loans, balance	1,417,572	1,265,500	1,323,934
Loans, net of unearned income, excluding covered loans, mix	13.00%	13.00%	13.00%
Premium Finance Receivables - Life Insurance [Member]
Loans, net of unearned income, excluding covered loans, balance	1,671,443	1,521,886	1,434,994
Loans, net of unearned income, excluding covered loans, mix	15.00%	15.00%	15.00%
Indirect Consumer [Member]
Loans, net of unearned income, excluding covered loans, balance	62,452	51,147	56,575
Loans, net of unearned income, excluding covered loans, mix	1.00%	1.00%	1.00%
Consumer And Other [Member]
Loans, net of unearned income, excluding covered loans, balance	$ 113,438	$ 106,272	$ 99,530
Loans, net of unearned income, excluding covered loans, mix	1.00%	1.00%	1.00%