Loans (Loan Portfolio By Category) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2010
Loans, net of unearned income, excluding covered loans, balance	$ 9,925,077	$ 9,599,886	$ 9,324,163
Covered loans, balance	408,669	334,353	275,563
Total loans, balance	10,333,746	9,934,239	9,599,726
Loans, net of unearned income, excluding covered loans, mix	96.00%	97.00%	97.00%
Covered loans, mix	4.00%	3.00%	3.00%
Total loans, mix	100.00%	100.00%	100.00%
Commercial Loans [Member]
Loans, net of unearned income, excluding covered loans, balance	2,132,436	2,049,326	1,827,618
Total loans, balance	2,132,436	2,049,326	1,827,618
Loans, net of unearned income, excluding covered loans, mix	20.00%	21.00%	19.00%
Commercial Real-Estate Loans [Member]
Loans, net of unearned income, excluding covered loans, balance	3,374,668	3,338,007	3,347,823
Total loans, balance	3,374,668	3,338,007	3,347,823
Loans, net of unearned income, excluding covered loans, mix	33.00%	34.00%	35.00%
Home Equity [Member]
Loans, net of unearned income, excluding covered loans, balance	880,702	914,412	922,305
Total loans, balance	880,702	914,412	922,305
Loans, net of unearned income, excluding covered loans, mix	8.00%	9.00%	10.00%
Residential Real Estate [Member]
Loans, net of unearned income, excluding covered loans, balance	329,381	353,336	332,673
Total loans, balance	329,381	353,336	332,673
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	1,429,436	1,265,500	1,346,985
Loans, net of unearned income, excluding covered loans, mix	14.00%	13.00%	14.00%
Premium Finance Receivables - Life Insurance [Member]
Loans, net of unearned income, excluding covered loans, balance	1,619,668	1,521,886	1,378,657
Loans, net of unearned income, excluding covered loans, mix	16.00%	15.00%	14.00%
Indirect Consumer [Member]
Loans, net of unearned income, excluding covered loans, balance	57,718	51,147	69,011
Total loans, balance	57,718	51,147	69,011
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	101,068	106,272	99,091
Total loans, balance	$ 101,068	$ 106,272	$ 99,091
Loans, net of unearned income, excluding covered loans, mix	1.00%	1.00%	1.00%