Loans (Summary Of Loan Portfolio) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011
Loans [Line Items]
Loans, net of unearned income, excluding covered loans	$ 10,717,384	$ 10,521,377	$ 9,561,802
Covered loans	691,220	651,368	431,299
Total loans	11,408,604	11,172,745	9,993,101
Loans, net of unearned income, excluding covered loans, percentage	94.00%	94.00%	96.00%
Covered loans, percentage	6.00%	6.00%	4.00%
Total loans, percentage	100.00%	100.00%	100.00%
Commercial Loan [Member]
Loans [Line Items]
Loans, net of unearned income, excluding covered loans	2,544,456	2,498,313	1,937,561
Loans, net of unearned income, excluding covered loans, percentage	22.00%	22.00%	19.00%
Commercial Real-Estate Loans [Member]
Loans [Line Items]
Loans, net of unearned income, excluding covered loans	3,585,760	3,514,261	3,356,562
Loans, net of unearned income, excluding covered loans, percentage	32.00%	31.00%	34.00%
Home Equity [Member]
Loans [Line Items]
Loans, net of unearned income, excluding covered loans	840,364	862,345	891,332
Loans, net of unearned income, excluding covered loans, percentage	7.00%	8.00%	9.00%
Residential Real-Estate [Member]
Loans [Line Items]
Loans, net of unearned income, excluding covered loans	361,327	350,289	344,909
Loans, net of unearned income, excluding covered loans, percentage	3.00%	3.00%	4.00%
Premium Finance Receivables - Commercial [Member]
Loans [Line Items]
Loans, net of unearned income, excluding covered loans	1,512,630	1,412,454	1,337,851
Loans, net of unearned income, excluding covered loans, percentage	13.00%	13.00%	13.00%
Premium Finance Receivables - Life Insurance [Member]
Loans [Line Items]
Loans, net of unearned income, excluding covered loans	1,693,763	1,695,225	1,539,521
Loans, net of unearned income, excluding covered loans, percentage	15.00%	15.00%	15.00%
Indirect Consumer [Member]
Loans [Line Items]
Loans, net of unearned income, excluding covered loans	67,445	64,545	52,379
Loans, net of unearned income, excluding covered loans, percentage	1.00%	1.00%	1.00%
Consumer And Other [Member]
Loans [Line Items]
Loans, net of unearned income, excluding covered loans	$ 111,639	$ 123,945	$ 101,687
Loans, net of unearned income, excluding covered loans, percentage	1.00%	1.00%	1.00%