Loans And Allowance For Loan Losses (Summary Of Loans, Net Of Unearned Income) (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial loans and leases	$ 4,235,429	$ 3,970,214
Loans, net of unearned income	7,860,856	6,856,667
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial loans and leases	2,532,116	2,341,646
Loans, net of unearned income	2,532,116	2,341,646
Commercial Real Estate - FL [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial loans and leases	84,642	154,081
Loans, net of unearned income	84,642	154,081
Commercial And Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial loans and leases	1,493,378	1,363,692
Loans, net of unearned income	1,493,378	1,363,692
Commercial Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial loans and leases	125,293	110,795
Loans, net of unearned income	125,293	110,795
Direct Installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	1,109,676	1,029,187
Residential Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	1,158,377	670,936
Indirect Installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	577,903	540,789
Consumer Lines Of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	741,509	607,280
Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	$ 37,962	$ 38,261