Loans And Allowance For Loan Losses (Summary Classification Of Held To Maturity Loan Portfolio) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Loans And Allowance For Loan Losses [Line Items]
Total loans	$ 11,222,038	$ 10,956,836
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	3,941,394	3,715,319
Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	423,667	406,197
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	2,315,167	2,313,550
Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	1,782,831	1,787,626
Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	1,561,973	1,512,716
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	419,376	420,589
Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	775,044	796,228
Overdrafts [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	2,586	4,611
Commercial Portfolio Segment [Member] | Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	3,941,394	3,715,319
Commercial Portfolio Segment [Member] | Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	423,667	406,197
Commercial Portfolio Segment [Member] | Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	2,315,167	2,313,550
Personal Banking Portfolio Segment [Member] | Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	1,782,831	1,787,626
Personal Banking Portfolio Segment [Member] | Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	1,561,973	1,512,716
Personal Banking Portfolio Segment [Member] | Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	419,376	420,589
Personal Banking Portfolio Segment [Member] | Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	775,044	796,228
Personal Banking Portfolio Segment [Member] | Overdrafts [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	$ 2,586	$ 4,611