Loans And Allowance For Loan Losses (Summary Classification Of Held To Maturity Loan Portfolio) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Loans And Allowance For Loan Losses [Line Items]
Total loans	$ 13,091,888	$ 12,436,692
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	4,840,248	4,397,893
Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	819,896	624,070
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	2,399,271	2,355,544
Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	1,927,340	1,915,953
Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	1,939,486	1,924,365
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	408,301	432,981
Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	753,166	779,744
Overdrafts [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	$ 4,180	$ 6,142