Loans And Allowance For Loan Losses (Narrative) (Details) (USD $)	6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Loans And Allowance For Loan Losses [Abstract]
Loans pledged at the Federal Home Loan Bank as collateral for borrowings and letters of credit obtained to secure public deposits	$ 3,500,000,000
Loans pledged at the Federal Reserve Bank as collateral for discount window borrowings	1,100,000,000
Personal real estate loans excluded from table	237,400,000	244,300,000
Consumer loans excluded from table	7,100,000	47,500,000
Consumer and personal real estate loans excluded from table, as a percentage of Personal Banking portfolio	5.30%	6.50%
Troubled Debt Restructured Loans	82,300,000
Accruing Restructured Loans	61,465,000	58,822,000
Restructured Loans NonAccrual	20,800,000
Restructured loans performing under their modified terms	42,100,000
Aggregate restructured credit card loans held	11,400,000
Restructured Loans Due to Bankruptcy Proceeding	8,000,000
Period after which loans are deemed in default (in days)	90 days
Effect on Interest Income Resulting From Modification to Credit Card Loans	1,200,000
Commitments to lend additional funds to customers with restructured loans	9,500,000
Foreclosed real estate	8,400,000	6,600,000
Personal property acquired in repossession	$ 1,700,000	$ 2,800,000