Loans And Allowance For Loan Losses (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
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	$ 3,600,000,000
Loans Pledged to the Federal Reserve Bank as collateral for discount window borrowings	1,300,000,000
Troubled Debt Restructured Loans	65,900,000
Accruing Restructured Loans	42,991,000	40,313,000
Restructured Loans NonAccrual	23,000,000
Restructured loans performing under their modified terms	24,400,000
Aggregate restructured credit card loans held	9,600,000
Restructured Loans Due to Bankruptcy Proceeding	9,000,000
Period after which loans are deemed in default (in days)	90 days
Effect on Interest Income Resulting From Modification to Credit Card Loans	(1,100,000)
Commitments to lend additional funds to customers with restructured loans	6,400,000
Fair Value of Personal Real Estate Loans Held for Sale	2,800,000
Unpaid Principal Balance on Personal Real Estate Loans Held for Sale	2,700,000
Foreclosed real estate	5,000,000	5,500,000
Personal property acquired in repossession	$ 2,200,000	$ 2,400,000