Loans And Allowance For Loan Losses (Summary Of Activity In The Allowance For Loan Losses) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	$ 184,532	$ 197,538	$ 194,480
Provision for loan losses	27,287	51,515	100,000
Loans charged off	63,161	81,385	114,573
Less recoveries	23,874	16,864	17,631
Net loans charged off	39,287	64,521	96,942
Balance at end of period	172,532	184,532	197,538
Commercial [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	122,497	119,946
Provision for loan losses	(14,444)	18,052
Loans charged off	11,094	18,818
Less recoveries	8,766	3,317
Net loans charged off	2,328	15,501
Balance at end of period	105,725	122,497
Personal Banking [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	62,035	77,592
Provision for loan losses	41,731	33,463
Loans charged off	52,067	62,567
Less recoveries	15,108	13,547
Net loans charged off	36,959	49,020
Balance at end of period	$ 66,807	$ 62,035