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, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	$ 161,532	$ 172,532	$ 184,532
Provision for Loan, Lease, and Other Losses	29,531	20,353	27,287
Loans charged off	52,773	54,199	63,161
Less recoveries	18,242	22,846	23,874
Allowance for Loan and Lease Losses Write-offs, Net	34,531	31,353	39,287
Balance at end of period	156,532	161,532	172,532
Commercial Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	94,189	105,725	122,497
Provision for Loan, Lease, and Other Losses	(5,204)	(16,143)	(14,444)
Loans charged off	4,548	5,170	11,094
Less recoveries	5,185	9,777	8,766
Allowance for Loan and Lease Losses Write-offs, Net	(637)	(4,607)	2,328
Balance at end of period	89,622	94,189	105,725
Personal Banking Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	67,343	66,807	62,035
Provision for Loan, Lease, and Other Losses	34,735	36,496	41,731
Loans charged off	48,225	49,029	52,067
Less recoveries	13,057	13,069	15,108
Allowance for Loan and Lease Losses Write-offs, Net	35,168	35,960	36,959
Balance at end of period	$ 66,910	$ 67,343	$ 66,807