Loans And Allowance For Loan Losses (Summary Of Activity In The Allowance For Loan Losses) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	$ 166,032	$ 178,533	$ 172,532	$ 184,532
Provision	4,146	5,581	14,810	18,961
Loans charged off	13,087	14,275	40,284	47,212
Less recoveries on loans	6,441	5,193	16,474	18,751
Net loans charged off	6,646	9,082	23,810	28,461
Balance at end of period	163,532	175,032	163,532	175,032
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	98,599	114,671	105,725	122,497
Provision	(2,885)	(2,479)	(10,275)	(10,125)
Loans charged off	913	1,795	3,879	7,502
Less recoveries on loans	3,144	1,720	6,374	7,247
Net loans charged off	(2,231)	75	(2,495)	255
Balance at end of period	97,945	112,117	97,945	112,117
Personal Banking Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	67,433	63,862	66,807	62,035
Provision	7,031	8,060	25,085	29,086
Loans charged off	12,174	12,480	36,405	39,710
Less recoveries on loans	3,297	3,473	10,100	11,504
Net loans charged off	8,877	9,007	26,305	28,206
Balance at end of period	$ 65,587	$ 62,915	$ 65,587	$ 62,915