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		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	$ 161,532	$ 168,032	$ 161,532	$ 172,532
Provision for loan losses	7,555	7,379	17,215	10,664
Loans charged off	12,970	14,691	26,851	27,197
Less recoveries on loans	5,415	5,312	9,636	10,033
Net loan charge-offs	7,555	9,379	17,215	17,164
Balance at end of period	161,532	166,032	161,532	166,032
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	97,881	99,821	94,189	105,725
Provision for loan losses	486	(800)	4,553	(7,390)
Loans charged off	1,218	2,261	2,348	2,966
Less recoveries on loans	1,779	1,839	2,534	3,230
Net loan charge-offs	(561)	422	(186)	(264)
Balance at end of period	98,928	98,599	98,928	98,599
Personal Banking Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	63,651	68,211	67,343	66,807
Provision for loan losses	7,069	8,179	12,662	18,054
Loans charged off	11,752	12,430	24,503	24,231
Less recoveries on loans	3,636	3,473	7,102	6,803
Net loan charge-offs	8,116	8,957	17,401	17,428
Balance at end of period	$ 62,604	$ 67,433	$ 62,604	$ 67,433