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
	Mar. 31, 2014	Mar. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	$ 161,532	$ 172,532
Provision for loan losses	9,660	3,285
Loans charged off	13,881	12,506
Less recoveries on loans	4,221	4,721
Net loan charge-offs	9,660	7,785
Balance at end of period	161,532	168,032
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	94,189	105,725
Provision for loan losses	4,067	(6,590)
Loans charged off	1,130	705
Less recoveries on loans	755	1,391
Net loan charge-offs	375	(686)
Balance at end of period	97,881	99,821
Personal Banking Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	67,343	66,807
Provision for loan losses	5,593	9,875
Loans charged off	12,751	11,801
Less recoveries on loans	3,466	3,330
Net loan charge-offs	9,285	8,471
Balance at end of period	$ 63,651	$ 68,211