Loans and Leases (Schedule Of Troubled Debt Restructurings Balance And Activity) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				12 Months Ended
	Mar. 31, 2013		Mar. 31, 2012		Dec. 31, 2012
Troubled Debt Restructurings Balance And Activity [Line Items]
Performing TDRs, end of period	$ 65,773				$ 67,775
TDRs [Member]
Troubled Debt Restructurings Balance And Activity [Line Items]
Performing TDRs, beginning of period	67,775		72,852		72,852
New TDR Status	17,882		14,412
Paydowns	(2,237)		(46)
Charge-offs post modification	(121)		0
Transfer to nonaccrual, past due 90 days or greater	(4,830)		(4,796)
Cured	(12,341)		(10,371)
Other, net	(355)	[1]	30	[1]
Performing TDRs, end of period	65,773		72,081		67,775
Non-performing TDRs, end of period	25,808	[2],[3]	18,720	[2]	24,603	[3]
Performing TDRs	72.00%		79.00%		73.00%
Non-performing TDRs	28.00%		21.00%		27.00%
Transferred To OREO	$ 203

[1] Includes $203 transferred to OREO.

[2] Included in Age Analysis of Past Due Financing Receivables.

[3] These loans are included in the 90 day past due and non-accrual categories.