Loans (Troubled Debt Restructuring That Became Nonperforming Within 12 Months Of Restructuring) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
Financing Receivable, Modifications [Line Items]
Number of Borrowers	2		14		1		10
Recorded Investment	$ 16,597	[1]	$ 10,455	[1]	$ 16,500	[1]	$ 8,996	[1]
Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Number of Borrowers	1		3		1		1
Recorded Investment	16,500	[1]	400	[1]	16,500	[1]	245	[1]
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Borrowers	1		10				9
Recorded Investment	97	[1]	9,095	[1]			8,751	[1]
Construction Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Borrowers			1
Recorded Investment			$ 960	[1]

[1] Represents amounts as of the balance sheet date from the quarter the default was first reported.