Credit Quality (Schedule Of Troubled Debt Restructurings By Class Of Loan, Charge-Offs) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 Contract	Dec. 31, 2011 Contract
Financing Receivable, Modifications [Line Items]
Number of Contracts	1	2
Recorded Investment	$ 375	$ 0
Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	0
Recorded Investment	0	0
Nonowner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	0
Recorded Investment	0	0
Other Commercial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	0
Recorded Investment	0	0
Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	2
Recorded Investment	0	0
Construction & Land Development [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	1	0
Recorded Investment	375	0
Bankcard [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	0
Recorded Investment	0	0
Other Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	0
Recorded Investment	$ 0	$ 0