Loans And Allowance For Loan Losses (Summary Of Troubled Debt Restructurings By Class Of Loans, Payment Default) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012 Contract		Dec. 31, 2011 Contract
Financing Receivable, Modifications [Line Items]
Number of Contracts	46		38
Recorded Investment	$ 483	[1]	$ 2,552	[1]
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts			6
Recorded Investment		[1]	2,241	[1]
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts			1
Commercial Leases [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts
Recorded Investment		[1]		[1]
Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts			7
Recorded Investment			2,241	[1]
Direct Installment [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	38		25
Recorded Investment	249	[1]	147	[1]
Residential Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	5		3
Recorded Investment	229	[1]	159	[1]
Indirect Installment [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	3		3
Recorded Investment	5	[1]	5	[1]
Consumer Lines Of Credit [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts
Recorded Investment		[1]		[1]
Other [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts
Recorded Investment		[1]		[1]

[1] The recorded investment is as of period end.