Loans And Allowance For Loan Losses (Summary Of Composition Of Total TDRs) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	$ 35,139	$ 32,850
Performing Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	11,292	10,130
Nonperforming Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	12,957	11,893
Non-Accrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	$ 10,890	$ 10,827