Summary Of Significant Accounting Policies (Narrative) (Detail)	6 Months Ended
	Jun. 30, 2013 condition element
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Number of grace period days to become non-accrual loans	90 days
Term past due loans places on non-accrual status	90 days
Number of grace period days to charge-off loans	180 days
Number of allowance for loan and lease loss elements	3
Number of TDR conditions	2
Minimum period troubled debt restructurings placed on non-accrual status	6 months
Minimum [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Minimum Demonstrated Performance Period Troubled Debt Restructurings Returned To Accrual Status	6 months
Maximum [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Minimum demonstrated performance period troubled debt restructurings returned to accrual status	1 year