Fair Value Of Assets And Liabilities (Schedule Of Asset Impairment Or Valuation Adjustment Recognized At Fair Value On A Nonrecurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Nonrecurring assets	$ 4,370	$ 3,729	$ 4,268
Nonrecurring asset, (gain) loss	(266)	244	889
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Nonrecurring assets	2,694	2,217	204
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Nonrecurring assets	1,676	1,512	4,064
Loans Measured For Impairment [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Nonrecurring assets	3,676	3,729	2,836
Nonrecurring asset, (gain) loss	(439)	244	797
Loans Measured For Impairment [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Nonrecurring assets	2,694	2,217	204
Loans Measured For Impairment [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Nonrecurring assets	982	1,512	2,632
Other Real Estate Owned [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Nonrecurring assets	694		1,432
Nonrecurring asset, (gain) loss	173		92
Other Real Estate Owned [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Nonrecurring assets	$ 694		$ 1,432