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Loans (Summary Of Impaired Loans) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Financing Receivable, Impaired [Line Items]    
Recorded Investment, With no related allowance recorded $ 1,903 [1] $ 1,874 [1]
Recorded Investment, With an allowance recorded 6,480 [1]  
Recorded Investment 8,383 [1] 3,338 [1]
Unpaid Principal Balance, With no related allowance recorded 2,402 [1] 2,427 [1]
Unpaid Principal Balance, With an allowance recorded 6,480 [1]  
Unpaid Principal Balance 8,882 [1] 3,338 [1]
Related Allowance 1,992 974
Average Recorded Investment, With no related allowance recorded 1,845 2,065
Average Recorded Investment, With an allowance recorded 4,102  
Average Recorded Investment 5,947 3,972
Interest Income Recognized, With no related allowance recorded      
Interest Income Recognized, With an allowance recorded     
Interest Income Recognized      
Commercial Business [Member]
   
Financing Receivable, Impaired [Line Items]    
Recorded Investment, With no related allowance recorded 1,076 [1] 963 [1]
Recorded Investment, With an allowance recorded 4,540 [1] 2,450 [1]
Unpaid Principal Balance, With no related allowance recorded 1,484 [1] 1,425 [1]
Unpaid Principal Balance, With an allowance recorded 4,540 [1] 2,450 [1]
Related Allowance 1,335 664
Average Recorded Investment, With no related allowance recorded 960 755
Average Recorded Investment, With an allowance recorded 2,957 2,114
Interest Income Recognized, With no related allowance recorded      
Interest Income Recognized, With an allowance recorded      
Commercial Mortgage [Member]
   
Financing Receivable, Impaired [Line Items]    
Recorded Investment, With no related allowance recorded 827 [1] 911 [1]
Recorded Investment, With an allowance recorded 1,940 [1] 888 [1]
Unpaid Principal Balance, With no related allowance recorded 918 [1] 1,002 [1]
Unpaid Principal Balance, With an allowance recorded 1,940 [1] 888 [1]
Related Allowance 657 310
Average Recorded Investment, With no related allowance recorded 885 1,310
Average Recorded Investment, With an allowance recorded 1,145 1,858
Interest Income Recognized, With no related allowance recorded      
Interest Income Recognized, With an allowance recorded      
[1] Difference between recorded investment and unpaid principal balance represents partial charge-offs.