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Loans and the Allowance for Loan Losses (Analysis of Impaired Loans) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Financing Receivable, Impaired [Line Items]      
No Related Allowance: Recorded Invesment $ 1,500   $ 1,500
No Related Allowance: Unpaid Principal Balance 1,950   1,950
With An Allowance Recorded: Recorded Investment 5,394   5,435
With An Allowance Recorded: Unpaid Principal Balance 5,394   5,435
With An Allowance Recorded: Related Allowance 585   645
Total Impaired: Recorded Investment 6,894   6,935
Total Impaired: Unpaid Principal Balance 7,344   7,385
Total Impaired: Related Allowance 585   645
No Related Allowance: Average Recorded Investment 1,500 2,105  
No Related Allowance: Interest Income Recognized 19 30  
With An Allowance Recorded: Average Recorded Investment 5,429 11,693  
With An Allowance Recorded: Interest Income Recognized 44 61  
Total Impaired: Average Recorded Investment 6,929 13,798  
Total Impaired: Interest Income Recognized 63 91  
Commercial real estate [Member]
      
Financing Receivable, Impaired [Line Items]      
No Related Allowance: Recorded Invesment 1,500   1,500
No Related Allowance: Unpaid Principal Balance 1,950   1,950
With An Allowance Recorded: Recorded Investment 4,180   4,180
With An Allowance Recorded: Unpaid Principal Balance 4,180   4,180
With An Allowance Recorded: Related Allowance 474   493
Total Impaired: Recorded Investment 5,680   5,680
Total Impaired: Unpaid Principal Balance 6,130   6,130
Total Impaired: Related Allowance 474   493
No Related Allowance: Average Recorded Investment 1,500 2,105  
No Related Allowance: Interest Income Recognized 19 30  
With An Allowance Recorded: Average Recorded Investment 4,180 4,180  
With An Allowance Recorded: Interest Income Recognized 34 35  
Total Impaired: Average Recorded Investment 5,680 6,285  
Total Impaired: Interest Income Recognized 53 65  
Construction [Member]
      
Financing Receivable, Impaired [Line Items]      
With An Allowance Recorded: Average Recorded Investment   3,044  
Total Impaired: Average Recorded Investment   3,044  
Residential mortgage [Member]
      
Financing Receivable, Impaired [Line Items]      
With An Allowance Recorded: Recorded Investment 1,214   1,255
With An Allowance Recorded: Unpaid Principal Balance 1,214   1,255
With An Allowance Recorded: Related Allowance 111   152
Total Impaired: Recorded Investment 1,214   1,255
Total Impaired: Unpaid Principal Balance 1,214   1,255
Total Impaired: Related Allowance 111   152
With An Allowance Recorded: Average Recorded Investment 1,249 4,469  
With An Allowance Recorded: Interest Income Recognized 10 26  
Total Impaired: Average Recorded Investment 1,249 4,469  
Total Impaired: Interest Income Recognized $ 10 $ 26