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Allowance for Loan Loss (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Financing Receivable, Allowance for Credit Losses $ 6,919 $ 7,676 $ 6,495
Financing Receivable, Allowance for Credit Losses, Charge-offs (4,334) (3,413) (2,687)
Financing Receivable, Allowance for Credit Losses, Recoveries 323 206 288
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries (4,011) (3,207) (2,399)
Provision for loan losses 3,815 2,450 3,580
Financing Receivable, Allowance for Credit Losses 6,723 6,919 7,676
Commercial and Industrial Loans [Member]
      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Financing Receivable, Allowance for Credit Losses 948 972  
Financing Receivable, Allowance for Credit Losses, Charge-offs (289) (679)  
Financing Receivable, Allowance for Credit Losses, Recoveries 54 34  
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries (235) (645)  
Provision for loan losses 99 621  
Financing Receivable, Allowance for Credit Losses 812 948  
Construction And Land Development Loans [Member]
      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Financing Receivable, Allowance for Credit Losses 1,470 2,223  
Financing Receivable, Allowance for Credit Losses, Charge-offs (231) (1,758)  
Financing Receivable, Allowance for Credit Losses, Recoveries 46 2  
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries (185) (1,756)  
Provision for loan losses 260 1,003  
Financing Receivable, Allowance for Credit Losses 1,545 1,470  
Commercial Real Estate Loans, Total [Member]
      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Financing Receivable, Allowance for Credit Losses 3,009 2,893  
Financing Receivable, Allowance for Credit Losses, Charge-offs (3,184) (422)  
Financing Receivable, Allowance for Credit Losses, Recoveries 71 0  
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries (3,113) (422)  
Provision for loan losses 3,241 538  
Financing Receivable, Allowance for Credit Losses 3,137 3,009  
Residential Real Estate Loans, Total [Member]
      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Financing Receivable, Allowance for Credit Losses 1,363 1,336  
Financing Receivable, Allowance for Credit Losses, Charge-offs (545) (533)  
Financing Receivable, Allowance for Credit Losses, Recoveries 134 155  
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries (411) (378)  
Provision for loan losses 174 405  
Financing Receivable, Allowance for Credit Losses 1,126 1,363  
Consumer Installment and Revolving Loans [Member]
      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Financing Receivable, Allowance for Credit Losses 129 141  
Financing Receivable, Allowance for Credit Losses, Charge-offs (85) (21)  
Financing Receivable, Allowance for Credit Losses, Recoveries 18 15  
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries (67) (6)  
Provision for loan losses 41 (6)  
Financing Receivable, Allowance for Credit Losses 103 129  
Financing Receivable, Allowance For Loan Loss, Unallocated [Member]
      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Financing Receivable, Allowance for Credit Losses 0 111  
Financing Receivable, Allowance for Credit Losses, Charge-offs 0 0  
Financing Receivable, Allowance for Credit Losses, Recoveries 0 0  
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries 0 0  
Provision for loan losses 0 (111)  
Financing Receivable, Allowance for Credit Losses $ 0 $ 0