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Loans and Allowance for Loan Losses - Summary of Recorded Investment Based on Delinquency Status (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total ending loans balance $ 891,300 $ 882,548 $ 885,715
Commercial Real Estate
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total ending loans balance 404,031 414,005 411,924
Commercial
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total ending loans balance 79,813 68,705 71,922
Residential Real Estate
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total ending loans balance 65,397 64,983 68,549
Home Equity Loans
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total ending loans balance 122,285 122,830 125,108
Indirect
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total ending loans balance 206,349 199,924 195,358
Consumer
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total ending loans balance 13,425 12,101 12,854
Commercial Credit Exposure
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 454,111 444,671  
Total loans internally credit risk graded 490,617 490,430  
Total loans not internally credit risk graded 400,683 392,118  
Total ending loans balance 891,300 882,548  
Commercial Credit Exposure | Grade 1-Minimal
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 74 114  
Commercial Credit Exposure | Grade 2-Modest
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 37 0  
Commercial Credit Exposure | Grade 3-Better than average
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 866 1,106  
Commercial Credit Exposure | Grade 4-Average
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 28,663 35,777  
Commercial Credit Exposure | Grade 5-Acceptable
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 424,471 407,674  
Commercial Credit Exposure | Grade 6-Special mention
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans internally credit risk graded 13,857 15,637  
Commercial Credit Exposure | Grade 7-Substandard
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans internally credit risk graded 22,649 29,357  
Commercial Credit Exposure | Grade 8-Doubtful
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans internally credit risk graded 0 765  
Commercial Credit Exposure | Grade 9-Loss
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans internally credit risk graded 0 0  
Commercial Credit Exposure | Current loans not internally risk graded
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans not internally credit risk graded 394,044 385,507  
Commercial Credit Exposure | 30-59 days past due loans not internally risk graded
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans not internally credit risk graded 1,887 1,695  
Commercial Credit Exposure | 60-89 days past due loans not internally risk graded
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans not internally credit risk graded 1,007 1,855  
Commercial Credit Exposure | 90 days past due loans not internally risk graded
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans not internally credit risk graded 3,745 3,061  
Commercial Credit Exposure | Commercial Real Estate
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 371,634 373,771  
Total loans internally credit risk graded 404,031 414,005  
Total loans not internally credit risk graded 0 0  
Total ending loans balance 404,031 414,005  
Commercial Credit Exposure | Commercial Real Estate | Grade 1-Minimal
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 0 0  
Commercial Credit Exposure | Commercial Real Estate | Grade 2-Modest
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 0 0  
Commercial Credit Exposure | Commercial Real Estate | Grade 3-Better than average
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 866 1,100  
Commercial Credit Exposure | Commercial Real Estate | Grade 4-Average
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 27,181 30,604  
Commercial Credit Exposure | Commercial Real Estate | Grade 5-Acceptable
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 343,587 342,067  
Commercial Credit Exposure | Commercial Real Estate | Grade 6-Special mention
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans internally credit risk graded 10,671 12,201  
Commercial Credit Exposure | Commercial Real Estate | Grade 7-Substandard
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans internally credit risk graded 21,726 27,268  
Commercial Credit Exposure | Commercial Real Estate | Grade 8-Doubtful
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans internally credit risk graded 0 765  
Commercial Credit Exposure | Commercial Real Estate | Grade 9-Loss
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans internally credit risk graded 0 0  
Commercial Credit Exposure | Commercial Real Estate | Current loans not internally risk graded
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans not internally credit risk graded 0 0  
Commercial Credit Exposure | Commercial Real Estate | 30-59 days past due loans not internally risk graded
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans not internally credit risk graded 0 0  
Commercial Credit Exposure | Commercial Real Estate | 60-89 days past due loans not internally risk graded
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans not internally credit risk graded 0 0  
Commercial Credit Exposure | Commercial Real Estate | 90 days past due loans not internally risk graded
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans not internally credit risk graded 0 0  
Commercial Credit Exposure | Commercial
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 76,309 64,690  
Total loans internally credit risk graded 79,813 68,705  
Total loans not internally credit risk graded 0 0  
Total ending loans balance 79,813 68,705  
Commercial Credit Exposure | Commercial | Grade 1-Minimal
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 74 114  
Commercial Credit Exposure | Commercial | Grade 2-Modest
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 37 0  
Commercial Credit Exposure | Commercial | Grade 3-Better than average
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 0 6  
Commercial Credit Exposure | Commercial | Grade 4-Average
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 866 4,547  
Commercial Credit Exposure | Commercial | Grade 5-Acceptable
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 75,332 60,023  
Commercial Credit Exposure | Commercial | Grade 6-Special mention
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans internally credit risk graded 3,149 3,394  
Commercial Credit Exposure | Commercial | Grade 7-Substandard
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans internally credit risk graded 355 621  
Commercial Credit Exposure | Commercial | Grade 8-Doubtful
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans internally credit risk graded 0 0  
Commercial Credit Exposure | Commercial | Grade 9-Loss
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans internally credit risk graded 0 0  
Commercial Credit Exposure | Commercial | Current loans not internally risk graded
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans not internally credit risk graded 0 0  
Commercial Credit Exposure | Commercial | 30-59 days past due loans not internally risk graded
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans not internally credit risk graded 0 0  
Commercial Credit Exposure | Commercial | 60-89 days past due loans not internally risk graded
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans not internally credit risk graded 0 0  
Commercial Credit Exposure | Commercial | 90 days past due loans not internally risk graded
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans not internally credit risk graded 0 0  
Commercial Credit Exposure | Residential Real Estate
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 6,168 [1] 6,210 [1]  
Total loans internally credit risk graded 6,773 [1] 7,720 [1]  
Total loans not internally credit risk graded 58,624 [1] 57,263 [1]  
Total ending loans balance 65,397 [1] 64,983 [1]  
Commercial Credit Exposure | Residential Real Estate | Grade 1-Minimal
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 0 [1] 0 [1]  
Commercial Credit Exposure | Residential Real Estate | Grade 2-Modest
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 0 [1] 0 [1]  
Commercial Credit Exposure | Residential Real Estate | Grade 3-Better than average
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 0 [1] 0 [1]  
Commercial Credit Exposure | Residential Real Estate | Grade 4-Average
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 616 [1] 626 [1]  
Commercial Credit Exposure | Residential Real Estate | Grade 5-Acceptable
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 5,552 [1] 5,584 [1]  
Commercial Credit Exposure | Residential Real Estate | Grade 6-Special mention
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans internally credit risk graded 37 [1] 42 [1]  
Commercial Credit Exposure | Residential Real Estate | Grade 7-Substandard
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans internally credit risk graded 568 [1] 1,468 [1]  
Commercial Credit Exposure | Residential Real Estate | Grade 8-Doubtful
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans internally credit risk graded 0 [1] 0 [1]  
Commercial Credit Exposure | Residential Real Estate | Grade 9-Loss
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans internally credit risk graded 0 [1] 0 [1]  
Commercial Credit Exposure | Residential Real Estate | Current loans not internally risk graded
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans not internally credit risk graded 55,131 [1] 54,416 [1]  
Commercial Credit Exposure | Residential Real Estate | 30-59 days past due loans not internally risk graded
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans not internally credit risk graded 377 [1] 394 [1]  
Commercial Credit Exposure | Residential Real Estate | 60-89 days past due loans not internally risk graded
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans not internally credit risk graded 586 [1] 1,094 [1]  
Commercial Credit Exposure | Residential Real Estate | 90 days past due loans not internally risk graded
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans not internally credit risk graded 2,530 [1] 1,359 [1]  
Commercial Credit Exposure | Home Equity Loans
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 0 0  
Total loans internally credit risk graded 0 0  
Total loans not internally credit risk graded 122,285 122,830  
Total ending loans balance 122,285 122,830  
Commercial Credit Exposure | Home Equity Loans | Grade 1-Minimal
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 0 0  
Commercial Credit Exposure | Home Equity Loans | Grade 2-Modest
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 0 0  
Commercial Credit Exposure | Home Equity Loans | Grade 3-Better than average
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 0 0  
Commercial Credit Exposure | Home Equity Loans | Grade 4-Average
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 0 0  
Commercial Credit Exposure | Home Equity Loans | Grade 5-Acceptable
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 0 0  
Commercial Credit Exposure | Home Equity Loans | Grade 6-Special mention
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans internally credit risk graded 0 0  
Commercial Credit Exposure | Home Equity Loans | Grade 7-Substandard
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans internally credit risk graded 0 0  
Commercial Credit Exposure | Home Equity Loans | Grade 8-Doubtful
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans internally credit risk graded 0 0  
Commercial Credit Exposure | Home Equity Loans | Grade 9-Loss
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans internally credit risk graded 0 0  
Commercial Credit Exposure | Home Equity Loans | Current loans not internally risk graded
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans not internally credit risk graded 119,764 120,196  
Commercial Credit Exposure | Home Equity Loans | 30-59 days past due loans not internally risk graded
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans not internally credit risk graded 1,094 630  
Commercial Credit Exposure | Home Equity Loans | 60-89 days past due loans not internally risk graded
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans not internally credit risk graded 362 494  
Commercial Credit Exposure | Home Equity Loans | 90 days past due loans not internally risk graded
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans not internally credit risk graded 1,065 1,510  
Commercial Credit Exposure | Indirect
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 0 0  
Total loans internally credit risk graded 0 0  
Total loans not internally credit risk graded 206,349 199,924  
Total ending loans balance 206,349 199,924  
Commercial Credit Exposure | Indirect | Grade 1-Minimal
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 0 0  
Commercial Credit Exposure | Indirect | Grade 2-Modest
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 0 0  
Commercial Credit Exposure | Indirect | Grade 3-Better than average
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 0 0  
Commercial Credit Exposure | Indirect | Grade 4-Average
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 0 0  
Commercial Credit Exposure | Indirect | Grade 5-Acceptable
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 0 0  
Commercial Credit Exposure | Indirect | Grade 6-Special mention
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans internally credit risk graded 0 0  
Commercial Credit Exposure | Indirect | Grade 7-Substandard
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans internally credit risk graded 0 0  
Commercial Credit Exposure | Indirect | Grade 8-Doubtful
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans internally credit risk graded 0 0  
Commercial Credit Exposure | Indirect | Grade 9-Loss
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans internally credit risk graded 0 0  
Commercial Credit Exposure | Indirect | Current loans not internally risk graded
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans not internally credit risk graded 206,024 198,983  
Commercial Credit Exposure | Indirect | 30-59 days past due loans not internally risk graded
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans not internally credit risk graded 225 645  
Commercial Credit Exposure | Indirect | 60-89 days past due loans not internally risk graded
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans not internally credit risk graded 59 227  
Commercial Credit Exposure | Indirect | 90 days past due loans not internally risk graded
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans not internally credit risk graded 41 69  
Commercial Credit Exposure | Consumer
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 0 0  
Total loans internally credit risk graded 0 0  
Total loans not internally credit risk graded 13,425 12,101  
Total ending loans balance 13,425 12,101  
Commercial Credit Exposure | Consumer | Grade 1-Minimal
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 0 0  
Commercial Credit Exposure | Consumer | Grade 2-Modest
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 0 0  
Commercial Credit Exposure | Consumer | Grade 3-Better than average
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 0 0  
Commercial Credit Exposure | Consumer | Grade 4-Average
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 0 0  
Commercial Credit Exposure | Consumer | Grade 5-Acceptable
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 0 0  
Commercial Credit Exposure | Consumer | Grade 6-Special mention
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans internally credit risk graded 0 0  
Commercial Credit Exposure | Consumer | Grade 7-Substandard
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans internally credit risk graded 0 0  
Commercial Credit Exposure | Consumer | Grade 8-Doubtful
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans internally credit risk graded 0 0  
Commercial Credit Exposure | Consumer | Grade 9-Loss
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans internally credit risk graded 0 0  
Commercial Credit Exposure | Consumer | Current loans not internally risk graded
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans not internally credit risk graded 13,125 11,912  
Commercial Credit Exposure | Consumer | 30-59 days past due loans not internally risk graded
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans not internally credit risk graded 191 26  
Commercial Credit Exposure | Consumer | 60-89 days past due loans not internally risk graded
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans not internally credit risk graded 0 40  
Commercial Credit Exposure | Consumer | 90 days past due loans not internally risk graded
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans not internally credit risk graded $ 109 $ 123  
[1] Residential loans with an internal commercial credit risk grade include loans that are secured by non owner occupied 1-4 family residential properties and conventional 1-4 family residential properties.