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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
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total ending loans balance $ 882,896 $ 882,548 $ 867,459
Commercial Real Estate
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total ending loans balance 407,492 414,005 398,251
Commercial
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total ending loans balance 74,267 68,705 79,461
Residential Real Estate
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total ending loans balance 66,197 64,983 64,834
Home Equity Loans
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total ending loans balance 120,323 122,830 126,568
Indirect
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total ending loans balance 202,486 199,924 184,892
Consumer
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total ending loans balance 12,131 12,101 13,453
Commercial Credit Exposure
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 449,217 444,671  
Total loans internally credit risk graded 489,600 490,430  
Total loans not internally credit risk graded 393,296 392,118  
Total ending loans balance 882,896 882,548  
Commercial Credit Exposure | Grade 1-Minimal
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 75 114  
Commercial Credit Exposure | Grade 2-Modest
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 36 0  
Commercial Credit Exposure | Grade 3-Better than average
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 874 1,106  
Commercial Credit Exposure | Grade 4-Average
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 29,535 35,777  
Commercial Credit Exposure | Grade 5-Acceptable
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 418,697 407,674  
Commercial Credit Exposure | Grade 6-Special mention
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans internally credit risk graded 14,492 15,637  
Commercial Credit Exposure | Grade 7-Substandard
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans internally credit risk graded 25,891 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 386,525 385,507  
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 1,602 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 1,351 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 3,818 3,061  
Commercial Credit Exposure | Commercial Real Estate
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 371,917 373,771  
Total loans internally credit risk graded 407,492 414,005  
Total loans not internally credit risk graded 0 0  
Total ending loans balance 407,492 414,005  
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 874 1,100  
Commercial Credit Exposure | Commercial Real Estate | Grade 4-Average
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 28,056 30,604  
Commercial Credit Exposure | Commercial Real Estate | Grade 5-Acceptable
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 342,987 342,067  
Commercial Credit Exposure | Commercial Real Estate | Grade 6-Special mention
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans internally credit risk graded 11,332 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 24,243 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 70,828 64,690  
Total loans internally credit risk graded 74,267 68,705  
Total loans not internally credit risk graded 0 0  
Total ending loans balance 74,267 68,705  
Commercial Credit Exposure | Commercial | Grade 1-Minimal
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 75 114  
Commercial Credit Exposure | Commercial | Grade 2-Modest
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 36 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 860 4,547  
Commercial Credit Exposure | Commercial | Grade 5-Acceptable
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 69,857 60,023  
Commercial Credit Exposure | Commercial | Grade 6-Special mention
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans internally credit risk graded 3,121 3,394  
Commercial Credit Exposure | Commercial | Grade 7-Substandard
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans internally credit risk graded 318 621  
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 6,472 [1] 6,210 [1]  
Total loans internally credit risk graded 7,841 [1] 7,720 [1]  
Total loans not internally credit risk graded 58,356 [1] 57,263 [1]  
Total ending loans balance 66,197 [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 619 [1] 626 [1]  
Commercial Credit Exposure | Residential Real Estate | Grade 5-Acceptable
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Pass Credits 5,853 [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 39 [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 1,330 [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 55,007 [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 410 [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 388 [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 2,551 [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 120,323 122,830  
Total ending loans balance 120,323 122,830  
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 117,691 120,196  
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 638 630  
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 841 494  
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 1,153 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 202,486 199,924  
Total ending loans balance 202,486 199,924  
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 202,016 198,983  
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 370 645  
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 82 227  
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 18 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 12,131 12,101  
Total ending loans balance 12,131 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 11,811 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 184 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 40 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 $ 96 $ 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.