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Fair value estimates (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Equity securities: [Abstract]    
Total investment securities available-for-sale $ 128,596 $ 139,899
Financial assets [Abstract]    
Investment securities available-for-sale 128,596 139,899
Carrying Value [Member]
    
Equity securities: [Abstract]    
Total investment securities available-for-sale 128,596 139,899
Financial assets [Abstract]    
Cash and cash equivalents 22,389 10,559
Investment securities available-for-sale 128,596 139,899
Loans held for sale 2,242 569
Net loans 451,138 439,754
Accrued interest receivable 2,903 3,448
Restricted equity securities 2,507 2,374
Financial liabilities [Abstract]    
Deposits 538,111 494,283
Short-term borrowings 13,233 43,791
Long-term debt 18,533 18,927
Accrued interest payable 248 284
Fair Value [Member]
    
Equity securities: [Abstract]    
Total investment securities available-for-sale 128,596 139,899
Financial assets [Abstract]    
Cash and cash equivalents 22,389 10,559
Investment securities available-for-sale 128,596 139,899
Loans held for sale 2,287 569
Net loans 465,905 447,717
Accrued interest receivable 2,903 3,448
Restricted equity securities 2,507 2,374
Financial liabilities [Abstract]    
Deposits 542,024 497,680
Short-term borrowings 13,233 43,791
Long-term debt 18,781 19,300
Accrued interest payable 248 284
Maximum [Member]
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Range and weighted average of appraisal adjustments 25.00%  
Range and weighted average of liquidation expenses 10.00%  
Minimum [Member]
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Range and weighted average of appraisal adjustments 20.00%  
Range and weighted average of liquidation expenses 6.00%  
Weighted Average [Member]
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Range and weighted average of appraisal adjustments (24.60%)  
Range and weighted average of liquidation expenses (8.80%)  
Impaired loans [Member]
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Assets, Fair Value Estimate 6,491  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
    
Equity securities: [Abstract]    
Total investment securities available-for-sale 470  
Financial assets [Abstract]    
Cash and cash equivalents 22,389  
Investment securities available-for-sale 470  
Loans held for sale 2,287  
Accrued interest receivable 2,903  
Restricted equity securities 2,507  
Financial liabilities [Abstract]    
Deposits 454,426  
Short-term borrowings 13,233  
Accrued interest payable 248  
Significant Other Observable Inputs (Level 2) [Member]
    
Equity securities: [Abstract]    
Total investment securities available-for-sale 128,126  
Financial assets [Abstract]    
Investment securities available-for-sale 128,126  
Financial liabilities [Abstract]    
Long-term debt 18,781  
Significant Unobservable Inputs (Level 3) [Member]
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Valuation Technique Appraisal of collateral [1]  
Unobservable Input Appraisal adjustments [2]  
Financial assets [Abstract]    
Net loans 465,905  
Financial liabilities [Abstract]    
Deposits 87,598  
Recurring fair value measurements [Member]
    
Investment securities available-for-sale [Abstract]    
U.S. Government-sponsored enterprises 33,015 32,776
State and municipals: [Abstract]    
Taxable 18,482 19,728
Tax-exempt 35,497 39,686
Corporate debt securities 3,491 3,850
Mortgage-backed securities: [Abstract]    
U.S. Government agencies 15,447 16,912
U.S. Government-sponsored enterprises 22,194 26,263
Equity securities: [Abstract]    
Preferred   117
Common 470 567
Total investment securities available-for-sale 128,596 139,899
Total recurring fair value measurements 128,596 139,899
Impaired loans 6,491 7,341
Total nonrecurring fair value measurements 6,491 7,341
Financial assets [Abstract]    
Investment securities available-for-sale 128,596 139,899
Recurring fair value measurements [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
    
Equity securities: [Abstract]    
Common 470 567
Total investment securities available-for-sale 470 567
Total recurring fair value measurements 470 567
Financial assets [Abstract]    
Investment securities available-for-sale 470 567
Recurring fair value measurements [Member] | Significant Other Observable Inputs (Level 2) [Member]
    
Investment securities available-for-sale [Abstract]    
U.S. Government-sponsored enterprises 33,015 32,776
State and municipals: [Abstract]    
Taxable 18,482 19,728
Tax-exempt 35,497 39,686
Corporate debt securities 3,491 3,850
Mortgage-backed securities: [Abstract]    
U.S. Government agencies 15,447 16,912
U.S. Government-sponsored enterprises 22,194 26,263
Equity securities: [Abstract]    
Preferred   117
Total investment securities available-for-sale 128,126 139,332
Total recurring fair value measurements 128,126 139,332
Financial assets [Abstract]    
Investment securities available-for-sale 128,126 139,332
Recurring fair value measurements [Member] | Significant Unobservable Inputs (Level 3) [Member]
    
Equity securities: [Abstract]    
Impaired loans 6,491 7,341
Total nonrecurring fair value measurements $ 6,491 $ 7,341
[1] (1) Fair value is generally determined through independent appraisals of the underlying collateral, which generally include various Level 3 Inputs which are not identifiable.
[2] (2) Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses. The range and weighted average of liquidation expenses and other appraisal adjustments are presented as a percent of the appraisal.