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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.

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- Definition Fair value disclosure of Common equity securities at the end of the period. + References No definition available. + Details
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- Definition Fair value disclosure of corporate debt securities. + References No definition available. + Details
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- Definition Fair value disclosure of U. S. government-sponsored agencies securities mortgaged backed securities at the end of the period. + References No definition available. + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents securitized, pay-through debt securities collateralized by real estate mortgage loans (mortgages) as of the balance sheet date which have been categorized as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Paragraph 15 -IssueDate 2006-05-01 -Chapter 7 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Mortgage-Backed Securities -URI http://asc.fasb.org/extlink&oid=6517959 + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount of short-term debt existing as of the balance sheet date. + References No definition available. + Details
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