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Disclosures about fair value of assets and liabilities (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Assets |  |
Total available for sale securities, Fair Value | $ 482,453 | $ 482,801
Recurring basis [Member] |  |
Assets |  |
Total available for sale securities, Fair Value | 482,453 | 482,801
Recurring basis [Member] | U.S. Treasury and federal agencies [Member] |  |
Assets |  |
Total available for sale securities, Fair Value | 38,607 | 51,779
Recurring basis [Member] | State and municipal [Member] |  |
Assets |  |
Total available for sale securities, Fair Value | 180,367 | 172,905
Recurring basis [Member] | Federal agency collateralized mortgage obligations [Member] |  |
Assets |  |
Total available for sale securities, Fair Value | 108,803 | 96,831
Recurring basis [Member] | Federal agency mortgage-backed pools [Member] |  |
Assets |  |
Total available for sale securities, Fair Value | 153,077 | 159,204
Recurring basis [Member] | Private labeled mortgage-backed pools [Member] |  |
Assets |  |
Total available for sale securities, Fair Value | 1,554 | 2,031
Recurring basis [Member] | Corporate notes [Member] |  |
Assets |  |
Total available for sale securities, Fair Value | 45 | 51
Recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Assets |  |
Total available for sale securities, Fair Value |  |
Recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. Treasury and federal agencies [Member] |  |
Assets |  |
Total available for sale securities, Fair Value |  |
Recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | State and municipal [Member] |  |
Assets |  |
Total available for sale securities, Fair Value |  |
Recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Federal agency collateralized mortgage obligations [Member] |  |
Assets |  |
Total available for sale securities, Fair Value |  |
Recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Federal agency mortgage-backed pools [Member] |  |
Assets |  |
Total available for sale securities, Fair Value |  |
Recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Private labeled mortgage-backed pools [Member] |  |
Assets |  |
Total available for sale securities, Fair Value |  |
Recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Corporate notes [Member] |  |
Assets |  |
Total available for sale securities, Fair Value |  |
Recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Assets |  |
Total available for sale securities, Fair Value | 482,453 | 482,801
Recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | U.S. Treasury and federal agencies [Member] |  |
Assets |  |
Total available for sale securities, Fair Value | 38,607 | 51,779
Recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | State and municipal [Member] |  |
Assets |  |
Total available for sale securities, Fair Value | 180,367 | 172,905
Recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Federal agency collateralized mortgage obligations [Member] |  |
Assets |  |
Total available for sale securities, Fair Value | 108,803 | 96,831
Recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Federal agency mortgage-backed pools [Member] |  |
Assets |  |
Total available for sale securities, Fair Value | 153,077 | 159,204
Recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Private labeled mortgage-backed pools [Member] |  |
Assets |  |
Total available for sale securities, Fair Value | 1,554 | 2,031
Recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Corporate notes [Member] |  |
Assets |  |
Total available for sale securities, Fair Value | 45 | 51
Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Assets |  |
Total available for sale securities, Fair Value |  |
Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | U.S. Treasury and federal agencies [Member] |  |
Assets |  |
Total available for sale securities, Fair Value |  |
Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | State and municipal [Member] |  |
Assets |  |
Total available for sale securities, Fair Value |  |
Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Federal agency collateralized mortgage obligations [Member] |  |
Assets |  |
Total available for sale securities, Fair Value |  |
Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Federal agency mortgage-backed pools [Member] |  |
Assets |  |
Total available for sale securities, Fair Value |  |
Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Private labeled mortgage-backed pools [Member] |  |
Assets |  |
Total available for sale securities, Fair Value |  |
Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Corporate notes [Member] |  |
Assets |  |
Total available for sale securities, Fair Value |  |
Hedged loans [Member] | Recurring basis [Member] |  |
Assets |  |
Available-for-sale securities | 83,545 | 81,018
Hedged loans [Member] | Recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Assets |  |
Available-for-sale securities |  |
Hedged loans [Member] | Recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Assets |  |
Available-for-sale securities | 83,545 | 81,018
Hedged loans [Member] | Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Assets |  |
Available-for-sale securities |  |
Forward sale commitments [Member] | Recurring basis [Member] |  |
Assets |  |
Available-for-sale securities | 450 | 858
Forward sale commitments [Member] | Recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Assets |  |
Available-for-sale securities |  |
Forward sale commitments [Member] | Recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Assets |  |
Available-for-sale securities | 450 | 858
Forward sale commitments [Member] | Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Assets |  |
Available-for-sale securities |  |
Interest rate swap agreements [Member] | Recurring basis [Member] |  |
Assets |  |
Available-for-sale securities | (3,842) | (7,707)
Interest rate swap agreements [Member] | Recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Assets |  |
Available-for-sale securities |  |
Interest rate swap agreements [Member] | Recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Assets |  |
Available-for-sale securities | (3,842) | (7,707)
Interest rate swap agreements [Member] | Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Assets |  |
Available-for-sale securities |  |
Commitments to originate loans [Member] | Recurring basis [Member] |  |
Assets |  |
Available-for-sale securities |  |
Commitments to originate loans [Member] | Recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Assets |  |
Available-for-sale securities |  |
Commitments to originate loans [Member] | Recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Assets |  |
Available-for-sale securities |  |
Commitments to originate loans [Member] | Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Assets |  |
Available-for-sale securities |  |

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + 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=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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