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Disclosures about fair value of assets and liabilities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Assets
Total available for sale securities, Fair Value	$ 479,976	$ 482,801
Recurring basis [Member]
Assets
Total available for sale securities, Fair Value	479,976	482,801
Recurring basis [Member] | Hedged loans [Member]
Assets
Available-for-sale securities	75,601	81,018
Recurring basis [Member] | Forward sale commitments [Member]
Assets
Available-for-sale securities	846	858
Recurring basis [Member] | Interest rate swap agreements [Member]
Assets
Available-for-sale securities	(6,868)	(7,707)
Recurring basis [Member] | Commitments to originate loans [Member]
Assets
Available-for-sale securities
Recurring basis [Member] | U.S. Treasury and federal agencies [Member]
Assets
Total available for sale securities, Fair Value	46,217	51,779
Recurring basis [Member] | State and municipal [Member]
Assets
Total available for sale securities, Fair Value	170,489	172,905
Recurring basis [Member] | Federal agency collateralized mortgage obligations [Member]
Assets
Total available for sale securities, Fair Value	111,235	96,831
Recurring basis [Member] | Federal agency mortgage-backed pools [Member]
Assets
Total available for sale securities, Fair Value	150,230	159,204
Recurring basis [Member] | Private labeled mortgage-backed pools [Member]
Assets
Total available for sale securities, Fair Value	1,756	2,031
Recurring basis [Member] | Corporate notes [Member]
Assets
Total available for sale securities, Fair Value	49	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] | Hedged loans [Member]
Assets
Available-for-sale securities
Recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Forward sale commitments [Member]
Assets
Available-for-sale securities
Recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Interest rate swap agreements [Member]
Assets
Available-for-sale securities
Recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Commitments to originate loans [Member]
Assets
Available-for-sale securities
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	479,976	482,801
Recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Hedged loans [Member]
Assets
Available-for-sale securities	75,601	81,018
Recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Forward sale commitments [Member]
Assets
Available-for-sale securities	846	858
Recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Interest rate swap agreements [Member]
Assets
Available-for-sale securities	(6,868)	(7,707)
Recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Commitments to originate loans [Member]
Assets
Available-for-sale securities
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	46,217	51,779
Recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | State and municipal [Member]
Assets
Total available for sale securities, Fair Value	170,489	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	111,235	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	150,230	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	1,756	2,031
Recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Corporate notes [Member]
Assets
Total available for sale securities, Fair Value	49	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] | Hedged loans [Member]
Assets
Available-for-sale securities
Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Forward sale commitments [Member]
Assets
Available-for-sale securities
Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Interest rate swap agreements [Member]
Assets
Available-for-sale securities
Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Commitments to originate loans [Member]
Assets
Available-for-sale securities
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

X

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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

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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 Statement of Financial Accounting Standard (FAS)

-Number 107

-Paragraph 10

-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

-Topic 815

-SubTopic 10

-Section 45

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 4, 17

-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.

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