Securities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Fair value of securities
Total available for sale investment securities, Amortized Cost	$ 462,552	$ 463,306
Gross Unrealized Gains	17,770	19,663
Gross Unrealized Losses	(346)	(168)
Available-for-sale Securities, Fair Value	479,976	482,801
Held-to-maturity, Amortized Cost	2,110
U.S. Treasury and federal agencies [Member]
Fair value of securities
Total available for sale investment securities, Amortized Cost	45,974	51,458
Gross Unrealized Gains	281	351
Gross Unrealized Losses	(38)	(30)
Available-for-sale Securities, Fair Value	46,217	51,779
State and municipal [Member]
Fair value of securities
Total available for sale investment securities, Amortized Cost	160,824	162,147
Gross Unrealized Gains	9,864	10,842
Gross Unrealized Losses	(199)	(84)
Available-for-sale Securities, Fair Value	170,489	172,905
Held-to-maturity, Amortized Cost	2,110
Held-to-maturity, Gross Unrealized Gains
Held-to-maturity, Gross Unrealized Losses
Held-to-maturity, Fair Value	2,110
Federal agency collateralized mortgage obligations [Member]
Fair value of securities
Total available for sale investment securities, Amortized Cost	109,727	95,337
Gross Unrealized Gains	1,591	1,533
Gross Unrealized Losses	(83)	(39)
Available-for-sale Securities, Fair Value	111,235	96,831
Federal agency mortgage-backed pools [Member]
Fair value of securities
Total available for sale investment securities, Amortized Cost	144,300	152,372
Gross Unrealized Gains	5,956	6,847
Gross Unrealized Losses	(26)	(15)
Available-for-sale Securities, Fair Value	150,230	159,204
Private labeled mortgage-backed pools [Member]
Fair value of securities
Total available for sale investment securities, Amortized Cost	1,695	1,960
Gross Unrealized Gains	61	71
Available-for-sale Securities, Fair Value	1,756	2,031
Corporate notes [Member]
Fair value of securities
Total available for sale investment securities, Amortized Cost	32	32
Gross Unrealized Gains	17	19
Available-for-sale Securities, Fair Value	$ 49	$ 51

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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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.

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- Definition

This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

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- Definition

For an unclassified balance sheet, this item represents investments in debt securities which are categorized as held-to-maturity. The held-to-maturity category is for those securities that the entity has the positive intent and ability to hold until maturity.

+ References

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Reference 7: http://www.xbrl.org/2003/role/presentationRef

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Reference 8: http://www.xbrl.org/2003/role/presentationRef

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Reference 9: http://www.xbrl.org/2003/role/presentationRef

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-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 10: http://www.xbrl.org/2003/role/presentationRef

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Reference 11: http://www.xbrl.org/2003/role/presentationRef

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Reference 12: http://www.xbrl.org/2003/role/presentationRef

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+ Details

- Definition

+ References+ Details