Fair Value of Instruments (Details 1) (Fair Value on a Recurring Basis [Member], USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets measured at fair value on a recurring basis
Total Securities Available for Sale	$ 31,551	$ 26,691
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| U.S. Treasury [Member]
Financial assets measured at fair value on a recurring basis
Total Securities Available for Sale	31,551	26,691
Significant Observable Inputs (Level 2) [Member]
Financial assets measured at fair value on a recurring basis
Total Securities Available for Sale	309,870	287,127
Significant Observable Inputs (Level 2) [Member] \| U.S. Government agency [Member]
Financial assets measured at fair value on a recurring basis
Total Securities Available for Sale	193,081	177,797
Significant Observable Inputs (Level 2) [Member] \| Mortgage-backed securities [Member]
Financial assets measured at fair value on a recurring basis
Total Securities Available for Sale	61,894	55,413
Significant Observable Inputs (Level 2) [Member] \| State and local governments [Member]
Financial assets measured at fair value on a recurring basis
Total Securities Available for Sale	54,895	53,917
Significant Unobservable Inputs (Level 3) [Member]
Financial assets measured at fair value on a recurring basis
Total Securities Available for Sale	15,729	13,701
Significant Unobservable Inputs (Level 3) [Member] \| State and local governments [Member]
Financial assets measured at fair value on a recurring basis
Total Securities Available for Sale	$ 15,729	$ 13,701

- 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.

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