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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Fair Value Measurements (Details) (USD $)	Mar. 31, 2013	Mar. 31, 2012 PreTSLs	Mar. 31, 2012 Significant other unobservable inputs (Level 3) Obligations of political and state subdivisions item	Mar. 31, 2013 Recurring Basis Fair value	Dec. 31, 2012 Recurring Basis Fair value	Mar. 31, 2013 Recurring Basis Fair value Obligations of U.S. government agencies	Dec. 31, 2012 Recurring Basis Fair value Obligations of U.S. government agencies	Mar. 31, 2013 Recurring Basis Fair value Obligations of political and state subdivisions	Dec. 31, 2012 Recurring Basis Fair value Obligations of political and state subdivisions	Mar. 31, 2013 Recurring Basis Fair value Government sponsored agency CMOs	Dec. 31, 2012 Recurring Basis Fair value Government sponsored agency CMOs	Mar. 31, 2013 Recurring Basis Fair value Residential mortgage-backed securities	Dec. 31, 2012 Recurring Basis Fair value Residential mortgage-backed securities	Mar. 31, 2013 Recurring Basis Fair value Corporate debt securities	Dec. 31, 2012 Recurring Basis Fair value Corporate debt securities	Mar. 31, 2013 Recurring Basis Fair value Equity securities	Dec. 31, 2012 Recurring Basis Fair value Equity securities	Mar. 31, 2013 Recurring Basis Quoted prices in active markets for identical assets (Level 1)	Dec. 31, 2012 Recurring Basis Quoted prices in active markets for identical assets (Level 1)	Mar. 31, 2013 Recurring Basis Quoted prices in active markets for identical assets (Level 1) Equity securities	Dec. 31, 2012 Recurring Basis Quoted prices in active markets for identical assets (Level 1) Equity securities	Mar. 31, 2013 Recurring Basis Significant other observable inputs (Level 2)	Dec. 31, 2012 Recurring Basis Significant other observable inputs (Level 2)	Mar. 31, 2013 Recurring Basis Significant other observable inputs (Level 2) Obligations of U.S. government agencies	Dec. 31, 2012 Recurring Basis Significant other observable inputs (Level 2) Obligations of U.S. government agencies	Mar. 31, 2013 Recurring Basis Significant other observable inputs (Level 2) Obligations of political and state subdivisions	Dec. 31, 2012 Recurring Basis Significant other observable inputs (Level 2) Obligations of political and state subdivisions	Mar. 31, 2013 Recurring Basis Significant other observable inputs (Level 2) Government sponsored agency CMOs	Dec. 31, 2012 Recurring Basis Significant other observable inputs (Level 2) Government sponsored agency CMOs	Mar. 31, 2013 Recurring Basis Significant other observable inputs (Level 2) Residential mortgage-backed securities	Dec. 31, 2012 Recurring Basis Significant other observable inputs (Level 2) Residential mortgage-backed securities	Mar. 31, 2013 Recurring Basis Significant other observable inputs (Level 2) Corporate debt securities	Dec. 31, 2012 Recurring Basis Significant other observable inputs (Level 2) Corporate debt securities	Mar. 31, 2013 Recurring Basis Significant other unobservable inputs (Level 3)	Dec. 31, 2012 Recurring Basis Significant other unobservable inputs (Level 3)	Mar. 31, 2013 Recurring Basis Significant other unobservable inputs (Level 3) Obligations of political and state subdivisions	Dec. 31, 2012 Recurring Basis Significant other unobservable inputs (Level 3) Obligations of political and state subdivisions
Assets Measured at Fair Value on a Recurring Basis
Amortized Cost		$ 10,500,000	$ 1,600,000
Number of securities owned			2
Number of securities valued based on similar securities			1
Total securities available-for-sale	$ 215,855,000	$ 4,000,000		$ 216,849,000	$ 185,361,000	$ 1,870,000	$ 1,891,000	$ 102,709,000	$ 103,501,000	$ 16,408,000	$ 9,103,000	$ 94,453,000	$ 69,456,000	$ 415,000	$ 410,000	$ 994,000	$ 1,000,000	$ 994,000	$ 1,000,000	$ 994,000	$ 1,000,000	$ 214,251,000	$ 182,622,000	$ 1,870,000	$ 1,891,000	$ 101,105,000	$ 101,762,000	$ 16,408,000	$ 9,103,000	$ 94,453,000	$ 69,456,000	$ 415,000	$ 410,000	$ 1,604,000	$ 1,739,000	$ 1,604,000	$ 1,739,000