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Fair Value of Financial Instruments (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Financial assets measured at fair value on a recurring basis
Total Securities Available for Sale	$ 355,905	$ 327,519
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value on a Recurring Basis [Member]
Financial assets measured at fair value on a recurring basis
Total Securities Available for Sale	10,568	26,691
Significant Observable Inputs (Level 2) [Member] | Fair Value on a Recurring Basis [Member]
Financial assets measured at fair value on a recurring basis
Total Securities Available for Sale	328,929	287,127
Significant Unobservable Inputs (Level 3) [Member] | Fair Value on a Recurring Basis [Member]
Financial assets measured at fair value on a recurring basis
Total Securities Available for Sale	16,408	13,701
U.S. Treasury [Member]
Financial assets measured at fair value on a recurring basis
Total Securities Available for Sale	10,568	26,691
U.S. Treasury [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value on a Recurring Basis [Member]
Financial assets measured at fair value on a recurring basis
Total Securities Available for Sale	10,568	26,691
U.S. Government agency [Member]
Financial assets measured at fair value on a recurring basis
Total Securities Available for Sale	220,200	177,797
U.S. Government agency [Member] | Significant Observable Inputs (Level 2) [Member] | Fair Value on a Recurring Basis [Member]
Financial assets measured at fair value on a recurring basis
Total Securities Available for Sale	220,200	177,797
Mortgage-backed securities [Member]
Financial assets measured at fair value on a recurring basis
Total Securities Available for Sale	53,006	55,413
Mortgage-backed securities [Member] | Significant Observable Inputs (Level 2) [Member] | Fair Value on a Recurring Basis [Member]
Financial assets measured at fair value on a recurring basis
Total Securities Available for Sale	53,006	55,413
State and local governments [Member]
Financial assets measured at fair value on a recurring basis
Total Securities Available for Sale	72,131	67,618
State and local governments [Member] | Significant Observable Inputs (Level 2) [Member] | Fair Value on a Recurring Basis [Member]
Financial assets measured at fair value on a recurring basis
Total Securities Available for Sale	55,723	53,917
State and local governments [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value on a Recurring Basis [Member]
Financial assets measured at fair value on a recurring basis
Total Securities Available for Sale	$ 16,408	$ 13,701

X

- 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

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration