Fair Value Measurements (Details) (USD $)	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Available-for-Sale Securities: [Abstract]
Total Assets Measured at Fair Value On a Recurring Basis	$ 463,177,000	$ 420,809,000	$ 463,177,000	$ 420,809,000	$ 479,820,000
Changes in level 3 assets measured at fair value on a recurring basis [Roll Forward]
Balance at Beginning of Period	5,724,000	0	5,782,000	0
Total Realized and Unrealized Gains/(Losses) Included in Income	0	0	0	0
Total Unrealized Gains/(Losses) Included in Other Comprehensive Income	0	0	0	0
Purchase of Securities	0	0	0	0
Sales, Maturities, and Calls of Securities	(20,000)	0	(78,000)	0
Net Transfers In/(Out) of Level 3	0	0	0	0
Balance at End of Period	5,704,000	0	5,704,000	0
Other Real Estate [Abstract]
Impaired loans with a partial charge-off or where an allowance was established	666,000	5,400,000	666,000	5,400,000	3,000,000
Allowance for loan losses	962,000	1,742,000	962,000	1,742,000	1,636,000
Other Real Estate	2,600,000	3,500,000	2,600,000	3,500,000	2,900,000
ORE, valuation allowance	4,100,000	3,600,000	4,100,000	3,600,000	4,100,000
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Available-for-Sale Securities: [Abstract]
Mortgage Backed Securities	0		0
Total Assets Measured at Fair Value On a Recurring Basis	16,143,000		16,143,000
Impaired Loans [Abstract]
Agricultural	0		0
Commercial Real Estate	0		0
Other Observable Inputs (Level 2) [Member]
Available-for-Sale Securities: [Abstract]
Mortgage Backed Securities	389,812,000		389,812,000
Total Assets Measured at Fair Value On a Recurring Basis	441,330,000		441,330,000
Impaired Loans [Abstract]
Agricultural	0		0
Commercial Real Estate	0		0
Significant Unobservable Inputs (Level 3) [Member]
Available-for-Sale Securities: [Abstract]
Mortgage Backed Securities	0		0
Total Assets Measured at Fair Value On a Recurring Basis	5,704,000		5,704,000
Impaired Loans [Abstract]
Agricultural	184,647,000		184,647,000
Commercial Real Estate	340,570,000		340,570,000
Fair Value, Measurements, Recurring [Member]
Available-for-Sale Securities: [Abstract]
Government Agency & Government-Sponsored Entities	46,971,000	162,750,000	46,971,000	162,750,000	82,595,000
Obligations of States and Political Subdivisions	5,704,000	5,813,000	5,704,000	5,813,000	5,782,000
Mortgage Backed Securities	389,812,000	251,886,000	389,812,000	251,886,000	391,033,000
Corporate Bonds	14,864,000		14,864,000
Other	5,826,000	360,000	5,826,000	360,000	410,000
Total Assets Measured at Fair Value On a Recurring Basis	463,177,000	420,809,000	463,177,000	420,809,000	479,820,000
Fair Value, Measurements, Recurring [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Available-for-Sale Securities: [Abstract]
Government Agency & Government-Sponsored Entities	10,627,000	0	10,627,000	0	21,109,000
Obligations of States and Political Subdivisions	0	0	0	0	0
Mortgage Backed Securities	0	0	0	0	0
Corporate Bonds	0		0
Other	5,516,000	0	5,516,000	0	0
Total Assets Measured at Fair Value On a Recurring Basis	16,143,000	0	16,143,000	0	21,109,000
Fair Value, Measurements, Recurring [Member] \| Other Observable Inputs (Level 2) [Member]
Available-for-Sale Securities: [Abstract]
Government Agency & Government-Sponsored Entities	36,344,000	162,750,000	36,344,000	162,750,000	61,486,000
Obligations of States and Political Subdivisions	0	5,813,000	0	5,813,000	0
Mortgage Backed Securities	389,812,000	251,886,000	389,812,000	251,886,000	391,033,000
Corporate Bonds	14,864,000		14,864,000
Other	310,000	360,000	310,000	360,000	410,000
Total Assets Measured at Fair Value On a Recurring Basis	441,330,000	420,809,000	441,330,000	420,809,000	452,929,000
Fair Value, Measurements, Recurring [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Available-for-Sale Securities: [Abstract]
Government Agency & Government-Sponsored Entities	0	0	0	0	0
Obligations of States and Political Subdivisions	5,704,000	0	5,704,000	0	5,782,000
Mortgage Backed Securities	0	0	0	0	0
Corporate Bonds	0		0
Other	0	0	0	0	0
Total Assets Measured at Fair Value On a Recurring Basis	5,704,000	0	5,704,000	0	5,782,000
Fair Value, Measurements, Nonrecurring [Member]
Impaired Loans [Abstract]
Residential 1st Mortgage	200,000	926,000	200,000	926,000	89,000
Home Equity Lines and Loans	466,000	33,000	466,000	33,000	166,000
Commercial		64,000		64,000	50,000
Agricultural Real Estate		1,367,000		1,367,000
Agricultural		704,000		704,000	409,000
Commercial Real Estate		2,329,000		2,329,000	2,328,000
Total Impaired Loans	666,000	5,423,000	666,000	5,423,000	3,042,000
Other Real Estate [Abstract]
Real Estate Construction	2,553,000	3,045,000	2,553,000	3,045,000	2,553,000
Residential 1st Mortgage		331,000		331,000	371,000
Commercial Real Estate		137,000		137,000
Total Other Real Estate	2,553,000	3,513,000	2,553,000	3,513,000	2,924,000
Total Assets Measured at Fair Value On a Non-Recurring Basis	3,219,000	8,936,000	3,219,000	8,936,000	5,966,000
Fair Value, Measurements, Nonrecurring [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Impaired Loans [Abstract]
Residential 1st Mortgage	0	0	0	0	0
Home Equity Lines and Loans	0	0	0	0	0
Commercial		0		0	0
Agricultural Real Estate		0		0
Agricultural		0		0	0
Commercial Real Estate		0		0	0
Total Impaired Loans	0	0	0	0	0
Other Real Estate [Abstract]
Real Estate Construction	0	0	0	0	0
Residential 1st Mortgage		0		0	0
Commercial Real Estate		0		0
Total Other Real Estate	0	0	0	0	0
Total Assets Measured at Fair Value On a Non-Recurring Basis	0	0	0	0	0
Fair Value, Measurements, Nonrecurring [Member] \| Other Observable Inputs (Level 2) [Member]
Impaired Loans [Abstract]
Residential 1st Mortgage	0	926,000	0	926,000	0
Home Equity Lines and Loans	0	33,000	0	33,000	0
Commercial		0		0	0
Agricultural Real Estate		1,367,000		1,367,000
Agricultural		0		0	0
Commercial Real Estate		2,329,000		2,329,000	0
Total Impaired Loans	0	4,655,000	0	4,655,000	0
Other Real Estate [Abstract]
Real Estate Construction	0	3,045,000	0	3,045,000	0
Residential 1st Mortgage		331,000		331,000	0
Commercial Real Estate		137,000		137,000
Total Other Real Estate	0	3,513,000	0	3,513,000	0
Total Assets Measured at Fair Value On a Non-Recurring Basis	0	8,168,000	0	8,168,000	0
Fair Value, Measurements, Nonrecurring [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Impaired Loans [Abstract]
Residential 1st Mortgage	200,000	0	200,000	0	89,000
Home Equity Lines and Loans	466,000	0	466,000	0	166,000
Commercial		64,000		64,000	50,000
Agricultural Real Estate		0		0
Agricultural		704,000		704,000	409,000
Commercial Real Estate		0		0	2,328,000
Total Impaired Loans	666,000	768,000	666,000	768,000	3,042,000
Other Real Estate [Abstract]
Real Estate Construction	2,553,000	0	2,553,000	0	2,553,000
Residential 1st Mortgage		0		0	371,000
Commercial Real Estate		0		0
Total Other Real Estate	2,553,000	0	2,553,000	0	2,924,000
Total Assets Measured at Fair Value On a Non-Recurring Basis	$ 3,219,000	$ 768,000	$ 3,219,000	$ 768,000	$ 5,966,000

Fair value disclosure of loans and lines of credit made to farmers to finance agricultural production.

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Fair value disclosure for other real estate related to loans secured by farmland.

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No definition available.

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Fair value disclosure of secured and unsecured loans for purposes such as seasonal working capital needs, inventory financing, equipment purchases and acquisitions.

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No definition available.

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Fair value disclosure of loans solely used for business purposes.

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Fair value disclosure for other real estate related to loans solely used for business purposes.

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No definition available.

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No definition available.

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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 capiton 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. Government Agencies = Debentures, notes and other debt securities issued by US government agencies, for example but not limited to, Government National Mortgage Association (GNMA or Ginnie Mae) which have been categorized as available-for-sale. Excludes US treasury Securities. Government Sponsored Entities (GESs) = Debentures, bonds and other debt securities issued by US government sponsored entities, for example, but not limited to, Federal Home Loan Mortgage Corporation (FHLMC or Freddie Mac), Federal National Mortgage Association (FNMA or Fannie Mae), and the Federal Home Loan Bank (FHLB) which have been categorized as available-for-sale.

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Fair value disclosure of revolving, open-end loan extended under a line of credit and secured by the borrower's residential property.

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No definition available.

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Amount of impaired loans with a partial charge-off or where an allowance was established.

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No definition available.

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Fair value disclosure of other real estate related to construction.

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Fair value disclosure of loans to purchase or refinance residential real estate for example, but not limited to a home, in which the real estate itself serves as collateral for the loan.

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No definition available.

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Fair value disclosure of other real estate related to residential first mortgage.

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Fair value disclosure of impaired loans where an allowance for credit losses was established.

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Total fair value disclosure of other real estate assets.

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This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

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No definition available.

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

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-Publisher FASB

-Name Accounting Standards Codification

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Amount of gain (loss) recognized in earnings, arising from assets measured at fair value on a recurring basis using unobservable inputs (level 3).

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Amount of gain (loss) recognized in other comprehensive income, arising from assets measured at fair value on a recurring basis using unobservable inputs (level 3).

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Purchases that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy.

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Sales that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy.

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This element represents [net] transfers in to and out of assets measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period.

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-Name Statement of Financial Accounting Standard (FAS)

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-Paragraph 32

-Subparagraph c(3)

-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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This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances.

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

-Paragraph 2

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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.

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Amount of allowance for credit losses related to recorded investment.

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-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

-Paragraph 15

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-Name Audit and Accounting Guide (AAG)

-Number AAG-DEP

-Paragraph 15

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-Name Accounting Standards Codification

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Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph c

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-Name Regulation S-X (SX)

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The valuation allowance loss on real estate owned or any impairment losses taken against real estate investments held for use or resale.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 10

-Subparagraph 4

-Article 9

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-Paragraph 7, 34

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-Name Accounting Standards Codification

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-SubTopic 10

-Section 35

-Paragraph 43

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-Publisher OTS

-Name Federal Regulation (FR)

-Number Title 12

-Section 563c.102

-Paragraph 10

-Subparagraph b

-Chapter V

-Subsection I

-LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 35

-Paragraph 17

-URI http://asc.fasb.org/extlink&oid=16397438&loc=d3e1424-110224

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-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-DEP

-Paragraph 6, 20

-IssueDate 2006-05-01

-Chapter 11

-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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