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Loans (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Loans:
Loans - Gross	$ 485,025	$ 501,535
Less: Net deferred loan fees and costs	(197)	(133)
Loans after net deferred loan fees and costs	484,828	501,402
Less: Allowance for loan losses	(5,344)	(5,224)	(5,091)
Loans - Net	479,484	496,178
Commercial Real Estate [Member]
Loans:
Loans - Gross	209,601	199,999
Agricultural Real Estate [Member]
Loans:
Loans - Gross	35,898	40,143
Consumer real estate [Member]
Loans:
Loans - Gross	77,160	80,287
Commercial and Industrial [Member]
Loans:
Loans - Gross	89,779	101,624
Agricultural [Member]
Loans:
Loans - Gross	51,896	57,770
Consumer [Member]
Loans:
Loans - Gross	19,489	20,413
Industrial Development Bonds [Member]
Loans:
Loans - Gross	$ 1,202	$ 1,299

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Loans after net deferred loan fees and costs.

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- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. Excludes amounts for loans and leases covered under loss sharing agreements.

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