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Allowance for Credit Losses - Loan Portfolio Aging (Details) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due $ 27,000 $ 1,741,000
60-89 Days Past Due 213,000 74,000
Greater Than 90 Days Past Due 0 3,999,000
Total Past Due 240,000 5,814,000
Current 395,531,000 422,345,000
Loans 395,771,000 428,159,000
Recorded Investment Greater Than 90 Days Accruing 0 0
Non-accrual 9,695,000 14,434,000
Commercial
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 104,555,000 108,047,000
Commercial | Commercial and industrial
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 0 57,000
60-89 Days Past Due 0 0
Greater Than 90 Days Past Due 0 236,000
Total Past Due 0 293,000
Current 77,956,000 77,796,000
Loans 77,956,000 78,089,000
Recorded Investment Greater Than 90 Days Accruing 0 0
Non-accrual 0 267,000
Commercial | Agricultural land and production
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 0 0
60-89 Days Past Due 0 0
Greater Than 90 Days Past Due 0 0
Total Past Due 0 0
Current 26,599,000 29,958,000
Loans 26,599,000 29,958,000
Recorded Investment Greater Than 90 Days Accruing 0 0
Non-accrual 0 0
Real Estate Portfolio Segment
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 237,938,000 259,241,000
Real Estate Portfolio Segment | Owner occupied
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 0 0
60-89 Days Past Due 213,000 0
Greater Than 90 Days Past Due 0 122,000
Total Past Due 213,000 122,000
Current 114,231,000 113,061,000
Loans 114,444,000 113,183,000
Recorded Investment Greater Than 90 Days Accruing 0 0
Non-accrual 1,575,000 1,372,000
Real Estate Portfolio Segment | Real estate construction and other land loans
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 0 1,532,000
60-89 Days Past Due 0 0
Greater Than 90 Days Past Due 0 0
Total Past Due 0 1,532,000
Current 33,199,000 31,515,000
Loans 33,199,000 33,047,000
Recorded Investment Greater Than 90 Days Accruing 0 0
Non-accrual 6,288,000 6,823,000
Real Estate Portfolio Segment | Commercial real estate
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 0 0
60-89 Days Past Due 0 0
Greater Than 90 Days Past Due 0 3,544,000
Total Past Due 0 3,544,000
Current 53,797,000 58,979,000
Loans 53,797,000 62,523,000
Recorded Investment Greater Than 90 Days Accruing 0 0
Non-accrual 0 3,544,000
Real Estate Portfolio Segment | Agricultural real estate
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 0 0
60-89 Days Past Due 0 0
Greater Than 90 Days Past Due 0 0
Total Past Due 0 0
Current 28,400,000 42,596,000
Loans 28,400,000 42,596,000
Recorded Investment Greater Than 90 Days Accruing 0 0
Non-accrual 0 0
Real Estate Portfolio Segment | Other real estate
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 0 0
60-89 Days Past Due 0 0
Greater Than 90 Days Past Due 0 0
Total Past Due 0 0
Current 8,098,000 7,892,000
Loans 8,098,000 7,892,000
Recorded Investment Greater Than 90 Days Accruing 0 0
Non-accrual 0 0
Consumer
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 53,278,000 60,871,000
Consumer | Equity loans and lines of credit
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 0 123,000
60-89 Days Past Due 0 0
Greater Than 90 Days Past Due 0 97,000
Total Past Due 0 220,000
Current 42,932,000 50,886,000
Loans 42,932,000 51,106,000
Recorded Investment Greater Than 90 Days Accruing 0 0
Non-accrual 1,832,000 2,354,000
Consumer | Consumer and installment
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 27,000 29,000
60-89 Days Past Due 0 74,000
Greater Than 90 Days Past Due 0 0
Total Past Due 27,000 103,000
Current 10,319,000 9,662,000
Loans 10,346,000 9,765,000
Recorded Investment Greater Than 90 Days Accruing 0 0
Non-accrual $ 0 $ 74,000