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Allowance for Credit Losses - Loan Portfolio Aging (Details) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due $ 1,130,000 $ 27,000
60-89 Days Past Due 156,000 213,000
Greater Than 90 Days Past Due 4,836,000 0
Total Past Due 6,122,000 240,000
Current 385,150,000 395,531,000
Recorded Investment Greater Than 90 Days Accruing 0 0
Non-accrual 11,015,000 9,695,000
Loans 391,272,000 395,771,000
Commercial
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 101,395,000 104,555,000
Commercial | Commercial and industrial
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 23,000 0
60-89 Days Past Due 0 0
Greater Than 90 Days Past Due 0 0
Total Past Due 23,000 0
Current 75,488,000 77,956,000
Recorded Investment Greater Than 90 Days Accruing 0 0
Non-accrual 1,359,000 0
Loans 75,511,000 77,956,000
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 25,884,000 26,599,000
Recorded Investment Greater Than 90 Days Accruing 0 0
Non-accrual 0 0
Loans 25,884,000 26,599,000
Real Estate Portfolio Segment
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 242,505,000 237,938,000
Real Estate Portfolio Segment | Owner occupied
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 416,000 0
60-89 Days Past Due 0 213,000
Greater Than 90 Days Past Due 0 0
Total Past Due 416,000 213,000
Current 103,607,000 114,231,000
Recorded Investment Greater Than 90 Days Accruing 0 0
Non-accrual 1,542,000 1,575,000
Loans 104,023,000 114,444,000
Real Estate Portfolio Segment | Real estate construction and other land loans
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 670,000 0
60-89 Days Past Due 0 0
Greater Than 90 Days Past Due 4,836,000 0
Total Past Due 5,506,000 0
Current 26,803,000 33,199,000
Recorded Investment Greater Than 90 Days Accruing 0 0
Non-accrual 6,151,000 6,288,000
Loans 32,309,000 33,199,000
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 156,000 0
Greater Than 90 Days Past Due 0 0
Total Past Due 156,000 0
Current 64,399,000 53,797,000
Recorded Investment Greater Than 90 Days Accruing 0 0
Non-accrual 156,000 0
Loans 64,555,000 53,797,000
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 31,727,000 28,400,000
Recorded Investment Greater Than 90 Days Accruing 0 0
Non-accrual 0 0
Loans 31,727,000 28,400,000
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 9,891,000 8,098,000
Recorded Investment Greater Than 90 Days Accruing 0 0
Non-accrual 0 0
Loans 9,891,000 8,098,000
Consumer
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 47,372,000 53,278,000
Consumer | Equity loans and lines of credit
    
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 39,490,000 42,932,000
Recorded Investment Greater Than 90 Days Accruing 0 0
Non-accrual 1,807,000 1,832,000
Loans 39,490,000 42,932,000
Consumer | Consumer and installment
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 21,000 27,000
60-89 Days Past Due 0 0
Greater Than 90 Days Past Due 0 0
Total Past Due 21,000 27,000
Current 7,861,000 10,319,000
Recorded Investment Greater Than 90 Days Accruing 0 0
Non-accrual 0 0
Loans $ 7,882,000 $ 10,346,000