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Allowance for Credit Losses - Loan Portfolio Aging (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due $ 761 $ 1,741
60-89 Days Past Due 0 74
Greater Than 90 Days Past Due 294 3,999
Total Past Due 1,055 5,814
Current 398,667 422,345
Recorded Investment Greater Than 90 Days Accruing 0 0
Non-accrual 10,190 14,434
Loans 399,722 428,159
Commercial
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 113,077 108,047
Commercial | Commercial and industrial
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 0 57
60-89 Days Past Due 0 0
Greater Than 90 Days Past Due 0 236
Total Past Due 0 293
Current 71,439 77,796
Recorded Investment Greater Than 90 Days Accruing 0 0
Non-accrual 0 267
Loans 71,439 78,089
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 41,638 29,958
Recorded Investment Greater Than 90 Days Accruing 0 0
Non-accrual 0 0
Loans 41,638 29,958
Real Estate Portfolio Segment
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 234,185 259,241
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 0 0
Greater Than 90 Days Past Due 294 122
Total Past Due 294 122
Current 108,937 113,061
Recorded Investment Greater Than 90 Days Accruing 0 0
Non-accrual 1,896 1,372
Loans 109,231 113,183
Real Estate Portfolio Segment | Real estate construction and other land loans
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 702 1,532
60-89 Days Past Due 0 0
Greater Than 90 Days Past Due 0 0
Total Past Due 702 1,532
Current 32,532 31,515
Recorded Investment Greater Than 90 Days Accruing 0 0
Non-accrual 6,428 6,823
Loans 33,234 33,047
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
Total Past Due 0 3,544
Current 54,146 58,979
Recorded Investment Greater Than 90 Days Accruing 0 0
Non-accrual 0 3,544
Loans 54,146 62,523
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 29,408 42,596
Recorded Investment Greater Than 90 Days Accruing 0 0
Non-accrual 0 0
Loans 29,408 42,596
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 8,166 7,892
Recorded Investment Greater Than 90 Days Accruing 0 0
Non-accrual 0 0
Loans 8,166 7,892
Consumer
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 52,460 60,871
Consumer | Equity loans and lines of credit
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 0 123
60-89 Days Past Due 0 0
Greater Than 90 Days Past Due 0 97
Total Past Due 0 220
Current 44,335 50,886
Recorded Investment Greater Than 90 Days Accruing 0 0
Non-accrual 1,866 2,354
Loans 44,335 51,106
Consumer | Consumer and installment
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 59 29
60-89 Days Past Due 0 74
Greater Than 90 Days Past Due 0 0
Total Past Due 59 103
Current 8,066 9,662
Recorded Investment Greater Than 90 Days Accruing 0 0
Non-accrual 0 74
Loans $ 8,125 $ 9,765