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Loans, Credit Quality Indicator (Details) (USD $)
 6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2012
Minimum [Member]
Jun. 30, 2012
Real estate loans [Member]
Residential mortgages [Member]
Dec. 31, 2011
Real estate loans [Member]
Residential mortgages [Member]
Jun. 30, 2012
Real estate loans [Member]
Home equity [Member]
Dec. 31, 2011
Real estate loans [Member]
Home equity [Member]
Jun. 30, 2012
Consumer [Member]
Dec. 31, 2011
Consumer [Member]
Jun. 30, 2012
Pass [Member]
Dec. 31, 2011
Pass [Member]
Jun. 30, 2012
Pass [Member]
Real estate loans [Member]
Commercial [Member]
Dec. 31, 2011
Pass [Member]
Real estate loans [Member]
Commercial [Member]
Jun. 30, 2012
Pass [Member]
Real estate loans [Member]
Agricultural [Member]
Dec. 31, 2011
Pass [Member]
Real estate loans [Member]
Agricultural [Member]
Jun. 30, 2012
Pass [Member]
Real estate loans [Member]
Construction [Member]
Dec. 31, 2011
Pass [Member]
Real estate loans [Member]
Construction [Member]
Jun. 30, 2012
Pass [Member]
Other commercial [Member]
Dec. 31, 2011
Pass [Member]
Other commercial [Member]
Jun. 30, 2012
Pass [Member]
State and political subdivision loans [Member]
Dec. 31, 2011
Pass [Member]
State and political subdivision loans [Member]
Jun. 30, 2012
Pass [Member]
Other agricultural loans [Member]
Dec. 31, 2011
Pass [Member]
Other agricultural loans [Member]
Jun. 30, 2012
Special Mention [Member]
Dec. 31, 2011
Special Mention [Member]
Jun. 30, 2012
Special Mention [Member]
Real estate loans [Member]
Commercial [Member]
Dec. 31, 2011
Special Mention [Member]
Real estate loans [Member]
Commercial [Member]
Jun. 30, 2012
Special Mention [Member]
Real estate loans [Member]
Agricultural [Member]
Dec. 31, 2011
Special Mention [Member]
Real estate loans [Member]
Agricultural [Member]
Jun. 30, 2012
Special Mention [Member]
Real estate loans [Member]
Construction [Member]
Dec. 31, 2011
Special Mention [Member]
Real estate loans [Member]
Construction [Member]
Jun. 30, 2012
Special Mention [Member]
Other commercial [Member]
Dec. 31, 2011
Special Mention [Member]
Other commercial [Member]
Jun. 30, 2012
Special Mention [Member]
State and political subdivision loans [Member]
Dec. 31, 2011
Special Mention [Member]
State and political subdivision loans [Member]
Jun. 30, 2012
Special Mention [Member]
Other agricultural loans [Member]
Dec. 31, 2011
Special Mention [Member]
Other agricultural loans [Member]
Jun. 30, 2012
Substandard [Member]
Dec. 31, 2011
Substandard [Member]
Jun. 30, 2012
Substandard [Member]
Real estate loans [Member]
Commercial [Member]
Dec. 31, 2011
Substandard [Member]
Real estate loans [Member]
Commercial [Member]
Jun. 30, 2012
Substandard [Member]
Real estate loans [Member]
Agricultural [Member]
Dec. 31, 2011
Substandard [Member]
Real estate loans [Member]
Agricultural [Member]
Jun. 30, 2012
Substandard [Member]
Real estate loans [Member]
Construction [Member]
Dec. 31, 2011
Substandard [Member]
Real estate loans [Member]
Construction [Member]
Jun. 30, 2012
Substandard [Member]
Other commercial [Member]
Dec. 31, 2011
Substandard [Member]
Other commercial [Member]
Jun. 30, 2012
Substandard [Member]
State and political subdivision loans [Member]
Dec. 31, 2011
Substandard [Member]
State and political subdivision loans [Member]
Jun. 30, 2012
Substandard [Member]
Other agricultural loans [Member]
Dec. 31, 2011
Substandard [Member]
Other agricultural loans [Member]
Jun. 30, 2012
Doubtful [Member]
Dec. 31, 2011
Doubtful [Member]
Jun. 30, 2012
Doubtful [Member]
Real estate loans [Member]
Commercial [Member]
Dec. 31, 2011
Doubtful [Member]
Real estate loans [Member]
Commercial [Member]
Jun. 30, 2012
Doubtful [Member]
Real estate loans [Member]
Agricultural [Member]
Dec. 31, 2011
Doubtful [Member]
Real estate loans [Member]
Agricultural [Member]
Jun. 30, 2012
Doubtful [Member]
Real estate loans [Member]
Construction [Member]
Dec. 31, 2011
Doubtful [Member]
Real estate loans [Member]
Construction [Member]
Jun. 30, 2012
Doubtful [Member]
Other commercial [Member]
Dec. 31, 2011
Doubtful [Member]
Other commercial [Member]
Jun. 30, 2012
Doubtful [Member]
State and political subdivision loans [Member]
Dec. 31, 2011
Doubtful [Member]
State and political subdivision loans [Member]
Jun. 30, 2012
Doubtful [Member]
Other agricultural loans [Member]
Dec. 31, 2011
Doubtful [Member]
Other agricultural loans [Member]
Jun. 30, 2012
Loss [Member]
Dec. 31, 2011
Loss [Member]
Jun. 30, 2012
Loss [Member]
Real estate loans [Member]
Commercial [Member]
Dec. 31, 2011
Loss [Member]
Real estate loans [Member]
Commercial [Member]
Jun. 30, 2012
Loss [Member]
Real estate loans [Member]
Agricultural [Member]
Dec. 31, 2011
Loss [Member]
Real estate loans [Member]
Agricultural [Member]
Jun. 30, 2012
Loss [Member]
Real estate loans [Member]
Construction [Member]
Dec. 31, 2011
Loss [Member]
Real estate loans [Member]
Construction [Member]
Jun. 30, 2012
Loss [Member]
Other commercial [Member]
Dec. 31, 2011
Loss [Member]
Other commercial [Member]
Jun. 30, 2012
Loss [Member]
State and political subdivision loans [Member]
Dec. 31, 2011
Loss [Member]
State and political subdivision loans [Member]
Jun. 30, 2012
Loss [Member]
Other agricultural loans [Member]
Dec. 31, 2011
Loss [Member]
Other agricultural loans [Member]
Jun. 30, 2012
Performing [Member]
Dec. 31, 2011
Performing [Member]
Jun. 30, 2012
Performing [Member]
Real estate loans [Member]
Residential mortgages [Member]
Dec. 31, 2011
Performing [Member]
Real estate loans [Member]
Residential mortgages [Member]
Jun. 30, 2012
Performing [Member]
Real estate loans [Member]
Home equity [Member]
Dec. 31, 2011
Performing [Member]
Real estate loans [Member]
Home equity [Member]
Jun. 30, 2012
Performing [Member]
Consumer [Member]
Dec. 31, 2011
Performing [Member]
Consumer [Member]
Jun. 30, 2012
Nonperforming [Member]
Dec. 31, 2011
Nonperforming [Member]
Jun. 30, 2012
Nonperforming [Member]
Real estate loans [Member]
Residential mortgages [Member]
Dec. 31, 2011
Nonperforming [Member]
Real estate loans [Member]
Residential mortgages [Member]
Jun. 30, 2012
Nonperforming [Member]
Real estate loans [Member]
Home equity [Member]
Dec. 31, 2011
Nonperforming [Member]
Real estate loans [Member]
Home equity [Member]
Jun. 30, 2012
Nonperforming [Member]
Consumer [Member]
Dec. 31, 2011
Nonperforming [Member]
Consumer [Member]
Jun. 30, 2012
Internally Assigned Grade [Member]
Dec. 31, 2011
Internally Assigned Grade [Member]
Jun. 30, 2012
Internally Assigned Grade [Member]
Real estate loans [Member]
Commercial [Member]
Dec. 31, 2011
Internally Assigned Grade [Member]
Real estate loans [Member]
Commercial [Member]
Jun. 30, 2012
Internally Assigned Grade [Member]
Real estate loans [Member]
Agricultural [Member]
Dec. 31, 2011
Internally Assigned Grade [Member]
Real estate loans [Member]
Agricultural [Member]
Jun. 30, 2012
Internally Assigned Grade [Member]
Real estate loans [Member]
Construction [Member]
Dec. 31, 2011
Internally Assigned Grade [Member]
Real estate loans [Member]
Construction [Member]
Jun. 30, 2012
Internally Assigned Grade [Member]
Other commercial [Member]
Dec. 31, 2011
Internally Assigned Grade [Member]
Other commercial [Member]
Jun. 30, 2012
Internally Assigned Grade [Member]
State and political subdivision loans [Member]
Dec. 31, 2011
Internally Assigned Grade [Member]
State and political subdivision loans [Member]
Jun. 30, 2012
Internally Assigned Grade [Member]
Other agricultural loans [Member]
Dec. 31, 2011
Internally Assigned Grade [Member]
Other agricultural loans [Member]
Financing Receivable, Recorded Investment [Line Items]                                                                                                                                                                                                                          
Percentage of dollar volume of commercial loan portfolio to be reviewed, minimum (in hundredths)     60.00%                                                                                                                                                                                                                    
Amount over which all relationships to be reviewed, minimum     $ 500,000                                                                                                                                                                                                                    
Amount which is 90 days past due to be reviewed for all aggregate loan relationships, minimum     100,000                                                                                                                                                                                                                    
Financing Receivable by credit exposure [Abstract]                                                                                                                                                                                                                          
Total 192,569,000 194,780,000   105,158,000 102,711,000 76,251,000 81,323,000 11,160,000 10,746,000 267,281,000 254,366,000 141,568,000 138,409,000 16,219,000 14,628,000 10,328,000 8,481,000 36,982,000 34,606,000 56,335,000 53,733,000 5,849,000 4,509,000 13,350,000 15,796,000 10,496,000 10,372,000 623,000 2,412,000 0 0 1,806,000 2,203,000 0 0 425,000 809,000 23,841,000 22,550,000 18,739,000 17,045,000 1,985,000 2,184,000 0 0 1,016,000 921,000 1,128,000 1,166,000 973,000 1,234,000 91,000 17,000 75,000 0 0 0 0 0 16,000 17,000 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 191,840,000 194,127,000 104,600,000 102,238,000 76,080,000 81,143,000 11,160,000 10,746,000 729,000 653,000 558,000 473,000 171,000 180,000 0 0 304,563,000 292,729,000 170,878,000 165,826,000 18,827,000 19,224,000 10,328,000 8,481,000 39,820,000 37,747,000 57,463,000 54,899,000 7,247,000 6,552,000
Recorded investment based on payment activity [Abstract]                                                                                                                                                                                                                          
Total $ 192,569,000 $ 194,780,000   $ 105,158,000 $ 102,711,000 $ 76,251,000 $ 81,323,000 $ 11,160,000 $ 10,746,000 $ 267,281,000 $ 254,366,000 $ 141,568,000 $ 138,409,000 $ 16,219,000 $ 14,628,000 $ 10,328,000 $ 8,481,000 $ 36,982,000 $ 34,606,000 $ 56,335,000 $ 53,733,000 $ 5,849,000 $ 4,509,000 $ 13,350,000 $ 15,796,000 $ 10,496,000 $ 10,372,000 $ 623,000 $ 2,412,000 $ 0 $ 0 $ 1,806,000 $ 2,203,000 $ 0 $ 0 $ 425,000 $ 809,000 $ 23,841,000 $ 22,550,000 $ 18,739,000 $ 17,045,000 $ 1,985,000 $ 2,184,000 $ 0 $ 0 $ 1,016,000 $ 921,000 $ 1,128,000 $ 1,166,000 $ 973,000 $ 1,234,000 $ 91,000 $ 17,000 $ 75,000 $ 0 $ 0 $ 0 $ 0 $ 0 $ 16,000 $ 17,000 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 191,840,000 $ 194,127,000 $ 104,600,000 $ 102,238,000 $ 76,080,000 $ 81,143,000 $ 11,160,000 $ 10,746,000 $ 729,000 $ 653,000 $ 558,000 $ 473,000 $ 171,000 $ 180,000 $ 0 $ 0 $ 304,563,000 $ 292,729,000 $ 170,878,000 $ 165,826,000 $ 18,827,000 $ 19,224,000 $ 10,328,000 $ 8,481,000 $ 39,820,000 $ 37,747,000 $ 57,463,000 $ 54,899,000 $ 7,247,000 $ 6,552,000