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Loans, Credit Quality Indicator (Details) (USD $)
 9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2012
Minimum [Member]
Sep. 30, 2012
Real estate loans [Member]
Residential mortgages [Member]
Dec. 31, 2011
Real estate loans [Member]
Residential mortgages [Member]
Sep. 30, 2012
Real estate loans [Member]
Home equity [Member]
Dec. 31, 2011
Real estate loans [Member]
Home equity [Member]
Sep. 30, 2012
Consumer [Member]
Dec. 31, 2011
Consumer [Member]
Sep. 30, 2012
Pass [Member]
Dec. 31, 2011
Pass [Member]
Sep. 30, 2012
Pass [Member]
Real estate loans [Member]
Commercial [Member]
Dec. 31, 2011
Pass [Member]
Real estate loans [Member]
Commercial [Member]
Sep. 30, 2012
Pass [Member]
Real estate loans [Member]
Agricultural [Member]
Dec. 31, 2011
Pass [Member]
Real estate loans [Member]
Agricultural [Member]
Sep. 30, 2012
Pass [Member]
Real estate loans [Member]
Construction [Member]
Dec. 31, 2011
Pass [Member]
Real estate loans [Member]
Construction [Member]
Sep. 30, 2012
Pass [Member]
Other commercial [Member]
Dec. 31, 2011
Pass [Member]
Other commercial [Member]
Sep. 30, 2012
Pass [Member]
State and political subdivision loans [Member]
Dec. 31, 2011
Pass [Member]
State and political subdivision loans [Member]
Sep. 30, 2012
Pass [Member]
Other agricultural loans [Member]
Dec. 31, 2011
Pass [Member]
Other agricultural loans [Member]
Sep. 30, 2012
Special Mention [Member]
Dec. 31, 2011
Special Mention [Member]
Sep. 30, 2012
Special Mention [Member]
Real estate loans [Member]
Commercial [Member]
Dec. 31, 2011
Special Mention [Member]
Real estate loans [Member]
Commercial [Member]
Sep. 30, 2012
Special Mention [Member]
Real estate loans [Member]
Agricultural [Member]
Dec. 31, 2011
Special Mention [Member]
Real estate loans [Member]
Agricultural [Member]
Sep. 30, 2012
Special Mention [Member]
Real estate loans [Member]
Construction [Member]
Dec. 31, 2011
Special Mention [Member]
Real estate loans [Member]
Construction [Member]
Sep. 30, 2012
Special Mention [Member]
Other commercial [Member]
Dec. 31, 2011
Special Mention [Member]
Other commercial [Member]
Sep. 30, 2012
Special Mention [Member]
State and political subdivision loans [Member]
Dec. 31, 2011
Special Mention [Member]
State and political subdivision loans [Member]
Sep. 30, 2012
Special Mention [Member]
Other agricultural loans [Member]
Dec. 31, 2011
Special Mention [Member]
Other agricultural loans [Member]
Sep. 30, 2012
Substandard [Member]
Dec. 31, 2011
Substandard [Member]
Sep. 30, 2012
Substandard [Member]
Real estate loans [Member]
Commercial [Member]
Dec. 31, 2011
Substandard [Member]
Real estate loans [Member]
Commercial [Member]
Sep. 30, 2012
Substandard [Member]
Real estate loans [Member]
Agricultural [Member]
Dec. 31, 2011
Substandard [Member]
Real estate loans [Member]
Agricultural [Member]
Sep. 30, 2012
Substandard [Member]
Real estate loans [Member]
Construction [Member]
Dec. 31, 2011
Substandard [Member]
Real estate loans [Member]
Construction [Member]
Sep. 30, 2012
Substandard [Member]
Other commercial [Member]
Dec. 31, 2011
Substandard [Member]
Other commercial [Member]
Sep. 30, 2012
Substandard [Member]
State and political subdivision loans [Member]
Dec. 31, 2011
Substandard [Member]
State and political subdivision loans [Member]
Sep. 30, 2012
Substandard [Member]
Other agricultural loans [Member]
Dec. 31, 2011
Substandard [Member]
Other agricultural loans [Member]
Sep. 30, 2012
Doubtful [Member]
Dec. 31, 2011
Doubtful [Member]
Sep. 30, 2012
Doubtful [Member]
Real estate loans [Member]
Commercial [Member]
Dec. 31, 2011
Doubtful [Member]
Real estate loans [Member]
Commercial [Member]
Sep. 30, 2012
Doubtful [Member]
Real estate loans [Member]
Agricultural [Member]
Dec. 31, 2011
Doubtful [Member]
Real estate loans [Member]
Agricultural [Member]
Sep. 30, 2012
Doubtful [Member]
Real estate loans [Member]
Construction [Member]
Dec. 31, 2011
Doubtful [Member]
Real estate loans [Member]
Construction [Member]
Sep. 30, 2012
Doubtful [Member]
Other commercial [Member]
Dec. 31, 2011
Doubtful [Member]
Other commercial [Member]
Sep. 30, 2012
Doubtful [Member]
State and political subdivision loans [Member]
Dec. 31, 2011
Doubtful [Member]
State and political subdivision loans [Member]
Sep. 30, 2012
Doubtful [Member]
Other agricultural loans [Member]
Dec. 31, 2011
Doubtful [Member]
Other agricultural loans [Member]
Sep. 30, 2012
Loss [Member]
Dec. 31, 2011
Loss [Member]
Sep. 30, 2012
Loss [Member]
Real estate loans [Member]
Commercial [Member]
Dec. 31, 2011
Loss [Member]
Real estate loans [Member]
Commercial [Member]
Sep. 30, 2012
Loss [Member]
Real estate loans [Member]
Agricultural [Member]
Dec. 31, 2011
Loss [Member]
Real estate loans [Member]
Agricultural [Member]
Sep. 30, 2012
Loss [Member]
Real estate loans [Member]
Construction [Member]
Dec. 31, 2011
Loss [Member]
Real estate loans [Member]
Construction [Member]
Sep. 30, 2012
Loss [Member]
Other commercial [Member]
Dec. 31, 2011
Loss [Member]
Other commercial [Member]
Sep. 30, 2012
Loss [Member]
State and political subdivision loans [Member]
Dec. 31, 2011
Loss [Member]
State and political subdivision loans [Member]
Sep. 30, 2012
Loss [Member]
Other agricultural loans [Member]
Dec. 31, 2011
Loss [Member]
Other agricultural loans [Member]
Sep. 30, 2012
Performing [Member]
Dec. 31, 2011
Performing [Member]
Sep. 30, 2012
Performing [Member]
Real estate loans [Member]
Residential mortgages [Member]
Dec. 31, 2011
Performing [Member]
Real estate loans [Member]
Residential mortgages [Member]
Sep. 30, 2012
Performing [Member]
Real estate loans [Member]
Home equity [Member]
Dec. 31, 2011
Performing [Member]
Real estate loans [Member]
Home equity [Member]
Sep. 30, 2012
Performing [Member]
Consumer [Member]
Dec. 31, 2011
Performing [Member]
Consumer [Member]
Sep. 30, 2012
Nonperforming [Member]
Dec. 31, 2011
Nonperforming [Member]
Sep. 30, 2012
Nonperforming [Member]
Real estate loans [Member]
Residential mortgages [Member]
Dec. 31, 2011
Nonperforming [Member]
Real estate loans [Member]
Residential mortgages [Member]
Sep. 30, 2012
Nonperforming [Member]
Real estate loans [Member]
Home equity [Member]
Dec. 31, 2011
Nonperforming [Member]
Real estate loans [Member]
Home equity [Member]
Sep. 30, 2012
Nonperforming [Member]
Consumer [Member]
Dec. 31, 2011
Nonperforming [Member]
Consumer [Member]
Sep. 30, 2012
Internally Assigned Grade [Member]
Dec. 31, 2011
Internally Assigned Grade [Member]
Sep. 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]
Sep. 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]
Sep. 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]
Sep. 30, 2012
Internally Assigned Grade [Member]
Other commercial [Member]
Dec. 31, 2011
Internally Assigned Grade [Member]
Other commercial [Member]
Sep. 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]
Sep. 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 193,526,000 194,780,000   108,595,000 102,711,000 74,404,000 81,323,000 10,527,000 10,746,000 273,294,000 254,366,000 144,097,000 138,409,000 15,720,000 14,628,000 12,131,000 8,481,000 37,400,000 34,606,000 57,900,000 53,733,000 6,046,000 4,509,000 10,405,000 15,796,000 8,356,000 10,372,000 618,000 2,412,000 0 0 1,161,000 2,203,000 0 0 270,000 809,000 21,911,000 22,550,000 17,080,000 17,045,000 1,962,000 2,184,000 0 0 905,000 921,000 1,108,000 1,166,000 856,000 1,234,000 90,000 17,000 74,000 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 0 192,688,000 194,127,000 108,031,000 102,238,000 74,132,000 81,143,000 10,525,000 10,746,000 838,000 653,000 564,000 473,000 272,000 180,000 2,000 0 305,700,000 292,729,000 169,607,000 165,826,000 18,300,000 19,224,000 12,131,000 8,481,000 39,482,000 37,747,000 59,008,000 54,899,000 7,172,000 6,552,000
Recorded investment based on payment activity [Abstract]                                                                                                                                                                                                                          
Total $ 193,526,000 $ 194,780,000   $ 108,595,000 $ 102,711,000 $ 74,404,000 $ 81,323,000 $ 10,527,000 $ 10,746,000 $ 273,294,000 $ 254,366,000 $ 144,097,000 $ 138,409,000 $ 15,720,000 $ 14,628,000 $ 12,131,000 $ 8,481,000 $ 37,400,000 $ 34,606,000 $ 57,900,000 $ 53,733,000 $ 6,046,000 $ 4,509,000 $ 10,405,000 $ 15,796,000 $ 8,356,000 $ 10,372,000 $ 618,000 $ 2,412,000 $ 0 $ 0 $ 1,161,000 $ 2,203,000 $ 0 $ 0 $ 270,000 $ 809,000 $ 21,911,000 $ 22,550,000 $ 17,080,000 $ 17,045,000 $ 1,962,000 $ 2,184,000 $ 0 $ 0 $ 905,000 $ 921,000 $ 1,108,000 $ 1,166,000 $ 856,000 $ 1,234,000 $ 90,000 $ 17,000 $ 74,000 $ 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 $ 192,688,000 $ 194,127,000 $ 108,031,000 $ 102,238,000 $ 74,132,000 $ 81,143,000 $ 10,525,000 $ 10,746,000 $ 838,000 $ 653,000 $ 564,000 $ 473,000 $ 272,000 $ 180,000 $ 2,000 $ 0 $ 305,700,000 $ 292,729,000 $ 169,607,000 $ 165,826,000 $ 18,300,000 $ 19,224,000 $ 12,131,000 $ 8,481,000 $ 39,482,000 $ 37,747,000 $ 59,008,000 $ 54,899,000 $ 7,172,000 $ 6,552,000