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Loans, Credit Quality Indicator (Details) (USD $)
 6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2013
Minimum [Member]
Jun. 30, 2013
Maximum [Member]
Jun. 30, 2013
Real Estate Loans [Member]
Mortgages [Member]
Dec. 31, 2012
Real Estate Loans [Member]
Mortgages [Member]
Jun. 30, 2013
Real Estate Loans [Member]
Home Equity [Member]
Dec. 31, 2012
Real Estate Loans [Member]
Home Equity [Member]
Jun. 30, 2013
Real Estate Loans [Member]
Commercial [Member]
Dec. 31, 2012
Real Estate Loans [Member]
Commercial [Member]
Jun. 30, 2013
Real Estate Loans [Member]
Agricultural [Member]
Dec. 31, 2012
Real Estate Loans [Member]
Agricultural [Member]
Jun. 30, 2013
Real Estate Loans [Member]
Construction [Member]
Dec. 31, 2012
Real Estate Loans [Member]
Construction [Member]
Jun. 30, 2013
Consumer [Member]
Dec. 31, 2012
Consumer [Member]
Jun. 30, 2013
Other Commercial Loans [Member]
Dec. 31, 2012
Other Commercial Loans [Member]
Jun. 30, 2013
Other Agricultural Loans [Member]
Dec. 31, 2012
Other Agricultural Loans [Member]
Jun. 30, 2013
State and Political Subdivision Loans [Member]
Dec. 31, 2012
State and Political Subdivision Loans [Member]
Jun. 30, 2013
Pass [Member]
Dec. 31, 2012
Pass [Member]
Jun. 30, 2013
Pass [Member]
Real Estate Loans [Member]
Commercial [Member]
Dec. 31, 2012
Pass [Member]
Real Estate Loans [Member]
Commercial [Member]
Jun. 30, 2013
Pass [Member]
Real Estate Loans [Member]
Agricultural [Member]
Dec. 31, 2012
Pass [Member]
Real Estate Loans [Member]
Agricultural [Member]
Jun. 30, 2013
Pass [Member]
Real Estate Loans [Member]
Construction [Member]
Dec. 31, 2012
Pass [Member]
Real Estate Loans [Member]
Construction [Member]
Jun. 30, 2013
Pass [Member]
Other Commercial Loans [Member]
Dec. 31, 2012
Pass [Member]
Other Commercial Loans [Member]
Jun. 30, 2013
Pass [Member]
Other Agricultural Loans [Member]
Dec. 31, 2012
Pass [Member]
Other Agricultural Loans [Member]
Jun. 30, 2013
Pass [Member]
State and Political Subdivision Loans [Member]
Dec. 31, 2012
Pass [Member]
State and Political Subdivision Loans [Member]
Jun. 30, 2013
Special Mention [Member]
Dec. 31, 2012
Special Mention [Member]
Jun. 30, 2013
Special Mention [Member]
Real Estate Loans [Member]
Commercial [Member]
Dec. 31, 2012
Special Mention [Member]
Real Estate Loans [Member]
Commercial [Member]
Jun. 30, 2013
Special Mention [Member]
Real Estate Loans [Member]
Agricultural [Member]
Dec. 31, 2012
Special Mention [Member]
Real Estate Loans [Member]
Agricultural [Member]
Jun. 30, 2013
Special Mention [Member]
Real Estate Loans [Member]
Construction [Member]
Dec. 31, 2012
Special Mention [Member]
Real Estate Loans [Member]
Construction [Member]
Jun. 30, 2013
Special Mention [Member]
Other Commercial Loans [Member]
Dec. 31, 2012
Special Mention [Member]
Other Commercial Loans [Member]
Jun. 30, 2013
Special Mention [Member]
Other Agricultural Loans [Member]
Dec. 31, 2012
Special Mention [Member]
Other Agricultural Loans [Member]
Jun. 30, 2013
Special Mention [Member]
State and Political Subdivision Loans [Member]
Dec. 31, 2012
Special Mention [Member]
State and Political Subdivision Loans [Member]
Jun. 30, 2013
Substandard [Member]
Dec. 31, 2012
Substandard [Member]
Jun. 30, 2013
Substandard [Member]
Real Estate Loans [Member]
Commercial [Member]
Dec. 31, 2012
Substandard [Member]
Real Estate Loans [Member]
Commercial [Member]
Jun. 30, 2013
Substandard [Member]
Real Estate Loans [Member]
Agricultural [Member]
Dec. 31, 2012
Substandard [Member]
Real Estate Loans [Member]
Agricultural [Member]
Jun. 30, 2013
Substandard [Member]
Real Estate Loans [Member]
Construction [Member]
Dec. 31, 2012
Substandard [Member]
Real Estate Loans [Member]
Construction [Member]
Jun. 30, 2013
Substandard [Member]
Other Commercial Loans [Member]
Dec. 31, 2012
Substandard [Member]
Other Commercial Loans [Member]
Jun. 30, 2013
Substandard [Member]
Other Agricultural Loans [Member]
Dec. 31, 2012
Substandard [Member]
Other Agricultural Loans [Member]
Jun. 30, 2013
Substandard [Member]
State and Political Subdivision Loans [Member]
Dec. 31, 2012
Substandard [Member]
State and Political Subdivision Loans [Member]
Jun. 30, 2013
Doubtful [Member]
Dec. 31, 2012
Doubtful [Member]
Jun. 30, 2013
Doubtful [Member]
Real Estate Loans [Member]
Commercial [Member]
Dec. 31, 2012
Doubtful [Member]
Real Estate Loans [Member]
Commercial [Member]
Jun. 30, 2013
Doubtful [Member]
Real Estate Loans [Member]
Agricultural [Member]
Dec. 31, 2012
Doubtful [Member]
Real Estate Loans [Member]
Agricultural [Member]
Jun. 30, 2013
Doubtful [Member]
Real Estate Loans [Member]
Construction [Member]
Dec. 31, 2012
Doubtful [Member]
Real Estate Loans [Member]
Construction [Member]
Jun. 30, 2013
Doubtful [Member]
Other Commercial Loans [Member]
Dec. 31, 2012
Doubtful [Member]
Other Commercial Loans [Member]
Jun. 30, 2013
Doubtful [Member]
Other Agricultural Loans [Member]
Dec. 31, 2012
Doubtful [Member]
Other Agricultural Loans [Member]
Jun. 30, 2013
Doubtful [Member]
State and Political Subdivision Loans [Member]
Dec. 31, 2012
Doubtful [Member]
State and Political Subdivision Loans [Member]
Jun. 30, 2013
Loss [Member]
Dec. 31, 2012
Loss [Member]
Jun. 30, 2013
Loss [Member]
Real Estate Loans [Member]
Commercial [Member]
Dec. 31, 2012
Loss [Member]
Real Estate Loans [Member]
Commercial [Member]
Jun. 30, 2013
Loss [Member]
Real Estate Loans [Member]
Agricultural [Member]
Dec. 31, 2012
Loss [Member]
Real Estate Loans [Member]
Agricultural [Member]
Jun. 30, 2013
Loss [Member]
Real Estate Loans [Member]
Construction [Member]
Dec. 31, 2012
Loss [Member]
Real Estate Loans [Member]
Construction [Member]
Jun. 30, 2013
Loss [Member]
Other Commercial Loans [Member]
Dec. 31, 2012
Loss [Member]
Other Commercial Loans [Member]
Jun. 30, 2013
Loss [Member]
Other Agricultural Loans [Member]
Dec. 31, 2012
Loss [Member]
Other Agricultural Loans [Member]
Jun. 30, 2013
Loss [Member]
State and Political Subdivision Loans [Member]
Dec. 31, 2012
Loss [Member]
State and Political Subdivision Loans [Member]
Jun. 30, 2013
Internally Assigned Grade [Member]
Dec. 31, 2012
Internally Assigned Grade [Member]
Jun. 30, 2013
Performing [Member]
Dec. 31, 2012
Performing [Member]
Jun. 30, 2013
Performing [Member]
Real Estate Loans [Member]
Mortgages [Member]
Dec. 31, 2012
Performing [Member]
Real Estate Loans [Member]
Mortgages [Member]
Jun. 30, 2013
Performing [Member]
Real Estate Loans [Member]
Home Equity [Member]
Dec. 31, 2012
Performing [Member]
Real Estate Loans [Member]
Home Equity [Member]
Jun. 30, 2013
Performing [Member]
Consumer [Member]
Dec. 31, 2012
Performing [Member]
Consumer [Member]
Jun. 30, 2013
Nonperforming [Member]
Dec. 31, 2012
Nonperforming [Member]
Jun. 30, 2013
Nonperforming [Member]
Real Estate Loans [Member]
Mortgages [Member]
Dec. 31, 2012
Nonperforming [Member]
Real Estate Loans [Member]
Mortgages [Member]
Jun. 30, 2013
Nonperforming [Member]
Real Estate Loans [Member]
Home Equity [Member]
Dec. 31, 2012
Nonperforming [Member]
Real Estate Loans [Member]
Home Equity [Member]
Jun. 30, 2013
Nonperforming [Member]
Consumer [Member]
Dec. 31, 2012
Nonperforming [Member]
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]                                                                                                                                                                                                                            
Percentage of dollar volume of commercial loan portfolio to be reviewed, minimum (in hundredths)     55.00% 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 $ 190,844,000 $ 188,639,000     $ 111,940,000 $ 106,548,000 $ 68,842,000 $ 71,532,000 $ 178,480,000 $ 176,710,000 $ 19,647,000 $ 18,015,000 $ 13,455,000 $ 12,011,000 $ 10,062,000 $ 10,559,000 $ 44,658,000 $ 41,620,000 $ 9,415,000 $ 6,260,000 $ 59,237,000 $ 59,208,000 $ 289,584,000 $ 277,785,000 $ 152,901,000 $ 149,892,000 $ 15,042,000 $ 13,690,000 $ 13,455,000 $ 12,011,000 $ 41,744,000 $ 39,239,000 $ 7,205,000 $ 4,833,000 $ 59,237,000 $ 58,120,000 $ 10,390,000 $ 11,417,000 $ 6,141,000 $ 7,616,000 $ 2,713,000 $ 2,386,000 $ 0 $ 0 $ 601,000 $ 826,000 $ 935,000 $ 589,000 $ 0 $ 0 $ 24,698,000 $ 24,547,000 $ 19,227,000 $ 19,127,000 $ 1,892,000 $ 1,939,000 $ 0 $ 0 $ 2,304,000 $ 1,555,000 $ 1,275,000 $ 838,000 $ 0 $ 1,088,000 $ 220,000 $ 75,000 $ 211,000 $ 75,000 $ 0 $ 0 $ 0 $ 0 $ 9,000 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 324,892,000 $ 313,824,000 $ 190,134,000 $ 187,640,000 $ 111,395,000 $ 105,822,000 $ 68,677,000 $ 71,263,000 $ 10,062,000 $ 10,555,000 $ 710,000 $ 999,000 $ 545,000 $ 726,000 $ 165,000 $ 269,000 $ 0 $ 4,000