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Loans, Credit Quality Indicator (Details) (USD $)
 3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2014
Minimum [Member]
Mar. 31, 2014
Real Estate Loans [Member]
Mortgages [Member]
Dec. 31, 2013
Real Estate Loans [Member]
Mortgages [Member]
Mar. 31, 2014
Real Estate Loans [Member]
Home Equity [Member]
Dec. 31, 2013
Real Estate Loans [Member]
Home Equity [Member]
Mar. 31, 2014
Real Estate Loans [Member]
Commercial [Member]
Dec. 31, 2013
Real Estate Loans [Member]
Commercial [Member]
Mar. 31, 2014
Real Estate Loans [Member]
Agricultural [Member]
Dec. 31, 2013
Real Estate Loans [Member]
Agricultural [Member]
Mar. 31, 2014
Real Estate Loans [Member]
Construction [Member]
Dec. 31, 2013
Real Estate Loans [Member]
Construction [Member]
Mar. 31, 2014
Consumer [Member]
Dec. 31, 2013
Consumer [Member]
Mar. 31, 2014
Other Commercial Loans [Member]
Dec. 31, 2013
Other Commercial Loans [Member]
Mar. 31, 2014
Other Agricultural Loans [Member]
Dec. 31, 2013
Other Agricultural Loans [Member]
Mar. 31, 2014
State and Political Subdivision Loans [Member]
Dec. 31, 2013
State and Political Subdivision Loans [Member]
Mar. 31, 2014
Pass [Member]
Dec. 31, 2013
Pass [Member]
Mar. 31, 2014
Pass [Member]
Real Estate Loans [Member]
Commercial [Member]
Dec. 31, 2013
Pass [Member]
Real Estate Loans [Member]
Commercial [Member]
Mar. 31, 2014
Pass [Member]
Real Estate Loans [Member]
Agricultural [Member]
Dec. 31, 2013
Pass [Member]
Real Estate Loans [Member]
Agricultural [Member]
Mar. 31, 2014
Pass [Member]
Real Estate Loans [Member]
Construction [Member]
Dec. 31, 2013
Pass [Member]
Real Estate Loans [Member]
Construction [Member]
Mar. 31, 2014
Pass [Member]
Other Commercial Loans [Member]
Dec. 31, 2013
Pass [Member]
Other Commercial Loans [Member]
Mar. 31, 2014
Pass [Member]
Other Agricultural Loans [Member]
Dec. 31, 2013
Pass [Member]
Other Agricultural Loans [Member]
Mar. 31, 2014
Pass [Member]
State and Political Subdivision Loans [Member]
Dec. 31, 2013
Pass [Member]
State and Political Subdivision Loans [Member]
Mar. 31, 2014
Special Mention [Member]
Dec. 31, 2013
Special Mention [Member]
Mar. 31, 2014
Special Mention [Member]
Real Estate Loans [Member]
Commercial [Member]
Dec. 31, 2013
Special Mention [Member]
Real Estate Loans [Member]
Commercial [Member]
Mar. 31, 2014
Special Mention [Member]
Real Estate Loans [Member]
Agricultural [Member]
Dec. 31, 2013
Special Mention [Member]
Real Estate Loans [Member]
Agricultural [Member]
Mar. 31, 2014
Special Mention [Member]
Real Estate Loans [Member]
Construction [Member]
Dec. 31, 2013
Special Mention [Member]
Real Estate Loans [Member]
Construction [Member]
Mar. 31, 2014
Special Mention [Member]
Other Commercial Loans [Member]
Dec. 31, 2013
Special Mention [Member]
Other Commercial Loans [Member]
Mar. 31, 2014
Special Mention [Member]
Other Agricultural Loans [Member]
Dec. 31, 2013
Special Mention [Member]
Other Agricultural Loans [Member]
Mar. 31, 2014
Special Mention [Member]
State and Political Subdivision Loans [Member]
Dec. 31, 2013
Special Mention [Member]
State and Political Subdivision Loans [Member]
Mar. 31, 2014
Substandard [Member]
Dec. 31, 2013
Substandard [Member]
Mar. 31, 2014
Substandard [Member]
Real Estate Loans [Member]
Commercial [Member]
Dec. 31, 2013
Substandard [Member]
Real Estate Loans [Member]
Commercial [Member]
Mar. 31, 2014
Substandard [Member]
Real Estate Loans [Member]
Agricultural [Member]
Dec. 31, 2013
Substandard [Member]
Real Estate Loans [Member]
Agricultural [Member]
Mar. 31, 2014
Substandard [Member]
Real Estate Loans [Member]
Construction [Member]
Dec. 31, 2013
Substandard [Member]
Real Estate Loans [Member]
Construction [Member]
Mar. 31, 2014
Substandard [Member]
Other Commercial Loans [Member]
Dec. 31, 2013
Substandard [Member]
Other Commercial Loans [Member]
Mar. 31, 2014
Substandard [Member]
Other Agricultural Loans [Member]
Dec. 31, 2013
Substandard [Member]
Other Agricultural Loans [Member]
Mar. 31, 2014
Substandard [Member]
State and Political Subdivision Loans [Member]
Dec. 31, 2013
Substandard [Member]
State and Political Subdivision Loans [Member]
Mar. 31, 2014
Doubtful [Member]
Dec. 31, 2013
Doubtful [Member]
Mar. 31, 2014
Doubtful [Member]
Real Estate Loans [Member]
Commercial [Member]
Dec. 31, 2013
Doubtful [Member]
Real Estate Loans [Member]
Commercial [Member]
Mar. 31, 2014
Doubtful [Member]
Real Estate Loans [Member]
Agricultural [Member]
Dec. 31, 2013
Doubtful [Member]
Real Estate Loans [Member]
Agricultural [Member]
Mar. 31, 2014
Doubtful [Member]
Real Estate Loans [Member]
Construction [Member]
Dec. 31, 2013
Doubtful [Member]
Real Estate Loans [Member]
Construction [Member]
Mar. 31, 2014
Doubtful [Member]
Other Commercial Loans [Member]
Dec. 31, 2013
Doubtful [Member]
Other Commercial Loans [Member]
Mar. 31, 2014
Doubtful [Member]
Other Agricultural Loans [Member]
Dec. 31, 2013
Doubtful [Member]
Other Agricultural Loans [Member]
Mar. 31, 2014
Doubtful [Member]
State and Political Subdivision Loans [Member]
Dec. 31, 2013
Doubtful [Member]
State and Political Subdivision Loans [Member]
Mar. 31, 2014
Loss [Member]
Dec. 31, 2013
Loss [Member]
Mar. 31, 2014
Loss [Member]
Real Estate Loans [Member]
Commercial [Member]
Dec. 31, 2013
Loss [Member]
Real Estate Loans [Member]
Commercial [Member]
Mar. 31, 2014
Loss [Member]
Real Estate Loans [Member]
Agricultural [Member]
Dec. 31, 2013
Loss [Member]
Real Estate Loans [Member]
Agricultural [Member]
Mar. 31, 2014
Loss [Member]
Real Estate Loans [Member]
Construction [Member]
Dec. 31, 2013
Loss [Member]
Real Estate Loans [Member]
Construction [Member]
Mar. 31, 2014
Loss [Member]
Other Commercial Loans [Member]
Dec. 31, 2013
Loss [Member]
Other Commercial Loans [Member]
Mar. 31, 2014
Loss [Member]
Other Agricultural Loans [Member]
Dec. 31, 2013
Loss [Member]
Other Agricultural Loans [Member]
Mar. 31, 2014
Loss [Member]
State and Political Subdivision Loans [Member]
Dec. 31, 2013
Loss [Member]
State and Political Subdivision Loans [Member]
Mar. 31, 2014
Internally Assigned Grade [Member]
Dec. 31, 2013
Internally Assigned Grade [Member]
Mar. 31, 2014
Performing [Member]
Dec. 31, 2013
Performing [Member]
Mar. 31, 2014
Performing [Member]
Real Estate Loans [Member]
Mortgages [Member]
Dec. 31, 2013
Performing [Member]
Real Estate Loans [Member]
Mortgages [Member]
Mar. 31, 2014
Performing [Member]
Real Estate Loans [Member]
Home Equity [Member]
Dec. 31, 2013
Performing [Member]
Real Estate Loans [Member]
Home Equity [Member]
Mar. 31, 2014
Performing [Member]
Consumer [Member]
Dec. 31, 2013
Performing [Member]
Consumer [Member]
Mar. 31, 2014
Nonperforming [Member]
Dec. 31, 2013
Nonperforming [Member]
Mar. 31, 2014
Nonperforming [Member]
Real Estate Loans [Member]
Mortgages [Member]
Dec. 31, 2013
Nonperforming [Member]
Real Estate Loans [Member]
Mortgages [Member]
Mar. 31, 2014
Nonperforming [Member]
Real Estate Loans [Member]
Home Equity [Member]
Dec. 31, 2013
Nonperforming [Member]
Real Estate Loans [Member]
Home Equity [Member]
Mar. 31, 2014
Nonperforming [Member]
Consumer [Member]
Dec. 31, 2013
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%                                                                                                                                                                                                                    
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 $ 194,960,000 $ 196,664,000   $ 120,997,000 $ 119,884,000 $ 64,907,000 $ 67,217,000 $ 192,785,000 $ 193,087,000 $ 21,245,000 $ 22,001,000 $ 3,510,000 $ 8,937,000 $ 9,056,000 $ 9,563,000 $ 46,013,000 $ 44,488,000 $ 9,455,000 $ 9,541,000 $ 65,255,000 $ 65,894,000 $ 296,810,000 $ 305,939,000 $ 167,432,000 $ 166,956,000 $ 15,574,000 $ 15,923,000 $ 3,510,000 $ 8,937,000 $ 37,586,000 $ 40,798,000 $ 7,453,000 $ 7,431,000 $ 65,255,000 $ 65,894,000 $ 13,284,000 $ 8,455,000 $ 5,399,000 $ 4,645,000 $ 1,556,000 $ 1,910,000 $ 0 $ 0 $ 6,198,000 $ 1,747,000 $ 131,000 $ 153,000 $ 0 $ 0 $ 27,503,000 $ 29,347,000 $ 19,493,000 $ 21,284,000 $ 4,115,000 $ 4,168,000 $ 0 $ 0 $ 2,024,000 $ 1,938,000 $ 1,871,000 $ 1,957,000 $ 0 $ 0 $ 666,000 $ 207,000 $ 461,000 $ 202,000 $ 0 $ 0 $ 0 $ 0 $ 205,000 $ 5,000 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 338,263,000 $ 343,948,000 $ 193,840,000 $ 195,611,000 $ 120,033,000 $ 119,075,000 $ 64,766,000 $ 66,989,000 $ 9,041,000 $ 9,547,000 $ 1,120,000 $ 1,053,000 $ 964,000 $ 809,000 $ 141,000 $ 228,000 $ 15,000 $ 16,000