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Loans, Credit Quality Indicator (Details) - USD ($)
9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Financing Receivable by credit exposure [Abstract]    
Total $ 186,753,000 $ 193,935,000
Minimum [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Percentage of dollar volume of commercial loan portfolio to be reviewed 55.00%  
Amount over which all new loans to be reviewed, minimum $ 1,000,000  
Amount over which all relationships to be reviewed, minimum 1,000,000  
Amount which is 30 days past due to be reviewed for all aggregate loan relationships 750,000  
Real Estate Loans [Member] | Commercial [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 197,775,000 190,945,000
Real Estate Loans [Member] | Agricultural [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 36,156,000 24,639,000
Real Estate Loans [Member] | Construction [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 10,159,000 6,353,000
Real Estate Loans [Member] | Mortgages [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 118,395,000 122,858,000
Real Estate Loans [Member] | Home Equity [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 59,885,000 62,580,000
Consumer [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 8,473,000 8,497,000
Other Commercial Loans [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 52,195,000 47,451,000
Other Agricultural Loans [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 12,517,000 11,065,000
State and Political Subdivision Loans [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 87,454,000 79,717,000
Pass [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 369,400,000 324,932,000
Pass [Member] | Real Estate Loans [Member] | Commercial [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 181,306,000 169,383,000
Pass [Member] | Real Estate Loans [Member] | Agricultural [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 32,326,000 19,575,000
Pass [Member] | Real Estate Loans [Member] | Construction [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 10,123,000 6,353,000
Pass [Member] | Other Commercial Loans [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 46,435,000 40,683,000
Pass [Member] | Other Agricultural Loans [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 11,756,000 9,221,000
Pass [Member] | State and Political Subdivision Loans [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 87,454,000 79,717,000
Special Mention [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 8,326,000 17,482,000
Special Mention [Member] | Real Estate Loans [Member] | Commercial [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 3,860,000 8,948,000
Special Mention [Member] | Real Estate Loans [Member] | Agricultural [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 3,302,000 3,394,000
Special Mention [Member] | Real Estate Loans [Member] | Construction [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 36,000 0
Special Mention [Member] | Other Commercial Loans [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 480,000 4,413,000
Special Mention [Member] | Other Agricultural Loans [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 648,000 727,000
Special Mention [Member] | State and Political Subdivision Loans [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 0 0
Substandard [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 18,356,000 17,756,000
Substandard [Member] | Real Estate Loans [Member] | Commercial [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 12,575,000 12,614,000
Substandard [Member] | Real Estate Loans [Member] | Agricultural [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 528,000 1,670,000
Substandard [Member] | Real Estate Loans [Member] | Construction [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 0 0
Substandard [Member] | Other Commercial Loans [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 5,140,000 2,355,000
Substandard [Member] | Other Agricultural Loans [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 113,000 1,117,000
Substandard [Member] | State and Political Subdivision Loans [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 0 0
Doubtful [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 174,000 0
Doubtful [Member] | Real Estate Loans [Member] | Commercial [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 34,000 0
Doubtful [Member] | Real Estate Loans [Member] | Agricultural [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 0 0
Doubtful [Member] | Real Estate Loans [Member] | Construction [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 0 0
Doubtful [Member] | Other Commercial Loans [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 140,000 0
Doubtful [Member] | Other Agricultural Loans [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 0 0
Doubtful [Member] | State and Political Subdivision Loans [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 0 0
Loss [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 0 0
Loss [Member] | Real Estate Loans [Member] | Commercial [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 0 0
Loss [Member] | Real Estate Loans [Member] | Agricultural [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 0 0
Loss [Member] | Real Estate Loans [Member] | Construction [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 0 0
Loss [Member] | Other Commercial Loans [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 0 0
Loss [Member] | Other Agricultural Loans [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 0 0
Loss [Member] | State and Political Subdivision Loans [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 0 0
Internally Assigned Grade [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 396,256,000 360,170,000
Performing [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 185,498,000 192,708,000
Performing [Member] | Real Estate Loans [Member] | Mortgages [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 117,363,000 121,968,000
Performing [Member] | Real Estate Loans [Member] | Home Equity [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 59,714,000 62,296,000
Performing [Member] | Consumer [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 8,421,000 8,444,000
Nonperforming [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 1,255,000 1,227,000
Nonperforming [Member] | Real Estate Loans [Member] | Mortgages [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 1,032,000 890,000
Nonperforming [Member] | Real Estate Loans [Member] | Home Equity [Member]    
Financing Receivable by credit exposure [Abstract]    
Total 171,000 284,000
Nonperforming [Member] | Consumer [Member]    
Financing Receivable by credit exposure [Abstract]    
Total $ 52,000 $ 53,000