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Loans, Credit Quality Indicator (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Financing Receivable by credit exposure [Abstract]      
Total $ 217,173   $ 218,428
Minimum [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Percentage of dollar volume of commercial loan portfolio to be reviewed 50.00% 60.00%  
Amount over which all new loans to be reviewed $ 1,000    
Amount over which all relationships to be reviewed 1,000    
Amount which is 30 days past due to be reviewed for all aggregate loan relationships 750    
Real Estate Loans [Member] | Commercial [Member]      
Financing Receivable by credit exposure [Abstract]      
Total 273,624   252,577
Real Estate Loans [Member] | Agricultural [Member]      
Financing Receivable by credit exposure [Abstract]      
Total 207,052   123,624
Real Estate Loans [Member] | Construction [Member]      
Financing Receivable by credit exposure [Abstract]      
Total 17,074   25,441
Real Estate Loans [Member] | Mortgages [Member]      
Financing Receivable by credit exposure [Abstract]      
Total 149,073   148,730
Real Estate Loans [Member] | Home Equity [Member]      
Financing Receivable by credit exposure [Abstract]      
Total 57,316   58,693
Consumer [Member]      
Financing Receivable by credit exposure [Abstract]      
Total 10,784   11,005
Other Commercial Loans [Member]      
Financing Receivable by credit exposure [Abstract]      
Total 56,222   58,639
Other Agricultural Loans [Member]      
Financing Receivable by credit exposure [Abstract]      
Total 34,066   23,388
State and Political Subdivision Loans [Member]      
Financing Receivable by credit exposure [Abstract]      
Total 101,951   97,514
Pass [Member]      
Financing Receivable by credit exposure [Abstract]      
Total 630,331   516,605
Pass [Member] | Real Estate Loans [Member] | Commercial [Member]      
Financing Receivable by credit exposure [Abstract]      
Total 246,405   225,185
Pass [Member] | Real Estate Loans [Member] | Agricultural [Member]      
Financing Receivable by credit exposure [Abstract]      
Total 195,469   110,785
Pass [Member] | Real Estate Loans [Member] | Construction [Member]      
Financing Receivable by credit exposure [Abstract]      
Total 17,074   25,441
Pass [Member] | Other Commercial Loans [Member]      
Financing Receivable by credit exposure [Abstract]      
Total 51,341   51,396
Pass [Member] | Other Agricultural Loans [Member]      
Financing Receivable by credit exposure [Abstract]      
Total 31,791   20,178
Pass [Member] | State and Political Subdivision Loans [Member]      
Financing Receivable by credit exposure [Abstract]      
Total 88,251   83,620
Special Mention [Member]      
Financing Receivable by credit exposure [Abstract]      
Total 23,617   39,124
Special Mention [Member] | Real Estate Loans [Member] | Commercial [Member]      
Financing Receivable by credit exposure [Abstract]      
Total 15,069   14,045
Special Mention [Member] | Real Estate Loans [Member] | Agricultural [Member]      
Financing Receivable by credit exposure [Abstract]      
Total 4,824   8,231
Special Mention [Member] | Real Estate Loans [Member] | Construction [Member]      
Financing Receivable by credit exposure [Abstract]      
Total 0   0
Special Mention [Member] | Other Commercial Loans [Member]      
Financing Receivable by credit exposure [Abstract]      
Total 635   2,049
Special Mention [Member] | Other Agricultural Loans [Member]      
Financing Receivable by credit exposure [Abstract]      
Total 198   1,733
Special Mention [Member] | State and Political Subdivision Loans [Member]      
Financing Receivable by credit exposure [Abstract]      
Total 2,891   13,066
Substandard [Member]      
Financing Receivable by credit exposure [Abstract]      
Total 35,960   25,365
Substandard [Member] | Real Estate Loans [Member] | Commercial [Member]      
Financing Receivable by credit exposure [Abstract]      
Total 12,150   13,347
Substandard [Member] | Real Estate Loans [Member] | Agricultural [Member]      
Financing Receivable by credit exposure [Abstract]      
Total 6,759   4,608
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 4,165   5,105
Substandard [Member] | Other Agricultural Loans [Member]      
Financing Receivable by credit exposure [Abstract]      
Total 2,077   1,477
Substandard [Member] | State and Political Subdivision Loans [Member]      
Financing Receivable by credit exposure [Abstract]      
Total 10,809   828
Doubtful [Member]      
Financing Receivable by credit exposure [Abstract]      
Total 81   89
Doubtful [Member] | Real Estate Loans [Member] | Commercial [Member]      
Financing Receivable by credit exposure [Abstract]      
Total 0   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 81   89
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 689,989   581,183
Performing [Member]      
Financing Receivable by credit exposure [Abstract]      
Total 215,616   216,377
Performing [Member] | Real Estate Loans [Member] | Mortgages [Member]      
Financing Receivable by credit exposure [Abstract]      
Total 147,785   147,047
Performing [Member] | Real Estate Loans [Member] | Home Equity [Member]      
Financing Receivable by credit exposure [Abstract]      
Total 57,148   58,438
Performing [Member] | Consumer [Member]      
Financing Receivable by credit exposure [Abstract]      
Total 10,683   10,892
Nonperforming [Member]      
Financing Receivable by credit exposure [Abstract]      
Total 1,523   2,012
Nonperforming [Member] | Real Estate Loans [Member] | Mortgages [Member]      
Financing Receivable by credit exposure [Abstract]      
Total 1,254   1,648
Nonperforming [Member] | Real Estate Loans [Member] | Home Equity [Member]      
Financing Receivable by credit exposure [Abstract]      
Total 168   255
Nonperforming [Member] | Consumer [Member]      
Financing Receivable by credit exposure [Abstract]      
Total 101   109
PCI [Member]      
Financing Receivable by credit exposure [Abstract]      
Total 34   39
PCI [Member] | Real Estate Loans [Member] | Mortgages [Member]      
Financing Receivable by credit exposure [Abstract]      
Total 34   35
PCI [Member] | Real Estate Loans [Member] | Home Equity [Member]      
Financing Receivable by credit exposure [Abstract]      
Total 0   0
PCI [Member] | Consumer [Member]      
Financing Receivable by credit exposure [Abstract]      
Total $ 0   $ 4