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Loans, Allowance for Loan Losses by Portfolio Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Balance at beginning of period $ 11,190 $ 8,886
Charge-offs (116) (119)
Recoveries 13 23
Provision 500 615
Balance at end of period 11,587 9,405
Real Estate Loans [Member] | Residential [Member]    
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Balance at beginning of period 1,049 1,064
Charge-offs (15) (45)
Recoveries 0 0
Provision 43 23
Balance at end of period 1,077 1,042
Real Estate Loans [Member] | Commercial [Member]    
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Balance at beginning of period 3,867 3,589
Charge-offs 0 (41)
Recoveries 0 4
Provision 139 113
Balance at end of period 4,006 3,665
Real Estate Loans [Member] | Agricultural [Member]    
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Balance at beginning of period 3,143 1,494
Charge-offs 0 0
Recoveries 0 0
Provision 197 458
Balance at end of period 3,340 1,952
Real Estate Loans [Member] | Construction [Member]    
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Balance at beginning of period 23 47
Charge-offs 0 0
Recoveries 0 0
Provision 16 (1)
Balance at end of period 39 46
Consumer [Member]    
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Balance at beginning of period 124 122
Charge-offs (13) (28)
Recoveries 10 10
Provision 2 19
Balance at end of period 123 123
Other Commercial Loans [Member]    
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Balance at beginning of period 1,272 1,327
Charge-offs (45) 0
Recoveries 3 9
Provision 43 (121)
Balance at end of period 1,273 1,215
Other Agricultural Loans [Member]    
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Balance at beginning of period 492 312
Charge-offs (43) (5)
Recoveries 0 0
Provision 83 (1)
Balance at end of period 532 306
State and Political Subdivision Loans [Member]    
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Balance at beginning of period 816 833
Charge-offs 0 0
Recoveries 0 0
Provision (27) (9)
Balance at end of period 789 824
Unallocated [Member]    
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Balance at beginning of period 404 98
Charge-offs 0 0
Recoveries 0 0
Provision 4 134
Balance at end of period $ 408 $ 232