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Loans, Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]            
Individually evaluated for impairment $ 803   $ 676      
Collectively evaluated for impairment 12,501   12,208      
Total 13,304 $ 13,084 12,884 $ 11,941 $ 11,587 $ 11,190
Real Estate Loans [Member] | Residential [Member]            
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]            
Individually evaluated for impairment 23   24      
Collectively evaluated for impairment 1,043   1,081      
Total 1,066 1,089 1,105 1,045 1,077 1,049
Real Estate Loans [Member] | Commercial [Member]            
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]            
Individually evaluated for impairment 333   216      
Collectively evaluated for impairment 4,067   3,899      
Total 4,400 4,130 4,115 3,794 4,006 3,867
Real Estate Loans [Member] | Agricultural [Member]            
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]            
Individually evaluated for impairment 146   84      
Collectively evaluated for impairment 4,386   4,180      
Total 4,532 4,392 4,264 3,673 3,340 3,143
Real Estate Loans [Member] | Construction [Member]            
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 36   58      
Total 36 32 58 44 39 23
Consumer [Member]            
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 118   120      
Total 118 124 120 115 123 124
Other Commercial Loans [Member]            
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]            
Individually evaluated for impairment 143   193      
Collectively evaluated for impairment 1,185   1,161      
Total 1,328 1,283 1,354 1,266 1,273 1,272
Other Agricultural Loans [Member]            
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]            
Individually evaluated for impairment 158   159      
Collectively evaluated for impairment 583   593      
Total 741 756 752 589 532 492
State and Political Subdivision Loans [Member]            
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 539   762      
Total 539 565 762 767 789 816
Unallocated [Member]            
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 544   354      
Total $ 544 $ 713 $ 354 $ 648 $ 408 $ 404