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Loans, Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
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 $ 888   $ 735      
Collectively evaluated for impairment 13,939   13,110      
Total 14,827 $ 14,247 13,845 $ 13,304 $ 13,084 $ 12,884
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 30   32      
Collectively evaluated for impairment 1,176   1,082      
Total 1,206 1,154 1,114 1,066 1,089 1,105
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 452   251      
Collectively evaluated for impairment 4,492   4,298      
Total 4,944 4,729 4,549 4,400 4,130 4,115
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 77   151      
Collectively evaluated for impairment 4,984   4,871      
Total 5,061 4,878 5,022 4,532 4,392 4,264
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 81   43      
Total 81 56 43 36 32 58
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 362   112      
Total 362 117 112 118 124 120
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 175   147      
Collectively evaluated for impairment 1,026   1,108      
Total 1,201 1,297 1,255 1,328 1,283 1,354
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 154   154      
Collectively evaluated for impairment 667   807      
Total 821 835 961 741 756 752
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 547   536      
Total 547 558 536 539 565 762
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 604   253      
Total $ 604 $ 623 $ 253 $ 544 $ 713 $ 354