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Loans and Allowance for Loan Losses (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]      
Risk rated loans $ 409,073 $ 398,785 $ 369,000
Nonaccrual past due loans 1,532 1,096  
Agricultural [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Risk rated loans 49,109 48,464 44,614
Nonaccrual past due loans 393 423  
Agricultural [Member] | Risk ratings 1 and 2 [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Risk rated loans 15,300 14,813  
Agricultural [Member] | Risk rating 3 [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Risk rated loans 23,938 22,721  
Agricultural [Member] | Risk rating 4 [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Risk rated loans 9,082 10,199  
Agricultural [Member] | Risk rating 5 [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Risk rated loans 211 308  
Agricultural [Member] | Risk rating 6 [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Risk rated loans 578 423  
Commercial and Industrial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Risk rated loans 91,406 104,386 96,088
Commercial and Industrial [Member] | Risk ratings 1 and 2 [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Risk rated loans 11,972 13,491  
Commercial and Industrial [Member] | Risk rating 3 [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Risk rated loans 50,266 63,366  
Commercial and Industrial [Member] | Risk rating 4 [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Risk rated loans 23,961 26,943  
Commercial and Industrial [Member] | Risk rating 5 [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Risk rated loans 5,204 491  
Commercial and Industrial [Member] | Risk rating 6 [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Risk rated loans 3 95  
Commercial Real Estate [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Risk rated loans 139,453 123,487 110,762
Nonaccrual past due loans 123 222  
Commercial Real Estate [Member] | Risk ratings 1 and 2 [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Risk rated loans 7,962 8,227  
Commercial Real Estate [Member] | Risk rating 3 [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Risk rated loans 89,173 78,868  
Commercial Real Estate [Member] | Risk rating 4 [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Risk rated loans 36,193 33,429  
Commercial Real Estate [Member] | Risk rating 5 [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Risk rated loans 4,850 1,533  
Commercial Real Estate [Member] | Risk rating 6 [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Risk rated loans 1,275 1,430  
Consumer [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Risk rated loans 24,382 24,513 21,596
Nonaccrual past due loans 62 15  
Consumer [Member] | Performing [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Risk rated loans 24,320 24,497  
Consumer [Member] | Nonperforming [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Risk rated loans   1  
Construction Real Estate [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Risk rated loans 8,843 6,613 6,153
Construction Real Estate [Member] | Performing [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Risk rated loans 8,843 6,613  
Residential Real Estate [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Risk rated loans 95,880 91,322 $ 89,787
Nonaccrual past due loans 955 436  
Residential Real Estate [Member] | Performing [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Risk rated loans $ 94,925 90,629  
Residential Real Estate [Member] | Nonperforming [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Risk rated loans   $ 257