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Loans and Allowance for Credit Losses - Impaired Loans (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Mar. 31, 2016
Financing Receivable, Impaired [Line Items]            
Recorded Investment, With no related allowance recorded $ 9,264   $ 9,264   $ 5,296  
Unpaid Principal Balance, With no related allowance recorded 9,928   9,928   5,884  
Cash flows expected to be collected at acquisition 1,396   1,396   1,070  
Unpaid Principal Balance, With an allowance recorded 1,397   1,397   1,070  
Related Allowance 211   211   36  
Total Recorded Investment 10,660   10,660   6,366  
Total Unpaid Principal Balance 11,325   11,325   6,954  
Average Recorded Investment, With no related allowance recorded 8,595 $ 3,361 7,405 $ 2,559    
Interest Income Recognized, With no related allowance recorded 154 13 190 27    
Average Recorded Investment, With an allowance recorded 1,295 2,688 1,351 3,052    
Interest Income Recognized, With an allowance recorded 19 33 38 63    
Average Recorded Investment, Total 9,890 6,049 8,756 5,611    
Interest Income Recognized, Total 173 46 228 90    
Forgone interest on nonaccrual loans 89 15 187 105    
Agricultural real estate            
Financing Receivable, Impaired [Line Items]            
Recorded Investment, With no related allowance recorded           $ 3,050
Unpaid Principal Balance, With no related allowance recorded           $ 3,050
Commercial            
Financing Receivable, Impaired [Line Items]            
Recorded Investment, With no related allowance recorded         355  
Unpaid Principal Balance, With no related allowance recorded         553  
Commercial | Commercial and industrial            
Financing Receivable, Impaired [Line Items]            
Recorded Investment, With no related allowance recorded 312   312   355  
Unpaid Principal Balance, With no related allowance recorded 529   529   553  
Cash flows expected to be collected at acquisition 55   55   22  
Unpaid Principal Balance, With an allowance recorded 55   55   22  
Related Allowance 2   2   1  
Average Recorded Investment, With no related allowance recorded 327 418 337 429    
Interest Income Recognized, With no related allowance recorded 0 0 0 0    
Average Recorded Investment, With an allowance recorded 56 23 52 30    
Interest Income Recognized, With an allowance recorded 1 0 2 1    
Real Estate            
Financing Receivable, Impaired [Line Items]            
Recorded Investment, With no related allowance recorded 8,757   8,757   4,795  
Unpaid Principal Balance, With no related allowance recorded 9,176   9,176   5,125  
Cash flows expected to be collected at acquisition 216   216      
Unpaid Principal Balance, With an allowance recorded 217   217      
Related Allowance 166   166      
Average Recorded Investment, With no related allowance recorded 8,071 2,810 6,872 2,004    
Interest Income Recognized, With no related allowance recorded 154 13 190 27    
Average Recorded Investment, With an allowance recorded 216 2,609 283 2,894    
Interest Income Recognized, With an allowance recorded 4 32 7 61    
Real Estate | Owner occupied            
Financing Receivable, Impaired [Line Items]            
Average Recorded Investment, With no related allowance recorded     0 45    
Interest Income Recognized, With no related allowance recorded     0 0    
Real Estate | Commercial real estate            
Financing Receivable, Impaired [Line Items]            
Recorded Investment, With no related allowance recorded 1,713   1,713   1,772  
Unpaid Principal Balance, With no related allowance recorded 2,007   2,007   2,040  
Cash flows expected to be collected at acquisition 165   165      
Unpaid Principal Balance, With an allowance recorded 166   166      
Related Allowance 165   165      
Average Recorded Investment, With no related allowance recorded 1,727 1,332 1,629 1,115    
Interest Income Recognized, With no related allowance recorded 13 13 26 27    
Average Recorded Investment, With an allowance recorded 165 525 232 759    
Interest Income Recognized, With an allowance recorded 3 0 6 0    
Real Estate | Real estate construction and other land loans            
Financing Receivable, Impaired [Line Items]            
Recorded Investment, With no related allowance recorded 2,877   2,877   3,023  
Unpaid Principal Balance, With no related allowance recorded 2,939   2,939   3,085  
Average Recorded Investment, With no related allowance recorded 2,914 1,478 2,951 844    
Interest Income Recognized, With no related allowance recorded 22 0 45 0    
Average Recorded Investment, With an allowance recorded 0 2,026 0 2,101    
Interest Income Recognized, With an allowance recorded 0 31 0 60    
Real Estate | Agricultural real estate            
Financing Receivable, Impaired [Line Items]            
Cash flows expected to be collected at acquisition 51   51   51  
Unpaid Principal Balance, With an allowance recorded 51   51   51  
Related Allowance 1   1   1  
Average Recorded Investment, With no related allowance recorded 2,288 0 1,307 0    
Interest Income Recognized, With no related allowance recorded 119 0 119 0    
Average Recorded Investment, With an allowance recorded 51 58 51 34    
Interest Income Recognized, With an allowance recorded 1 1 1 1    
Real Estate | Other real estate            
Financing Receivable, Impaired [Line Items]            
Recorded Investment, With no related allowance recorded 1,117   1,117      
Unpaid Principal Balance, With no related allowance recorded 1,180   1,180      
Average Recorded Investment, With no related allowance recorded 1,142 0 985 0    
Interest Income Recognized, With no related allowance recorded 0 0 0 0    
Consumer            
Financing Receivable, Impaired [Line Items]            
Cash flows expected to be collected at acquisition 1,125   1,125      
Unpaid Principal Balance, With an allowance recorded 1,125   1,125      
Related Allowance 43   43      
Average Recorded Investment, With no related allowance recorded     196 126    
Interest Income Recognized, With no related allowance recorded     0 0    
Average Recorded Investment, With an allowance recorded 1,023 56 1,016 128    
Interest Income Recognized, With an allowance recorded 14 1 29 1    
Consumer | Equity loans and lines of credit            
Financing Receivable, Impaired [Line Items]            
Recorded Investment, With no related allowance recorded 195   195   146  
Unpaid Principal Balance, With no related allowance recorded 223   223   206  
Cash flows expected to be collected at acquisition 1,113   1,113   997  
Unpaid Principal Balance, With an allowance recorded 1,113   1,113   997  
Related Allowance 31   31   $ 34  
Average Recorded Investment, With no related allowance recorded 197 133 196 124    
Interest Income Recognized, With no related allowance recorded 0 0 0 0    
Average Recorded Investment, With an allowance recorded 1,020 56 1,010 126    
Interest Income Recognized, With an allowance recorded 14 1 29 1    
Consumer | Consumer and installment            
Financing Receivable, Impaired [Line Items]            
Cash flows expected to be collected at acquisition 12   12      
Unpaid Principal Balance, With an allowance recorded 12   12      
Related Allowance 12   12      
Average Recorded Investment, With no related allowance recorded     0 2    
Interest Income Recognized, With no related allowance recorded     0 0    
Average Recorded Investment, With an allowance recorded 3 0 6 2    
Interest Income Recognized, With an allowance recorded $ 0 $ 0 $ 0 $ 0