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Loans and Allowance for Credit Losses - Impaired Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2012
Financing Receivable, Impaired [Line Items]        
Recorded Investment, With no related allowance recorded $ 5,296 $ 1,554    
Upaid Principal Balance, With no related allowance recorded 5,884 1,933    
Cash flows expected to be collected at acquisition 1,070 3,715    
Unpaid Principal Balance, With an allowance recorded 1,070 3,784    
Related Allowance 36 307    
Total Recorded Investment 6,366 5,269    
Total Unpaid Principal Balance 6,954 5,717    
Average Recorded Investment, With no related allowance recorded 3,164 4,427 $ 8,965  
Interest Income Recognized, With no related allowance recorded 167 251 310  
Average Recorded Investment, With an allowance recorded 2,618 1,606 3,827  
Interest Income Recognized, With an allowance recorded 36 3 0  
Average Recorded Investment, Total 5,782 6,033 12,792  
Interest Income Recognized, Total 203 254 310  
Forgone interest on nonaccrual loans 210 245 340  
Commercial        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment, With no related allowance recorded 404 157 2,921  
Interest Income Recognized, With no related allowance recorded 0 0 0  
Average Recorded Investment, With an allowance recorded 38 545 243  
Interest Income Recognized, With an allowance recorded 1 3 0  
Commercial | Commercial and industrial        
Financing Receivable, Impaired [Line Items]        
Recorded Investment, With no related allowance recorded 355 447    
Upaid Principal Balance, With no related allowance recorded 553 612    
Cash flows expected to be collected at acquisition 22 40    
Unpaid Principal Balance, With an allowance recorded 22 40    
Related Allowance 1 3    
Average Recorded Investment, With no related allowance recorded 404 115 2,921  
Interest Income Recognized, With no related allowance recorded 0 0 0  
Average Recorded Investment, With an allowance recorded 38 441 243  
Interest Income Recognized, With an allowance recorded 1 3 0  
Commercial | Agricultural land and production        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment, With no related allowance recorded 0 42 0  
Interest Income Recognized, With no related allowance recorded 0 0 0  
Average Recorded Investment, With an allowance recorded 0 104 0  
Interest Income Recognized, With an allowance recorded 0 0 0  
Real Estate        
Financing Receivable, Impaired [Line Items]        
Recorded Investment, With no related allowance recorded 4,795 934    
Upaid Principal Balance, With no related allowance recorded 5,125 1,078    
Cash flows expected to be collected at acquisition   3,304    
Unpaid Principal Balance, With an allowance recorded   3,368    
Related Allowance   241    
Average Recorded Investment, With no related allowance recorded 2,622 3,631 4,186  
Interest Income Recognized, With no related allowance recorded 167 251 310  
Average Recorded Investment, With an allowance recorded 2,340 839 3,240  
Interest Income Recognized, With an allowance recorded 3 0 0  
Real Estate | Owner occupied        
Financing Receivable, Impaired [Line Items]        
Recorded Investment, With no related allowance recorded   107    
Upaid Principal Balance, With no related allowance recorded   111    
Average Recorded Investment, With no related allowance recorded 24 162 770  
Interest Income Recognized, With no related allowance recorded 0 0 231  
Average Recorded Investment, With an allowance recorded 0 120 190  
Interest Income Recognized, With an allowance recorded 0 0 0  
Real Estate | Real estate construction and other land loans        
Financing Receivable, Impaired [Line Items]        
Recorded Investment, With no related allowance recorded 3,023      
Upaid Principal Balance, With no related allowance recorded 3,085      
Cash flows expected to be collected at acquisition   2,222    
Unpaid Principal Balance, With an allowance recorded   2,222    
Related Allowance   79    
Average Recorded Investment, With no related allowance recorded 1,228 2,393 1,266  
Interest Income Recognized, With no related allowance recorded 114 196 79  
Average Recorded Investment, With an allowance recorded 1,827 171 2,297  
Interest Income Recognized, With an allowance recorded 0 0 0  
Real Estate | Commercial real estate        
Financing Receivable, Impaired [Line Items]        
Recorded Investment, With no related allowance recorded 1,772 827    
Upaid Principal Balance, With no related allowance recorded 2,040 967    
Cash flows expected to be collected at acquisition   1,082    
Unpaid Principal Balance, With an allowance recorded   1,146    
Related Allowance   162    
Average Recorded Investment, With no related allowance recorded 1,370 903 1,939  
Interest Income Recognized, With no related allowance recorded 53 55 0  
Average Recorded Investment, With an allowance recorded 470 548 753  
Interest Income Recognized, With an allowance recorded 0 0 0  
Real Estate | Agricultural real estate        
Financing Receivable, Impaired [Line Items]        
Cash flows expected to be collected at acquisition 51      
Unpaid Principal Balance, With an allowance recorded 51      
Related Allowance 1      
Average Recorded Investment, With no related allowance recorded 0 173 211  
Interest Income Recognized, With no related allowance recorded 0 0 0  
Average Recorded Investment, With an allowance recorded 43 0   $ 0
Interest Income Recognized, With an allowance recorded 3 0   $ 0
Consumer        
Financing Receivable, Impaired [Line Items]        
Recorded Investment, With no related allowance recorded   173    
Upaid Principal Balance, With no related allowance recorded   243    
Cash flows expected to be collected at acquisition   371    
Unpaid Principal Balance, With an allowance recorded   376    
Related Allowance   63    
Average Recorded Investment, With no related allowance recorded 138 639 1,858  
Interest Income Recognized, With no related allowance recorded 0 0 0  
Average Recorded Investment, With an allowance recorded 240 222 344  
Interest Income Recognized, With an allowance recorded 32 0 0  
Consumer | Equity loans and lines of credit        
Financing Receivable, Impaired [Line Items]        
Recorded Investment, With no related allowance recorded 146 167    
Upaid Principal Balance, With no related allowance recorded 206 234    
Cash flows expected to be collected at acquisition 997 359    
Unpaid Principal Balance, With an allowance recorded 997 364    
Related Allowance 34 61    
Average Recorded Investment, With no related allowance recorded 132 598 1,858  
Interest Income Recognized, With no related allowance recorded 0 0 0  
Average Recorded Investment, With an allowance recorded 239 203 328  
Interest Income Recognized, With an allowance recorded 32 0 0  
Consumer | Consumer and installment        
Financing Receivable, Impaired [Line Items]        
Recorded Investment, With no related allowance recorded   6    
Upaid Principal Balance, With no related allowance recorded   9    
Cash flows expected to be collected at acquisition   12    
Unpaid Principal Balance, With an allowance recorded   12    
Related Allowance   2    
Average Recorded Investment, With no related allowance recorded 6 41 0  
Interest Income Recognized, With no related allowance recorded 0 0 0  
Average Recorded Investment, With an allowance recorded 1 19 16  
Interest Income Recognized, With an allowance recorded $ 0 $ 0 $ 0