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Loans and Allowance for Credit Losses - Impaired Loans (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Sep. 30, 2017
Financing Receivable, Impaired [Line Items]              
Recorded Investment, With no related allowance recorded $ 624 $ 1,114   $ 624   $ 1,114  
Unpaid Principal Balance, With no related allowance recorded 727 1,239   727   1,239  
Cash flows expected to be collected at acquisition 9,436 10,072   9,436   10,072  
Unpaid Principal Balance, With an allowance recorded 9,536 10,132   9,536   10,132  
Related Allowance 931 631   931   631  
Total Recorded Investment 10,060 11,186   10,060   11,186  
Total Unpaid Principal Balance 10,263 11,371   10,263   11,371  
Average Recorded Investment, With no related allowance recorded 861   $ 5,536 918 $ 3,486    
Interest Income Recognized, With no related allowance recorded 3   3 9 9    
Average Recorded Investment, With an allowance recorded 7,768   8,066 9,104 7,818    
Interest Income Recognized, With an allowance recorded 150   167 346 569    
Average Recorded Investment, Total 8,629   13,602 10,022 11,304    
Interest Income Recognized, Total 153   170 355 578    
Forgone interest on nonaccrual loans 30 82   101   135  
Agricultural production              
Financing Receivable, Impaired [Line Items]              
Cash flows expected to be collected at acquisition             $ 779
Unpaid Principal Balance, With an allowance recorded             843
Related Allowance             105
Average Recorded Investment, With an allowance recorded 1,063   778 983 481    
Interest Income Recognized, With an allowance recorded 0   11 0 36    
Commercial              
Financing Receivable, Impaired [Line Items]              
Cash flows expected to be collected at acquisition             8,051
Unpaid Principal Balance, With an allowance recorded             8,150
Related Allowance             $ 877
Average Recorded Investment, With an allowance recorded 6,601   6,218 7,200 6,224    
Interest Income Recognized, With an allowance recorded 129   149 282 518    
Commercial              
Financing Receivable, Impaired [Line Items]              
Average Recorded Investment, With no related allowance recorded       56 1,797    
Interest Income Recognized, With no related allowance recorded       0 0    
Commercial | Commercial and industrial              
Financing Receivable, Impaired [Line Items]              
Recorded Investment, With no related allowance recorded   60       60  
Unpaid Principal Balance, With no related allowance recorded   61       61  
Cash flows expected to be collected at acquisition 7,272 7,342   7,272   7,342  
Unpaid Principal Balance, With an allowance recorded 7,307 7,373   7,307   7,373  
Related Allowance 772 339   772   339  
Average Recorded Investment, With no related allowance recorded 123   4,157 56 1,712    
Interest Income Recognized, With no related allowance recorded 0   0 0 0    
Average Recorded Investment, With an allowance recorded 5,538   5,440 6,217 5,743    
Interest Income Recognized, With an allowance recorded 129   138 282 482    
Commercial | Agricultural production              
Financing Receivable, Impaired [Line Items]              
Average Recorded Investment, With no related allowance recorded       0 85    
Interest Income Recognized, With no related allowance recorded       0 0    
Real Estate              
Financing Receivable, Impaired [Line Items]              
Recorded Investment, With no related allowance recorded   910       910  
Unpaid Principal Balance, With no related allowance recorded   998       998  
Cash flows expected to be collected at acquisition 466 1,706   466   1,706  
Unpaid Principal Balance, With an allowance recorded 467 1,730   467   1,730  
Related Allowance 50 271   50   271  
Average Recorded Investment, With no related allowance recorded 599   1,201 721 1,452    
Interest Income Recognized, With no related allowance recorded 0   0 0 0    
Average Recorded Investment, With an allowance recorded 245   834 958 530    
Interest Income Recognized, With an allowance recorded 7   4 24 10    
Real Estate | Owner occupied              
Financing Receivable, Impaired [Line Items]              
Recorded Investment, With no related allowance recorded   370       370  
Unpaid Principal Balance, With no related allowance recorded   409       409  
Average Recorded Investment, With no related allowance recorded 0   385 72 400    
Interest Income Recognized, With no related allowance recorded 0   0 0 0    
Real Estate | Commercial real estate              
Financing Receivable, Impaired [Line Items]              
Recorded Investment, With no related allowance recorded 486 512   486   512  
Unpaid Principal Balance, With no related allowance recorded 553 561   553   561  
Cash flows expected to be collected at acquisition 140 148   140   148  
Unpaid Principal Balance, With an allowance recorded 141 149   141   149  
Related Allowance 3 3   3   3  
Average Recorded Investment, With no related allowance recorded 365   689 446 860    
Interest Income Recognized, With no related allowance recorded 0   0 0 0    
Average Recorded Investment, With an allowance recorded 141   150 144 223    
Interest Income Recognized, With an allowance recorded 2   3 7 8    
Real Estate | Real estate construction and other land loans              
Financing Receivable, Impaired [Line Items]              
Recorded Investment, With no related allowance recorded   28       28  
Unpaid Principal Balance, With no related allowance recorded   28       28  
Cash flows expected to be collected at acquisition 305 1,528   305   1,528  
Unpaid Principal Balance, With an allowance recorded 305 1,552   305   1,552  
Related Allowance 42 268   42   268  
Average Recorded Investment, With no related allowance recorded 234   7 203 3    
Interest Income Recognized, With no related allowance recorded 0   0 0 0    
Average Recorded Investment, With an allowance recorded 76   656 785 281    
Interest Income Recognized, With an allowance recorded 5   0 16 0    
Real Estate | Agricultural real estate              
Financing Receivable, Impaired [Line Items]              
Cash flows expected to be collected at acquisition 21 30   21   30  
Unpaid Principal Balance, With an allowance recorded 21 29   21   29  
Related Allowance 5 0   5   0  
Average Recorded Investment, With no related allowance recorded 0   120 0 189    
Interest Income Recognized, With no related allowance recorded 0   0 0 0    
Average Recorded Investment, With an allowance recorded 28   28 29 26    
Interest Income Recognized, With an allowance recorded 0   1 1 2    
Consumer              
Financing Receivable, Impaired [Line Items]              
Cash flows expected to be collected at acquisition   1,024       1,024  
Unpaid Principal Balance, With an allowance recorded   1,029       1,029  
Related Allowance   21       21  
Average Recorded Investment, With an allowance recorded 922   1,014 946 1,064    
Interest Income Recognized, With an allowance recorded 14   14 40 41    
Consumer | Equity loans and lines of credit              
Financing Receivable, Impaired [Line Items]              
Recorded Investment, With no related allowance recorded 138 144   138   144  
Unpaid Principal Balance, With no related allowance recorded 174 180   174   180  
Cash flows expected to be collected at acquisition 919 936   919   936  
Unpaid Principal Balance, With an allowance recorded 919 936   919   936  
Related Allowance 4 9   4   9  
Average Recorded Investment, With no related allowance recorded 139   178 141 237    
Interest Income Recognized, With no related allowance recorded 3   3 9 9    
Average Recorded Investment, With an allowance recorded 922   944 928 1,019    
Interest Income Recognized, With an allowance recorded 14   14 40 41    
Consumer | Consumer and installment              
Financing Receivable, Impaired [Line Items]              
Cash flows expected to be collected at acquisition   88       88  
Unpaid Principal Balance, With an allowance recorded   93       93  
Related Allowance   $ 12       $ 12  
Average Recorded Investment, With an allowance recorded 0   70 18 45    
Interest Income Recognized, With an allowance recorded $ 0   $ 0 $ 0 $ 0