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Loans and ALLL (Summary of information pertaining to impaired loans) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Impaired Financing Receivable, Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Outstanding Balance $ 6,732   $ 6,732   $ 9,823
Impaired loans without a valuation allowance, Outstanding Balance 22,936   22,936   18,113
Impaired loans, Outstanding Balance 29,668   29,668   27,936
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Impaired loans with a valuation allowance, Unpaid Principal Balance 7,004   7,004   10,407
Impaired loans without a valuation allowance, Unpaid Principal Balance 23,252   23,252   18,237
Impaired loans, Unpaid Principal Balance 30,256   30,256   28,644
Impaired loans, Valuation Allowance 583   583   911
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Average Outstanding Balance 8,146 $ 10,159 8,601 $ 10,064  
Impaired loans without a valuation allowance, Average Outstanding Balance 21,957 17,339 22,478 17,405  
Impaired loans, Average Outstanding Balance 30,103 27,498 31,079 27,469  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans with a valuation allowance, Interest Income Recognized 75 143 263 391  
Impaired loans without a valuation allowance, Interest Income Recognized 301 191 926 571  
Impaired loans, Interest Income Recognized 376 334 1,189 962  
Total commercial [Member]          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Impaired loans, Outstanding Balance 11,563   11,563   9,821
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Impaired loans, Unpaid Principal Balance 11,879   11,879   10,137
Impaired loans, Valuation Allowance 21   21   84
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans, Average Outstanding Balance 11,785 9,794 12,333 8,815  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans, Interest Income Recognized 168 152 511 370  
Commercial real estate [Member]          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Outstanding Balance 197   197   2,048
Impaired loans without a valuation allowance, Outstanding Balance 8,021   8,021   3,006
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Impaired loans with a valuation allowance, Unpaid Principal Balance 197   197   2,290
Impaired loans without a valuation allowance, Unpaid Principal Balance 8,337   8,337   3,080
Impaired loans, Valuation Allowance 13   13   79
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Average Outstanding Balance 1,377 1,564 2,161 1,157  
Impaired loans without a valuation allowance, Average Outstanding Balance 7,013 3,285 6,109 3,964  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans with a valuation allowance, Interest Income Recognized 3 37 66 83  
Impaired loans without a valuation allowance, Interest Income Recognized 121 43 315 162  
Commercial other [Member]          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Outstanding Balance 3,053   3,053   107
Impaired loans without a valuation allowance, Outstanding Balance 292   292   4,660
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Impaired loans with a valuation allowance, Unpaid Principal Balance 3,053   3,053   107
Impaired loans without a valuation allowance, Unpaid Principal Balance 292   292   4,660
Impaired loans, Valuation Allowance 8   8   5
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Average Outstanding Balance 3,090 442 1,569 454  
Impaired loans without a valuation allowance, Average Outstanding Balance 305 4,503 2,494 3,240  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans with a valuation allowance, Interest Income Recognized 35 13 71 19  
Impaired loans without a valuation allowance, Interest Income Recognized 9 59 59 106  
Total agricultural [Member]          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Impaired loans, Outstanding Balance 14,623   14,623   13,796
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Impaired loans, Unpaid Principal Balance 14,623   14,623   13,846
Impaired loans, Valuation Allowance 0   0   56
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans, Average Outstanding Balance 14,733 13,048 14,838 13,574  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans, Interest Income Recognized 171 134 563 435  
Agricultural real estate [Member]          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Outstanding Balance 0   0   1,994
Impaired loans without a valuation allowance, Outstanding Balance 9,814   9,814   8,681
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Impaired loans with a valuation allowance, Unpaid Principal Balance 0   0   1,994
Impaired loans without a valuation allowance, Unpaid Principal Balance 9,814   9,814   8,731
Impaired loans, Valuation Allowance 0   0   54
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Average Outstanding Balance 94 2,198 737 2,100  
Impaired loans without a valuation allowance, Average Outstanding Balance 9,845 7,548 9,760 7,590  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans with a valuation allowance, Interest Income Recognized 0 27 11 77  
Impaired loans without a valuation allowance, Interest Income Recognized 113 68 378 214  
Agricultural other [Member]          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Outstanding Balance 0   0   1,355
Impaired loans without a valuation allowance, Outstanding Balance 4,809   4,809   1,766
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Impaired loans with a valuation allowance, Unpaid Principal Balance 0   0   1,355
Impaired loans without a valuation allowance, Unpaid Principal Balance 4,809   4,809   1,766
Impaired loans, Valuation Allowance 0   0   2
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Average Outstanding Balance 0 1,355 226 1,355  
Impaired loans without a valuation allowance, Average Outstanding Balance 4,794 1,947 4,115 2,529  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans with a valuation allowance, Interest Income Recognized 0 18 0 60  
Impaired loans without a valuation allowance, Interest Income Recognized 58 21 174 84  
Total residential real estate [Member]          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Impaired loans, Outstanding Balance 3,482   3,482   4,319
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Impaired loans, Unpaid Principal Balance 3,754   3,754   4,661
Impaired loans, Valuation Allowance 562   562   771
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans, Average Outstanding Balance 3,585 4,656 3,908 5,079  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans, Interest Income Recognized 37 48 115 157  
Residential real estate senior liens [Member]          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Outstanding Balance 3,482   3,482   4,319
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Impaired loans with a valuation allowance, Unpaid Principal Balance 3,754   3,754   4,661
Impaired loans, Valuation Allowance 562   562   $ 771
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Average Outstanding Balance 3,585 4,600 3,908 4,998  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans with a valuation allowance, Interest Income Recognized 37 48 115 152  
Residential real estate home equity lines of credit [Member]          
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans without a valuation allowance, Average Outstanding Balance 0 56 0 81  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans without a valuation allowance, Interest Income Recognized 0 0 0 5  
Total Consumer [Member]          
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans, Average Outstanding Balance 0 0 0 1  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans, Interest Income Recognized $ 0 $ 0 0 0  
Consumer secured [Member]          
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans without a valuation allowance, Average Outstanding Balance     0 1  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans without a valuation allowance, Interest Income Recognized     $ 0 $ 0