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Loans and ALLL (Summary of information pertaining to impaired loans) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Impaired Financing Receivable, Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Outstanding Balance $ 9,558   $ 9,558   $ 9,823
Impaired loans without a valuation allowance, Outstanding Balance 20,977   20,977   18,113
Impaired loans, Outstanding Balance 30,535   30,535   27,936
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Impaired loans with a valuation allowance, Unpaid Principal Balance 9,880   9,880   10,407
Impaired loans without a valuation allowance, Unpaid Principal Balance 21,293   21,293   18,237
Impaired loans, Unpaid Principal Balance 31,173   31,173   28,644
Impaired loans, Valuation Allowance 1,201   1,201   911
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Average Outstanding Balance 8,763 $ 10,174 8,828 $ 10,014  
Impaired loans without a valuation allowance, Average Outstanding Balance 23,454 16,822 22,738 17,441  
Impaired loans, Average Outstanding Balance 32,217 26,996 31,566 27,455  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans with a valuation allowance, Interest Income Recognized 106 116 188 248  
Impaired loans without a valuation allowance, Interest Income Recognized 291 234 625 380  
Impaired loans, Interest Income Recognized 397 350 813 628  
Total commercial [Member]          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Impaired loans, Outstanding Balance 12,004   12,004   9,821
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Impaired loans, Unpaid Principal Balance 12,320   12,320   10,137
Impaired loans, Valuation Allowance 541   541   84
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans, Average Outstanding Balance 13,153 8,417 12,606 8,323  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans, Interest Income Recognized 174 113 343 218  
Commercial real estate [Member]          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Outstanding Balance 2,556   2,556   2,048
Impaired loans without a valuation allowance, Outstanding Balance 6,004   6,004   3,006
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Impaired loans with a valuation allowance, Unpaid Principal Balance 2,556   2,556   2,290
Impaired loans without a valuation allowance, Unpaid Principal Balance 6,320   6,320   3,080
Impaired loans, Valuation Allowance 533   533   79
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Average Outstanding Balance 2,681 1,085 2,553 951  
Impaired loans without a valuation allowance, Average Outstanding Balance 6,406 4,046 5,656 4,304  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans with a valuation allowance, Interest Income Recognized 35 21 63 46  
Impaired loans without a valuation allowance, Interest Income Recognized 93 60 194 119  
Commercial other [Member]          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Outstanding Balance 3,126   3,126   107
Impaired loans without a valuation allowance, Outstanding Balance 318   318   4,660
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Impaired loans with a valuation allowance, Unpaid Principal Balance 3,126   3,126   107
Impaired loans without a valuation allowance, Unpaid Principal Balance 318   318   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 1,563 460 808 460  
Impaired loans without a valuation allowance, Average Outstanding Balance 2,503 2,826 3,589 2,608  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans with a valuation allowance, Interest Income Recognized 36 0 36 6  
Impaired loans without a valuation allowance, Interest Income Recognized 10 32 50 47  
Total agricultural [Member]          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Impaired loans, Outstanding Balance 14,843   14,843   13,796
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Impaired loans, Unpaid Principal Balance 14,893   14,893   13,846
Impaired loans, Valuation Allowance 3   3   56
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans, Average Outstanding Balance 15,152 13,426 14,890 13,839  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans, Interest Income Recognized 188 189 392 301  
Agricultural real estate [Member]          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Outstanding Balance 188   188   1,994
Impaired loans without a valuation allowance, Outstanding Balance 9,876   9,876   8,681
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Impaired loans with a valuation allowance, Unpaid Principal Balance 238   238   1,994
Impaired loans without a valuation allowance, Unpaid Principal Balance 9,876   9,876   8,731
Impaired loans, Valuation Allowance 3   3   54
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Average Outstanding Balance 607 2,224 1,058 2,051  
Impaired loans without a valuation allowance, Average Outstanding Balance 10,016 7,441 9,717 7,612  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans with a valuation allowance, Interest Income Recognized 0 26 11 50  
Impaired loans without a valuation allowance, Interest Income Recognized 133 87 265 146  
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 4,779   4,779   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 4,779   4,779   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 1,355 339 1,355  
Impaired loans without a valuation allowance, Average Outstanding Balance 4,529 2,406 3,776 2,821  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans with a valuation allowance, Interest Income Recognized 0 20 0 42  
Impaired loans without a valuation allowance, Interest Income Recognized 55 56 116 63  
Total residential real estate [Member]          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Impaired loans, Outstanding Balance 3,688   3,688   4,319
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Impaired loans, Unpaid Principal Balance 3,960   3,960   4,661
Impaired loans, Valuation Allowance 657   657   771
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans, Average Outstanding Balance 3,912 5,151 4,070 5,291  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans, Interest Income Recognized 35 48 78 109  
Residential real estate senior liens [Member]          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Outstanding Balance 3,688   3,688   4,319
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Impaired loans with a valuation allowance, Unpaid Principal Balance 3,960   3,960   4,661
Impaired loans, Valuation Allowance 657   657   $ 771
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Average Outstanding Balance 3,912 5,050 4,070 5,197  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans with a valuation allowance, Interest Income Recognized 35 49 78 104  
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 0 101 0 94  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans without a valuation allowance, Interest Income Recognized 0 (1) 0 5  
Total Consumer [Member]          
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans, Average Outstanding Balance 0 2 0 2  
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 2 0 2  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans without a valuation allowance, Interest Income Recognized $ 0 $ 0 $ 0 $ 0