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Loans and ALLL (Summary of information pertaining to impaired loans) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Outstanding Balance $ 6,153   $ 6,411
Impaired loans without a valuation allowance, Outstanding Balance 17,310   20,499
Impaired loans, Outstanding Balance 23,463   26,910
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans with a valuation allowance, Unpaid Principal Balance 6,425   6,683
Impaired loans without a valuation allowance, Unpaid Principal Balance 17,626   20,815
Impaired loans, Unpaid Principal Balance 24,051   27,498
Impaired loans, Valuation Allowance 573   578
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Average Outstanding Balance 6,280 $ 8,894  
Impaired loans without a valuation allowance, Average Outstanding Balance 18,907 22,022  
Impaired loans, Average Outstanding Balance 25,187 30,916  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans with a valuation allowance, Interest Income Recognized 68 82  
Impaired loans without a valuation allowance, Interest Income Recognized 265 334  
Impaired loans, Interest Income Recognized 333 416  
Total commercial [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans, Outstanding Balance 9,072   9,267
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans, Unpaid Principal Balance 9,388   9,584
Impaired loans, Valuation Allowance 9   13
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans, Average Outstanding Balance 9,168 12,059  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans, Interest Income Recognized 129 169  
Commercial real estate [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Outstanding Balance 192   192
Impaired loans without a valuation allowance, Outstanding Balance 5,740   5,829
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans with a valuation allowance, Unpaid Principal Balance 192   193
Impaired loans without a valuation allowance, Unpaid Principal Balance 6,056   6,145
Impaired loans, Valuation Allowance 8   9
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Average Outstanding Balance 189 2,424  
Impaired loans without a valuation allowance, Average Outstanding Balance 5,785 4,907  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans with a valuation allowance, Interest Income Recognized 3 28  
Impaired loans without a valuation allowance, Interest Income Recognized 85 101  
Commercial other [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Outstanding Balance 2,671   2,802
Impaired loans without a valuation allowance, Outstanding Balance 469   444
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans with a valuation allowance, Unpaid Principal Balance 2,671   2,802
Impaired loans without a valuation allowance, Unpaid Principal Balance 469   444
Impaired loans, Valuation Allowance 1   4
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Average Outstanding Balance 2,737 54  
Impaired loans without a valuation allowance, Average Outstanding Balance 457 4,674  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans with a valuation allowance, Interest Income Recognized 30 0  
Impaired loans without a valuation allowance, Interest Income Recognized 11 40  
Total agricultural [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans, Outstanding Balance 11,101   14,189
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans, Unpaid Principal Balance 11,101   14,189
Impaired loans, Valuation Allowance 0   0
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans, Average Outstanding Balance 12,646 14,629  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans, Interest Income Recognized 169 204  
Agricultural real estate [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans without a valuation allowance, Outstanding Balance 7,967   9,538
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans without a valuation allowance, Unpaid Principal Balance 7,967   9,538
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Average Outstanding Balance 0 1,510  
Impaired loans without a valuation allowance, Average Outstanding Balance 8,753 9,418  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans with a valuation allowance, Interest Income Recognized 0 11  
Impaired loans without a valuation allowance, Interest Income Recognized 124 132  
Agricultural other [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans without a valuation allowance, Outstanding Balance 3,134   4,651
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans without a valuation allowance, Unpaid Principal Balance 3,134   4,651
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Average Outstanding Balance 0 678  
Impaired loans without a valuation allowance, Average Outstanding Balance 3,893 3,023  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans with a valuation allowance, Interest Income Recognized 0 0  
Impaired loans without a valuation allowance, Interest Income Recognized 45 61  
Total residential real estate [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans, Outstanding Balance 3,290   3,454
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans, Unpaid Principal Balance 3,562   3,725
Impaired loans, Valuation Allowance 564   565
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans, Average Outstanding Balance 3,373 4,228  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans, Interest Income Recognized 35 43  
Residential real estate senior liens [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Outstanding Balance 3,290   3,417
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans with a valuation allowance, Unpaid Principal Balance 3,562   3,688
Impaired loans, Valuation Allowance 564   565
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Average Outstanding Balance 3,354 4,228  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans with a valuation allowance, Interest Income Recognized 35 43  
Residential real estate home equity lines of credit [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans without a valuation allowance, Outstanding Balance 0   37
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans without a valuation allowance, Unpaid Principal Balance 0   $ 37
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans without a valuation allowance, Average Outstanding Balance 19 0  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans without a valuation allowance, Interest Income Recognized $ 0 $ 0