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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Impaired Financing Receivable, Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Outstanding Balance $ 6,009   $ 6,009   $ 6,411
Impaired loans without a valuation allowance, Outstanding Balance 16,973   16,973   20,499
Impaired loans, Outstanding Balance 22,982   22,982   26,910
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Impaired loans with a valuation allowance, Unpaid Principal Balance 6,280   6,280   6,683
Impaired loans without a valuation allowance, Unpaid Principal Balance 17,289   17,289   20,815
Impaired loans, Unpaid Principal Balance 23,569   23,569   27,498
Impaired loans, Valuation Allowance 515   515   578
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Average Outstanding Balance 6,081 $ 8,763 6,182 $ 8,828  
Impaired loans without a valuation allowance, Average Outstanding Balance 17,142 23,454 18,023 22,738  
Impaired loans, Average Outstanding Balance 23,223 32,217 24,205 31,566  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans with a valuation allowance, Interest Income Recognized 66 106 134 188  
Impaired loans without a valuation allowance, Interest Income Recognized 220 291 485 625  
Impaired loans, Interest Income Recognized 286 397 619 813  
Total commercial [Member]          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Impaired loans, Outstanding Balance 8,631   8,631   9,267
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Impaired loans, Unpaid Principal Balance 8,946   8,946   9,584
Impaired loans, Valuation Allowance 27   27   13
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans, Average Outstanding Balance 8,852 13,153 9,011 12,606  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans, Interest Income Recognized 128 174 257 343  
Commercial real estate [Member]          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Outstanding Balance 190   190   192
Impaired loans without a valuation allowance, Outstanding Balance 5,399   5,399   5,829
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Impaired loans with a valuation allowance, Unpaid Principal Balance 189   189   193
Impaired loans without a valuation allowance, Unpaid Principal Balance 5,715   5,715   6,145
Impaired loans, Valuation Allowance 19   19   9
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Average Outstanding Balance 191 2,681 192 2,553  
Impaired loans without a valuation allowance, Average Outstanding Balance 5,570 6,406 5,677 5,656  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans with a valuation allowance, Interest Income Recognized 3 35 6 63  
Impaired loans without a valuation allowance, Interest Income Recognized 89 93 174 194  
Commercial other [Member]          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Outstanding Balance 2,825   2,825   2,802
Impaired loans without a valuation allowance, Outstanding Balance 217   217   444
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Impaired loans with a valuation allowance, Unpaid Principal Balance 2,825   2,825   2,802
Impaired loans without a valuation allowance, Unpaid Principal Balance 217   217   444
Impaired loans, Valuation Allowance 8   8   4
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Average Outstanding Balance 2,748 1,563 2,742 808  
Impaired loans without a valuation allowance, Average Outstanding Balance 343 2,503 400 3,589  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans with a valuation allowance, Interest Income Recognized 32 36 62 36  
Impaired loans without a valuation allowance, Interest Income Recognized 4 10 15 50  
Total agricultural [Member]          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Impaired loans, Outstanding Balance 11,357   11,357   14,189
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Impaired loans, Unpaid Principal Balance 11,357   11,357   14,189
Impaired loans, Valuation Allowance 0   0   0
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans, Average Outstanding Balance 11,229 15,152 11,937 14,890  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans, Interest Income Recognized 127 188 296 392  
Agricultural real estate [Member]          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Impaired loans without a valuation allowance, Outstanding Balance 8,665   8,665   9,538
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Impaired loans without a valuation allowance, Unpaid Principal Balance 8,665   8,665   9,538
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Average Outstanding Balance 0 607 0 1,058  
Impaired loans without a valuation allowance, Average Outstanding Balance 8,316 10,016 8,534 9,717  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans with a valuation allowance, Interest Income Recognized 0 0 0 11  
Impaired loans without a valuation allowance, Interest Income Recognized 101 133 225 265  
Agricultural other [Member]          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Impaired loans without a valuation allowance, Outstanding Balance 2,692   2,692   4,651
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Impaired loans without a valuation allowance, Unpaid Principal Balance 2,692   2,692   4,651
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Average Outstanding Balance     0 339  
Impaired loans without a valuation allowance, Average Outstanding Balance 2,913 4,529 3,403 3,776  
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 26 55 71 116  
Total residential real estate [Member]          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Impaired loans, Outstanding Balance 2,994   2,994   3,454
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Impaired loans, Unpaid Principal Balance 3,266   3,266   3,725
Impaired loans, Valuation Allowance 488   488   565
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans, Average Outstanding Balance 3,142 3,912 3,257 4,070  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans, Interest Income Recognized 31 35 66 78  
Residential real estate senior liens [Member]          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Outstanding Balance 2,994   2,994   3,417
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Impaired loans with a valuation allowance, Unpaid Principal Balance 3,266   3,266   3,688
Impaired loans, Valuation Allowance 488   488   565
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Average Outstanding Balance 3,142 3,912 3,248 4,070  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans with a valuation allowance, Interest Income Recognized 31 $ 35 66 78  
Residential real estate home equity lines of credit [Member]          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Impaired loans without a valuation allowance, Outstanding Balance 0   0   37
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Impaired loans without a valuation allowance, Unpaid Principal Balance $ 0   0   $ 37
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans without a valuation allowance, Average Outstanding Balance     9 0  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans without a valuation allowance, Interest Income Recognized     $ 0 $ 0