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Loans and ALLL (Summary of information pertaining to impaired loans) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Outstanding Balance $ 6,411 $ 9,823
Impaired loans without a valuation allowance, Outstanding Balance 20,499 18,113
Impaired loans, Outstanding Balance 26,910 27,936
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans with a valuation allowance, Unpaid Principal Balance 6,683 10,407
Impaired loans without a valuation allowance, Unpaid Principal Balance 20,815 18,237
Impaired loans, Unpaid Principal Balance 27,498 28,644
Impaired loans, Valuation Allowance 578 911
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Average Outstanding Balance 8,093 10,138
Impaired loans without a valuation allowance, Average Outstanding Balance 22,289 17,536
Impaired loans, Average Outstanding Balance 30,382 27,674
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans with a valuation allowance, Interest Income Recognized 334 519
Impaired loans without a valuation allowance, Interest Income Recognized 1,400 772
Impaired loans, Interest Income Recognized 1,734 1,291
Total commercial [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans, Outstanding Balance 9,267 9,821
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans, Unpaid Principal Balance 9,584 10,137
Impaired loans, Valuation Allowance 13 84
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans, Average Outstanding Balance 11,853 9,257
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans, Interest Income Recognized 638 501
Commercial real estate [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Outstanding Balance 192 2,048
Impaired loans without a valuation allowance, Outstanding Balance 5,829 3,006
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans with a valuation allowance, Unpaid Principal Balance 193 2,290
Impaired loans without a valuation allowance, Unpaid Principal Balance 6,145 3,080
Impaired loans, Valuation Allowance 9 79
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Average Outstanding Balance 1,668 1,384
Impaired loans without a valuation allowance, Average Outstanding Balance 6,313 3,679
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans with a valuation allowance, Interest Income Recognized 69 121
Impaired loans without a valuation allowance, Interest Income Recognized 398 210
Commercial other [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Outstanding Balance 2,802 107
Impaired loans without a valuation allowance, Outstanding Balance 444 4,660
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans with a valuation allowance, Unpaid Principal Balance 2,802 107
Impaired loans without a valuation allowance, Unpaid Principal Balance 444 4,660
Impaired loans, Valuation Allowance 4 5
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Average Outstanding Balance 1,909 464
Impaired loans without a valuation allowance, Average Outstanding Balance 1,963 3,730
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans with a valuation allowance, Interest Income Recognized 103 20
Impaired loans without a valuation allowance, Interest Income Recognized 68 150
Total agricultural [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans, Outstanding Balance 14,189 13,796
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans, Unpaid Principal Balance 14,189 13,846
Impaired loans, Valuation Allowance 0 56
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans, Average Outstanding Balance 14,730 13,519
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans, Interest Income Recognized 945 588
Agricultural real estate [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Outstanding Balance 0 1,994
Impaired loans without a valuation allowance, Outstanding Balance 9,538 8,681
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans with a valuation allowance, Unpaid Principal Balance 0 1,994
Impaired loans without a valuation allowance, Unpaid Principal Balance 9,538 8,731
Impaired loans, Valuation Allowance 0 54
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Average Outstanding Balance 553 2,099
Impaired loans without a valuation allowance, Average Outstanding Balance 9,739 7,704
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans with a valuation allowance, Interest Income Recognized 11 103
Impaired loans without a valuation allowance, Interest Income Recognized 699 302
Agricultural other [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Outstanding Balance 0 1,355
Impaired loans without a valuation allowance, Outstanding Balance 4,651 1,766
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans with a valuation allowance, Unpaid Principal Balance 0 1,355
Impaired loans without a valuation allowance, Unpaid Principal Balance 4,651 1,766
Impaired loans, Valuation Allowance 0 2
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Average Outstanding Balance 169 1,355
Impaired loans without a valuation allowance, Average Outstanding Balance 4,269 2,361
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans with a valuation allowance, Interest Income Recognized 0 78
Impaired loans without a valuation allowance, Interest Income Recognized 235 105
Total residential real estate [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans, Outstanding Balance 3,454 4,319
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans, Unpaid Principal Balance 3,725 4,661
Impaired loans, Valuation Allowance 565 771
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans, Average Outstanding Balance 3,799 4,897
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans, Interest Income Recognized 151 202
Residential real estate senior liens [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Outstanding Balance 3,417 4,319
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans with a valuation allowance, Unpaid Principal Balance 3,688 4,661
Impaired loans, Valuation Allowance 565 771
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Average Outstanding Balance 3,794 4,836
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans with a valuation allowance, Interest Income Recognized 151 197
Residential real estate home equity lines of credit [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans without a valuation allowance, Outstanding Balance 37 0
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans without a valuation allowance, Unpaid Principal Balance 37 0
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans without a valuation allowance, Average Outstanding Balance 5 61
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans without a valuation allowance, Interest Income Recognized $ 0 5
Total consumer [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans, Outstanding Balance   0
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans, Unpaid Principal Balance   0
Impaired loans, Valuation Allowance   0
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans, Average Outstanding Balance   1
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans, Interest Income Recognized   0
Consumer secured [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans without a valuation allowance, Outstanding Balance   0
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans without a valuation allowance, Unpaid Principal Balance   0
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans without a valuation allowance, Average Outstanding Balance   1
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans without a valuation allowance, Interest Income Recognized   $ 0