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Loans and ALLL (Summary of information pertaining to impaired loans) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Outstanding Balance $ 7,966   $ 9,823
Impaired loans without a valuation allowance, Outstanding Balance 25,929   18,113
Impaired loans, Outstanding Balance 33,895   27,936
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans with a valuation allowance, Unpaid Principal Balance 8,274   10,407
Impaired loans without a valuation allowance, Unpaid Principal Balance 26,245   18,237
Impaired loans, Unpaid Principal Balance 34,519   28,644
Impaired loans, Valuation Allowance 1,380   911
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Average Outstanding Balance 8,894 $ 9,857  
Impaired loans without a valuation allowance, Average Outstanding Balance 22,022 18,058  
Impaired loans, Average Outstanding Balance 30,916 27,915  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans with a valuation allowance, Interest Income Recognized 82 132  
Impaired loans without a valuation allowance, Interest Income Recognized 334 146  
Impaired loans, Interest Income Recognized 416 278  
Total commercial [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans, Outstanding Balance 14,300   9,821
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans, Unpaid Principal Balance 14,616   10,137
Impaired loans, Valuation Allowance 587   84
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans, Average Outstanding Balance 12,059 8,233  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans, Interest Income Recognized 169 105  
Commercial real estate [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Outstanding Balance 2,805   2,048
Impaired loans without a valuation allowance, Outstanding Balance 6,807   3,006
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans with a valuation allowance, Unpaid Principal Balance 2,805   2,290
Impaired loans without a valuation allowance, Unpaid Principal Balance 7,123   3,080
Impaired loans, Valuation Allowance 587   79
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Average Outstanding Balance 2,424 821  
Impaired loans without a valuation allowance, Average Outstanding Balance 4,907 4,562  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans with a valuation allowance, Interest Income Recognized 28 25  
Impaired loans without a valuation allowance, Interest Income Recognized 101 59  
Commercial other [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Outstanding Balance 0   107
Impaired loans without a valuation allowance, Outstanding Balance 4,688   4,660
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans with a valuation allowance, Unpaid Principal Balance 0   107
Impaired loans without a valuation allowance, Unpaid Principal Balance 4,688   4,660
Impaired loans, Valuation Allowance 0   5
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Average Outstanding Balance 54 460  
Impaired loans without a valuation allowance, Average Outstanding Balance 4,674 2,390  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans with a valuation allowance, Interest Income Recognized 0 6  
Impaired loans without a valuation allowance, Interest Income Recognized 40 15  
Total agricultural [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans, Outstanding Balance 15,459   13,796
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans, Unpaid Principal Balance 15,509   13,846
Impaired loans, Valuation Allowance 25   56
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans, Average Outstanding Balance 14,629 14,250  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans, Interest Income Recognized 204 112  
Agricultural real estate [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Outstanding Balance 1,025   1,994
Impaired loans without a valuation allowance, Outstanding Balance 10,155   8,681
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans with a valuation allowance, Unpaid Principal Balance 1,075   1,994
Impaired loans without a valuation allowance, Unpaid Principal Balance 10,155   8,731
Impaired loans, Valuation Allowance 25   54
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Average Outstanding Balance 1,510 1,878  
Impaired loans without a valuation allowance, Average Outstanding Balance 9,418 7,782  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans with a valuation allowance, Interest Income Recognized 11 24  
Impaired loans without a valuation allowance, Interest Income Recognized 132 59  
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 4,279   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 4,279   1,766
Impaired loans, Valuation Allowance 0   2
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Average Outstanding Balance 678 1,355  
Impaired loans without a valuation allowance, Average Outstanding Balance 3,023 3,235  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans with a valuation allowance, Interest Income Recognized 0 22  
Impaired loans without a valuation allowance, Interest Income Recognized 61 7  
Total residential real estate [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans, Outstanding Balance 4,136   4,319
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans, Unpaid Principal Balance 4,394   4,661
Impaired loans, Valuation Allowance 768   771
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans, Average Outstanding Balance 4,228 5,430  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans, Interest Income Recognized 43 61  
Residential real estate senior liens [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Outstanding Balance 4,136   4,319
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans with a valuation allowance, Unpaid Principal Balance 4,394   4,661
Impaired loans, Valuation Allowance 768   $ 771
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Average Outstanding Balance 4,228 5,343  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans with a valuation allowance, Interest Income Recognized 43 55  
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 87  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans without a valuation allowance, Interest Income Recognized 0 6  
Total Consumer [Member]      
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans, Average Outstanding Balance 0 2  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans, Interest Income Recognized 0 0  
Consumer secured [Member]      
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans without a valuation allowance, Average Outstanding Balance 0 2  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans without a valuation allowance, Interest Income Recognized $ 0 $ 0