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Loans and ALLL (Summary of information pertaining to impaired loans) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Outstanding Balance $ 10,931   $ 8,782
Impaired loans without a valuation allowance, Outstanding Balance 16,704   19,409
Impaired loans, Outstanding Balance 27,635   28,191
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans with a valuation allowance, Unpaid Principal Balance 11,651   9,329
Impaired loans without a valuation allowance, Unpaid Principal Balance 17,143   20,022
Impaired loans, Unpaid Principal Balance 28,794   29,351
Impaired loans, Valuation Allowance 1,309   1,114
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Average Outstanding Balance 9,857 $ 10,549  
Impaired loans without a valuation allowance, Average Outstanding Balance 18,058 20,019  
Impaired loans, Average Outstanding Balance 27,915 30,568  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans with a valuation allowance, Interest Income Recognized 132 123  
Impaired loans without a valuation allowance, Interest Income Recognized 146 157  
Impaired loans, Interest Income Recognized 278 280  
Total commercial [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans, Outstanding Balance 8,598   7,865
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans, Unpaid Principal Balance 8,979   8,246
Impaired loans, Valuation Allowance 179   15
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans, Average Outstanding Balance 8,233 9,678  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans, Interest Income Recognized 105 123  
Commercial real estate [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Outstanding Balance 1,125   517
Impaired loans without a valuation allowance, Outstanding Balance 4,162   4,961
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans with a valuation allowance, Unpaid Principal Balance 1,367   635
Impaired loans without a valuation allowance, Unpaid Principal Balance 4,301   5,224
Impaired loans, Valuation Allowance 66   15
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Average Outstanding Balance 821 3,409  
Impaired loans without a valuation allowance, Average Outstanding Balance 4,562 3,287  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans with a valuation allowance, Interest Income Recognized 25 49  
Impaired loans without a valuation allowance, Interest Income Recognized 59 53  
Commercial other [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Outstanding Balance 919   0
Impaired loans without a valuation allowance, Outstanding Balance 2,392   2,387
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans with a valuation allowance, Unpaid Principal Balance 919   0
Impaired loans without a valuation allowance, Unpaid Principal Balance 2,392   2,387
Impaired loans, Valuation Allowance 113   0
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Average Outstanding Balance 460 12  
Impaired loans without a valuation allowance, Average Outstanding Balance 2,390 2,970  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans with a valuation allowance, Interest Income Recognized 6 0  
Impaired loans without a valuation allowance, Interest Income Recognized 15 21  
Total agricultural [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans, Outstanding Balance 13,660   14,840
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans, Unpaid Principal Balance 13,710   14,890
Impaired loans, Valuation Allowance 78   26
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans, Average Outstanding Balance 14,250 14,144  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans, Interest Income Recognized 112 83  
Agricultural real estate [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Outstanding Balance 2,247   1,509
Impaired loans without a valuation allowance, Outstanding Balance 7,192   8,372
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans with a valuation allowance, Unpaid Principal Balance 2,297   1,509
Impaired loans without a valuation allowance, Unpaid Principal Balance 7,192   8,422
Impaired loans, Valuation Allowance 70   12
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Average Outstanding Balance 1,878 390  
Impaired loans without a valuation allowance, Average Outstanding Balance 7,782 7,623  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans with a valuation allowance, Interest Income Recognized 24 6  
Impaired loans without a valuation allowance, Interest Income Recognized 59 7  
Agricultural other [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Outstanding Balance 1,355   1,355
Impaired loans without a valuation allowance, Outstanding Balance 2,866   3,604
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans with a valuation allowance, Unpaid Principal Balance 1,355   1,355
Impaired loans without a valuation allowance, Unpaid Principal Balance 2,866   3,604
Impaired loans, Valuation Allowance 8   14
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Average Outstanding Balance 1,355 44  
Impaired loans without a valuation allowance, Average Outstanding Balance 3,235 6,087  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans with a valuation allowance, Interest Income Recognized 22 0  
Impaired loans without a valuation allowance, Interest Income Recognized 7 70  
Total residential real estate [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans, Outstanding Balance 5,374   5,486
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans, Unpaid Principal Balance 6,102   6,215
Impaired loans, Valuation Allowance 1,052   1,073
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans, Average Outstanding Balance 5,430 6,737  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans, Interest Income Recognized 61 74  
Residential real estate senior liens [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Outstanding Balance 5,285   5,401
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans with a valuation allowance, Unpaid Principal Balance 5,713   5,830
Impaired loans, Valuation Allowance 1,052   1,073
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Average Outstanding Balance 5,343 6,682  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans with a valuation allowance, Interest Income Recognized 55 68  
Residential real estate junior liens [Member]      
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Average Outstanding Balance 0 12  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans with a valuation allowance, Interest Income Recognized 0 0  
Residential real estate home equity lines of credit [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans without a valuation allowance, Outstanding Balance 89   85
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans without a valuation allowance, Unpaid Principal Balance 389   385
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans without a valuation allowance, Average Outstanding Balance 87 43  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans without a valuation allowance, Interest Income Recognized 6 6  
Total Consumer [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans, Outstanding Balance 3   0
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans, Unpaid Principal Balance 3   0
Impaired loans, Valuation Allowance 0   0
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans, Average Outstanding Balance 2 9  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans, Interest Income Recognized 0 0  
Consumer secured [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans without a valuation allowance, Outstanding Balance 3   0
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans without a valuation allowance, Unpaid Principal Balance 3   $ 0
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans without a valuation allowance, Average Outstanding Balance 2 9  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans without a valuation allowance, Interest Income Recognized $ 0 $ 0