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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Impaired Financing Receivable, Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Outstanding Balance $ 9,415   $ 9,415   $ 8,782
Impaired loans without a valuation allowance, Outstanding Balance 16,937   16,937   19,409
Impaired loans, Outstanding Balance 26,352   26,352   28,191
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Impaired loans with a valuation allowance, Unpaid Principal Balance 10,135   10,135   9,329
Impaired loans without a valuation allowance, Unpaid Principal Balance 17,011   17,011   20,022
Impaired loans, Unpaid Principal Balance 27,146   27,146   29,351
Impaired loans, Valuation Allowance 950   950   1,114
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Average Outstanding Balance 10,174 $ 10,551 10,014 $ 10,550  
Impaired loans without a valuation allowance, Average Outstanding Balance 16,822 18,918 17,441 19,468  
Impaired loans, Average Outstanding Balance 26,996 29,469 27,455 30,018  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans with a valuation allowance, Interest Income Recognized 116 92 248 215  
Impaired loans without a valuation allowance, Interest Income Recognized 234 178 380 335  
Impaired loans, Interest Income Recognized 350 270 628 550  
Total commercial [Member]          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Impaired loans, Outstanding Balance 8,235   8,235   7,865
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Impaired loans, Unpaid Principal Balance 8,551   8,551   8,246
Impaired loans, Valuation Allowance 63   63   15
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans, Average Outstanding Balance 8,417 9,244 8,323 9,460  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans, Interest Income Recognized 113 41 218 164  
Commercial real estate [Member]          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Outstanding Balance 1,045   1,045   517
Impaired loans without a valuation allowance, Outstanding Balance 3,930   3,930   4,961
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Impaired loans with a valuation allowance, Unpaid Principal Balance 1,287   1,287   635
Impaired loans without a valuation allowance, Unpaid Principal Balance 4,004   4,004   5,224
Impaired loans, Valuation Allowance 63   63   15
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Average Outstanding Balance 1,085 2,497 951 2,952  
Impaired loans without a valuation allowance, Average Outstanding Balance 4,046 3,985 4,304 3,636  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans with a valuation allowance, Interest Income Recognized 21 7 46 56  
Impaired loans without a valuation allowance, Interest Income Recognized 60 21 119 74  
Commercial other [Member]          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Impaired loans without a valuation allowance, Outstanding Balance 3,260   3,260   2,387
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Impaired loans without a valuation allowance, Unpaid Principal Balance 3,260   3,260   2,387
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Average Outstanding Balance 460 11 460 11  
Impaired loans without a valuation allowance, Average Outstanding Balance 2,826 2,751 2,608 2,861  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans with a valuation allowance, Interest Income Recognized 0 0 6 0  
Impaired loans without a valuation allowance, Interest Income Recognized 32 13 47 34  
Total agricultural [Member]          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Impaired loans, Outstanding Balance 13,191   13,191   14,840
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Impaired loans, Unpaid Principal Balance 13,241   13,241   14,890
Impaired loans, Valuation Allowance 63   63   26
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans, Average Outstanding Balance 13,426 13,732 13,839 13,939  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans, Interest Income Recognized 189 210 301 293  
Agricultural real estate [Member]          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Outstanding Balance 2,201   2,201   1,509
Impaired loans without a valuation allowance, Outstanding Balance 7,689   7,689   8,372
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Impaired loans with a valuation allowance, Unpaid Principal Balance 2,251   2,251   1,509
Impaired loans without a valuation allowance, Unpaid Principal Balance 7,689   7,689   8,422
Impaired loans, Valuation Allowance 61   61   12
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Average Outstanding Balance 2,224 951 2,051 671  
Impaired loans without a valuation allowance, Average Outstanding Balance 7,441 7,307 7,612 7,465  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans with a valuation allowance, Interest Income Recognized 26 57 50 63  
Impaired loans without a valuation allowance, Interest Income Recognized 87 58 146 65  
Agricultural other [Member]          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Outstanding Balance 1,355   1,355   1,355
Impaired loans without a valuation allowance, Outstanding Balance 1,946   1,946   3,604
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Impaired loans with a valuation allowance, Unpaid Principal Balance 1,355   1,355   1,355
Impaired loans without a valuation allowance, Unpaid Principal Balance 1,946   1,946   3,604
Impaired loans, Valuation Allowance 2   2   14
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Average Outstanding Balance 1,355 641 1,355 343  
Impaired loans without a valuation allowance, Average Outstanding Balance 2,406 4,833 2,821 5,460  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans with a valuation allowance, Interest Income Recognized 20 9 42 9  
Impaired loans without a valuation allowance, Interest Income Recognized 56 86 63 156  
Total residential real estate [Member]          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Impaired loans, Outstanding Balance 4,926   4,926   5,486
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Impaired loans, Unpaid Principal Balance 5,354   5,354   6,215
Impaired loans, Valuation Allowance 824   824   1,073
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans, Average Outstanding Balance 5,151 6,485 5,291 6,611  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans, Interest Income Recognized 48 19 109 93  
Residential real estate senior liens [Member]          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Outstanding Balance 4,814   4,814   5,401
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Impaired loans with a valuation allowance, Unpaid Principal Balance 5,242   5,242   5,830
Impaired loans, Valuation Allowance 824   824   1,073
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Average Outstanding Balance 5,050 6,439 5,197 6,561  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans with a valuation allowance, Interest Income Recognized 49 19 104 87  
Residential real estate junior liens [Member]          
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Average Outstanding Balance 0 12 0 12  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans with a valuation allowance, Interest Income Recognized 0 0 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 112   112   85
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Impaired loans without a valuation allowance, Unpaid Principal Balance 112   112   $ 385
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans without a valuation allowance, Average Outstanding Balance 101 34 94 38  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans without a valuation allowance, Interest Income Recognized (1) 0 5 6  
Total Consumer [Member]          
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans, Average Outstanding Balance 2 8 2 8  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans, Interest Income Recognized 0 0 0 0  
Consumer secured [Member]          
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans without a valuation allowance, Average Outstanding Balance 2 8 2 8  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans without a valuation allowance, Interest Income Recognized $ 0 $ 0 $ 0 $ 0