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Loans and ALLL (Summary of information pertaining to impaired loans) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Outstanding Balance $ 8,782 $ 11,263
Impaired loans without a valuation allowance, Outstanding Balance 19,409 19,836
Impaired loans, Outstanding Balance 28,191 31,099
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans with a valuation allowance, Unpaid Principal Balance 9,329 11,960
Impaired loans without a valuation allowance, Unpaid Principal Balance 20,022 20,439
Impaired loans, Unpaid Principal Balance 29,351 32,399
Impaired loans, Valuation Allowance 1,114 1,938
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Average Outstanding Balance 10,198 13,973
Impaired loans without a valuation allowance, Average Outstanding Balance 19,034 16,532
Impaired loans, Average Outstanding Balance 29,232 30,505
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans with a valuation allowance, Interest Income Recognized 330 406
Impaired loans without a valuation allowance, Interest Income Recognized 572 986
Impaired loans, Interest Income Recognized 902 1,392
Total commercial [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans, Outstanding Balance 7,865 9,899
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans, Unpaid Principal Balance 8,246 10,401
Impaired loans, Valuation Allowance 15 443
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans, Average Outstanding Balance 8,998 9,890
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans, Interest Income Recognized 198 301
Commercial real estate [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Outstanding Balance 517 3,969
Impaired loans without a valuation allowance, Outstanding Balance 4,961 2,794
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans with a valuation allowance, Unpaid Principal Balance 635 4,211
Impaired loans without a valuation allowance, Unpaid Principal Balance 5,224 2,947
Impaired loans, Valuation Allowance 15 437
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Average Outstanding Balance 2,044 4,589
Impaired loans without a valuation allowance, Average Outstanding Balance 4,247 2,728
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans with a valuation allowance, Interest Income Recognized 61 129
Impaired loans without a valuation allowance, Interest Income Recognized 91 74
Commercial other [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Outstanding Balance 0 12
Impaired loans without a valuation allowance, Outstanding Balance 2,387 3,124
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans with a valuation allowance, Unpaid Principal Balance 0 12
Impaired loans without a valuation allowance, Unpaid Principal Balance 2,387 3,231
Impaired loans, Valuation Allowance 0 6
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Average Outstanding Balance 10 1,040
Impaired loans without a valuation allowance, Average Outstanding Balance 2,697 1,533
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans with a valuation allowance, Interest Income Recognized 0 55
Impaired loans without a valuation allowance, Interest Income Recognized 46 43
Total agricultural [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans, Outstanding Balance 14,840 14,298
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans, Unpaid Principal Balance 14,890 14,341
Impaired loans, Valuation Allowance 26 132
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans, Average Outstanding Balance 13,950 12,969
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans, Interest Income Recognized 584 960
Agricultural real estate [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Outstanding Balance 1,509 392
Impaired loans without a valuation allowance, Outstanding Balance 8,372 7,618
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans with a valuation allowance, Unpaid Principal Balance 1,509 392
Impaired loans without a valuation allowance, Unpaid Principal Balance 8,422 7,618
Impaired loans, Valuation Allowance 12 112
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Average Outstanding Balance 1,091 606
Impaired loans without a valuation allowance, Average Outstanding Balance 7,404 7,559
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans with a valuation allowance, Interest Income Recognized 100 50
Impaired loans without a valuation allowance, Interest Income Recognized 171 585
Agricultural other [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Outstanding Balance 1,355 44
Impaired loans without a valuation allowance, Outstanding Balance 3,604 6,244
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans with a valuation allowance, Unpaid Principal Balance 1,355 44
Impaired loans without a valuation allowance, Unpaid Principal Balance 3,604 6,287
Impaired loans, Valuation Allowance 14 20
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Average Outstanding Balance 832 168
Impaired loans without a valuation allowance, Average Outstanding Balance 4,623 4,636
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans with a valuation allowance, Interest Income Recognized 55 46
Impaired loans without a valuation allowance, Interest Income Recognized 258 279
Total residential real estate [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans, Outstanding Balance 5,486 6,893
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans, Unpaid Principal Balance 6,215 7,648
Impaired loans, Valuation Allowance 1,073 1,363
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans, Average Outstanding Balance 6,279 7,634
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans, Interest Income Recognized 120 131
Residential real estate senior liens [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Outstanding Balance 5,401 6,834
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans with a valuation allowance, Unpaid Principal Balance 5,830 7,289
Impaired loans, Valuation Allowance 1,073 1,361
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Average Outstanding Balance 6,210 7,545
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans with a valuation allowance, Interest Income Recognized 114 126
Residential real estate junior liens [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Outstanding Balance 0 12
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans with a valuation allowance, Unpaid Principal Balance 0 12
Impaired loans, Valuation Allowance 0 2
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Average Outstanding Balance 11 25
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 85 47
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans without a valuation allowance, Unpaid Principal Balance 385 347
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans without a valuation allowance, Average Outstanding Balance 58 64
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans without a valuation allowance, Interest Income Recognized 6 5
Total consumer [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans, Outstanding Balance 0 9
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans, Unpaid Principal Balance 0 9
Impaired loans, Valuation Allowance 0 0
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans, Average Outstanding Balance 5 12
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 0 9
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans without a valuation allowance, Unpaid Principal Balance 0 9
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans without a valuation allowance, Average Outstanding Balance 5 12
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans without a valuation allowance, Interest Income Recognized $ 0 $ 0