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Loans and ALLL (Summary of information pertaining to impaired loans) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Outstanding Balance | $ 9,674 |  | $ 9,674 |  | $ 11,263
Impaired loans without a valuation allowance, Outstanding Balance | 18,671 |  | 18,671 |  | 19,836
Impaired loans, Outstanding Balance | 28,345 |  | 28,345 |  | 31,099
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Unpaid Principal Balance | 10,387 |  | 10,387 |  | 11,960
Impaired loans without a valuation allowance, Unpaid Principal Balance | 19,110 |  | 19,110 |  | 20,439
Impaired loans, Unpaid Principal Balance | 29,497 |  | 29,497 |  | 32,399
Impaired loans, Valuation Allowance | 1,333 |  | 1,333 |  | 1,938
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Average Outstanding Balance | 10,470 | $ 13,500 | 10,523 | $ 14,417 |
Impaired loans without a valuation allowance, Average Outstanding Balance | 18,153 | 17,521 | 19,030 | 15,846 |
Impaired loans, Average Outstanding Balance | 28,623 | 31,021 | 29,553 | 30,263 |
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Interest Income Recognized | 37 | 132 | 252 | 371 |
Impaired loans without a valuation allowance, Interest Income Recognized | 109 | 215 | 444 | 714 |
Impaired loans, Interest Income Recognized | 146 | 347 | 696 | 1,085 |
Total commercial [Member] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired loans, Outstanding Balance | 8,626 |  | 8,626 |  | 9,899
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans, Unpaid Principal Balance | 9,008 |  | 9,008 |  | 10,401
Impaired loans, Valuation Allowance | 34 |  | 34 |  | 443
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans, Average Outstanding Balance | 8,828 | 9,445 | 9,250 | 10,062 |
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |  |  |
Impaired loans, Interest Income Recognized | 21 | 40 | 185 | 249 |
Commercial real estate [Member] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Outstanding Balance | 947 |  | 947 |  | 3,969
Impaired loans without a valuation allowance, Outstanding Balance | 5,139 |  | 5,139 |  | 2,794
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Unpaid Principal Balance | 1,190 |  | 1,190 |  | 4,211
Impaired loans without a valuation allowance, Unpaid Principal Balance | 5,278 |  | 5,278 |  | 2,947
Impaired loans, Valuation Allowance | 29 |  | 29 |  | 437
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Average Outstanding Balance | 1,546 | 4,195 | 2,484 | 4,739 |
Impaired loans without a valuation allowance, Average Outstanding Balance | 4,664 | 3,076 | 3,979 | 2,763 |
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Interest Income Recognized | 2 | 14 | 58 | 118 |
Impaired loans without a valuation allowance, Interest Income Recognized | 12 | 8 | 86 | 55 |
Commercial other [Member] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Outstanding Balance | 11 |  | 11 |  | 12
Impaired loans without a valuation allowance, Outstanding Balance | 2,529 |  | 2,529 |  | 3,124
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Unpaid Principal Balance | 11 |  | 11 |  | 12
Impaired loans without a valuation allowance, Unpaid Principal Balance | 2,529 |  | 2,529 |  | 3,231
Impaired loans, Valuation Allowance | 5 |  | 5 |  | 6
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Average Outstanding Balance | 11 | 778 | 11 | 1,263 |
Impaired loans without a valuation allowance, Average Outstanding Balance | 2,607 | 1,396 | 2,776 | 1,297 |
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Interest Income Recognized | 0 | 16 | 0 | 55 |
Impaired loans without a valuation allowance, Interest Income Recognized | 7 | 2 | 41 | 21 |
Total agricultural [Member] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired loans, Outstanding Balance | 13,766 |  | 13,766 |  | 14,298
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans, Unpaid Principal Balance | 13,766 |  | 13,766 |  | 14,341
Impaired loans, Valuation Allowance | 132 |  | 132 |  | 132
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans, Average Outstanding Balance | 13,620 | 13,976 | 13,831 | 12,397 |
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |  |  |
Impaired loans, Interest Income Recognized | 111 | 290 | 404 | 724 |
Agricultural real estate [Member] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Outstanding Balance | 1,512 |  | 1,512 |  | 392
Impaired loans without a valuation allowance, Outstanding Balance | 7,005 |  | 7,005 |  | 7,618
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Unpaid Principal Balance | 1,512 |  | 1,512 |  | 392
Impaired loans without a valuation allowance, Unpaid Principal Balance | 7,005 |  | 7,005 |  | 7,618
Impaired loans, Valuation Allowance | 101 |  | 101 |  | 112
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Average Outstanding Balance | 1,513 | 673 | 951 | 584 |
Impaired loans without a valuation allowance, Average Outstanding Balance | 6,995 | 7,193 | 7,308 | 7,600 |
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Interest Income Recognized | 10 | 40 | 73 | 46 |
Impaired loans without a valuation allowance, Interest Income Recognized | 45 | 137 | 110 | 414 |
Agricultural other [Member] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Outstanding Balance | 1,347 |  | 1,347 |  | 44
Impaired loans without a valuation allowance, Outstanding Balance | 3,902 |  | 3,902 |  | 6,244
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Unpaid Principal Balance | 1,347 |  | 1,347 |  | 44
Impaired loans without a valuation allowance, Unpaid Principal Balance | 3,902 |  | 3,902 |  | 6,287
Impaired loans, Valuation Allowance | 31 |  | 31 |  | 20
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Average Outstanding Balance | 1,292 | 324 | 659 | 108 |
Impaired loans without a valuation allowance, Average Outstanding Balance | 3,820 | 5,786 | 4,913 | 4,105 |
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Interest Income Recognized | 11 | 45 | 20 | 45 |
Impaired loans without a valuation allowance, Interest Income Recognized | 45 | 68 | 201 | 219 |
Total residential real estate [Member] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired loans, Outstanding Balance | 5,953 |  | 5,953 |  | 6,893
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans, Unpaid Principal Balance | 6,723 |  | 6,723 |  | 7,648
Impaired loans, Valuation Allowance | 1,167 |  | 1,167 |  | 1,363
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans, Average Outstanding Balance | 6,171 | 7,589 | 6,465 | 7,791 |
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |  |  |
Impaired loans, Interest Income Recognized | 14 | 17 | 107 | 112 |
Residential real estate senior liens [Member] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Outstanding Balance | 5,845 |  | 5,845 |  | 6,834
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Unpaid Principal Balance | 6,315 |  | 6,315 |  | 7,289
Impaired loans, Valuation Allowance | 1,165 |  | 1,165 |  | 1,361
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Average Outstanding Balance | 6,096 | 7,512 | 6,406 | 7,694 |
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Interest Income Recognized | 14 | 17 | 101 | 107 |
Residential real estate junior liens [Member] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Outstanding Balance | 12 |  | 12 |  | 12
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Unpaid Principal Balance | 12 |  | 12 |  | 12
Impaired loans, Valuation Allowance | 2 |  | 2 |  | 2
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Average Outstanding Balance | 12 | 18 | 12 | 29 |
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 | 96 |  | 96 |  | 47
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans without a valuation allowance, Unpaid Principal Balance | 396 |  | 396 |  | 347
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans without a valuation allowance, Average Outstanding Balance | 63 | 59 | 47 | 68 |
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |  |  |
Impaired loans without a valuation allowance, Interest Income Recognized | 0 | 0 | 6 | 5 |
Total Consumer [Member] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired loans, Outstanding Balance | 0 |  | 0 |  | 9
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans, Unpaid Principal Balance | 0 |  | 0 |  | 9
Impaired loans, Valuation Allowance | 0 |  | 0 |  | 0
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans, Average Outstanding Balance | 4 | 11 | 7 | 13 |
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |  |  |
Impaired loans, Interest Income Recognized | 0 | 0 | 0 | 0 |
Consumer secured [Member] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired loans without a valuation allowance, Outstanding Balance | 0 |  | 0 |  | 9
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans without a valuation allowance, Unpaid Principal Balance | 0 |  | 0 |  | $ 9
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans without a valuation allowance, Average Outstanding Balance | 4 | 11 | 7 | 13 |
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |  |  |
Impaired loans without a valuation allowance, Interest Income Recognized | $ 0 | $ 0 | $ 0 | $ 0 |

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