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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Outstanding Balance | $ 11,264 |  | $ 11,264 |  | $ 11,263
Impaired loans without a valuation allowance, Outstanding Balance | 17,633 |  | 17,633 |  | 19,836
Impaired loans, Outstanding Balance | 28,897 |  | 28,897 |  | 31,099
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Unpaid Principal Balance | 11,976 |  | 11,976 |  | 11,960
Impaired loans without a valuation allowance, Unpaid Principal Balance | 18,072 |  | 18,072 |  | 20,439
Impaired loans, Unpaid Principal Balance | 30,048 |  | 30,048 |  | 32,399
Impaired loans, Valuation Allowance | 1,479 |  | 1,479 |  | 1,938
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Average Outstanding Balance | 10,551 | $ 14,885 | 10,550 | $ 14,877 |
Impaired loans without a valuation allowance, Average Outstanding Balance | 18,918 | 16,008 | 19,468 | 15,007 |
Impaired loans, Average Outstanding Balance | 29,469 | 30,893 | 30,018 | 29,884 |
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Interest Income Recognized | 92 | 46 | 215 | 239 |
Impaired loans without a valuation allowance, Interest Income Recognized | 178 | 366 | 335 | 499 |
Impaired loans, Interest Income Recognized | 270 | 412 | 550 | 738 |
Total commercial [Member] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired loans, Outstanding Balance | 9,029 |  | 9,029 |  | 9,899
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans, Unpaid Principal Balance | 9,409 |  | 9,409 |  | 10,401
Impaired loans, Valuation Allowance | 58 |  | 58 |  | 443
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans, Average Outstanding Balance | 9,244 | 10,854 | 9,460 | 10,371 |
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |  |  |
Impaired loans, Interest Income Recognized | 41 | 42 | 164 | 209 |
Commercial real estate [Member] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Outstanding Balance | 2,144 |  | 2,144 |  | 3,969
Impaired loans without a valuation allowance, Outstanding Balance | 4,189 |  | 4,189 |  | 2,794
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Unpaid Principal Balance | 2,385 |  | 2,385 |  | 4,211
Impaired loans without a valuation allowance, Unpaid Principal Balance | 4,328 |  | 4,328 |  | 2,947
Impaired loans, Valuation Allowance | 53 |  | 53 |  | 437
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Average Outstanding Balance | 2,497 | 5,006 | 2,952 | 5,012 |
Impaired loans without a valuation allowance, Average Outstanding Balance | 3,985 | 3,084 | 3,636 | 2,606 |
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Interest Income Recognized | 7 | 13 | 56 | 104 |
Impaired loans without a valuation allowance, Interest Income Recognized | 21 | 12 | 74 | 47 |
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 | 2,685 |  | 2,685 |  | 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 | 2,685 |  | 2,685 |  | 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 | 1,463 | 11 | 1,505 |
Impaired loans without a valuation allowance, Average Outstanding Balance | 2,751 | 1,301 | 2,861 | 1,248 |
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Interest Income Recognized | 0 | 15 | 0 | 39 |
Impaired loans without a valuation allowance, Interest Income Recognized | 13 | 2 | 34 | 19 |
Total agricultural [Member] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired loans, Outstanding Balance | 13,472 |  | 13,472 |  | 14,298
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans, Unpaid Principal Balance | 13,472 |  | 13,472 |  | 14,341
Impaired loans, Valuation Allowance | 123 |  | 123 |  | 132
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans, Average Outstanding Balance | 13,732 | 12,182 | 13,939 | 11,608 |
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |  |  |
Impaired loans, Interest Income Recognized | 210 | 354 | 293 | 434 |
Agricultural real estate [Member] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Outstanding Balance | 1,513 |  | 1,513 |  | 392
Impaired loans without a valuation allowance, Outstanding Balance | 6,985 |  | 6,985 |  | 7,618
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Unpaid Principal Balance | 1,513 |  | 1,513 |  | 392
Impaired loans without a valuation allowance, Unpaid Principal Balance | 6,985 |  | 6,985 |  | 7,618
Impaired loans, Valuation Allowance | 97 |  | 97 |  | 112
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Average Outstanding Balance | 951 | 639 | 671 | 540 |
Impaired loans without a valuation allowance, Average Outstanding Balance | 7,307 | 7,610 | 7,465 | 7,804 |
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Interest Income Recognized | 57 | 2 | 63 | 6 |
Impaired loans without a valuation allowance, Interest Income Recognized | 58 | 237 | 65 | 277 |
Agricultural other [Member] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Outstanding Balance | 1,237 |  | 1,237 |  | 44
Impaired loans without a valuation allowance, Outstanding Balance | 3,737 |  | 3,737 |  | 6,244
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Unpaid Principal Balance | 1,237 |  | 1,237 |  | 44
Impaired loans without a valuation allowance, Unpaid Principal Balance | 3,737 |  | 3,737 |  | 6,287
Impaired loans, Valuation Allowance | 26 |  | 26 |  | 20
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Average Outstanding Balance | 641 | 0 | 343 | 0 |
Impaired loans without a valuation allowance, Average Outstanding Balance | 4,833 | 3,933 | 5,460 | 3,264 |
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Interest Income Recognized | 9 | 0 | 9 | 0 |
Impaired loans without a valuation allowance, Interest Income Recognized | 86 | 115 | 156 | 151 |
Total residential real estate [Member] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired loans, Outstanding Balance | 6,389 |  | 6,389 |  | 6,893
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans, Unpaid Principal Balance | 7,160 |  | 7,160 |  | 7,648
Impaired loans, Valuation Allowance | 1,298 |  | 1,298 |  | 1,363
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans, Average Outstanding Balance | 6,485 | 7,845 | 6,611 | 7,892 |
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |  |  |
Impaired loans, Interest Income Recognized | 19 | 16 | 93 | 95 |
Residential real estate senior liens [Member] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Outstanding Balance | 6,347 |  | 6,347 |  | 6,834
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Unpaid Principal Balance | 6,818 |  | 6,818 |  | 7,289
Impaired loans, Valuation Allowance | 1,296 |  | 1,296 |  | 1,361
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Average Outstanding Balance | 6,439 | 7,747 | 6,561 | 7,785 |
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Interest Income Recognized | 19 | 16 | 87 | 90 |
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 | 30 | 12 | 35 |
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 | 30 |  | 30 |  | 47
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans without a valuation allowance, Unpaid Principal Balance | 330 |  | 330 |  | 347
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans without a valuation allowance, Average Outstanding Balance | 34 | 68 | 38 | 72 |
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 | 7 |  | 7 |  | 9
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans, Unpaid Principal Balance | 7 |  | 7 |  | 9
Impaired loans, Valuation Allowance | 0 |  | 0 |  | 0
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans, Average Outstanding Balance | 8 | 12 | 8 | 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 | 7 |  | 7 |  | 9
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans without a valuation allowance, Unpaid Principal Balance | 7 |  | 7 |  | $ 9
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans without a valuation allowance, Average Outstanding Balance | 8 | 12 | 8 | 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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