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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, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Outstanding Balance | $ 12,973 |  | $ 12,973 |  | $ 12,944
Impaired loans without a valuation allowance, Outstanding Balance | 17,710 |  | 17,710 |  | 13,709
Impaired loans, Outstanding Balance | 30,683 |  | 30,683 |  | 26,653
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Unpaid Principal Balance | 13,832 |  | 13,832 |  | 13,876
Impaired loans without a valuation allowance, Unpaid Principal Balance | 18,169 |  | 18,169 |  | 14,083
Impaired loans, Unpaid Principal Balance | 32,001 |  | 32,001 |  | 27,959
Impaired loans, Valuation Allowance | 2,059 |  | 2,059 |  | 2,130
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Average Outstanding Balance | 14,885 | $ 14,284 | 14,877 | $ 14,567 |
Impaired loans without a valuation allowance, Average Outstanding Balance | 16,008 | 10,181 | 15,007 | 8,630 |
Impaired loans, Average Outstanding Balance | 30,893 | 24,465 | 29,884 | 23,197 |
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Interest Income Recognized | 46 | 191 | 239 | 371 |
Impaired loans without a valuation allowance, Interest Income Recognized | 366 | 117 | 499 | 232 |
Impaired loans, Interest Income Recognized | 412 | 308 | 738 | 603 |
Total commercial [Member] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired loans, Outstanding Balance | 10,030 |  | 10,030 |  | 8,099
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans, Unpaid Principal Balance | 10,478 |  | 10,478 |  | 8,462
Impaired loans, Valuation Allowance | 506 |  | 506 |  | 650
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans, Average Outstanding Balance | 10,854 | 7,482 | 10,371 | 7,604 |
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |  |  |
Impaired loans, Interest Income Recognized | 42 | 128 | 209 | 260 |
Commercial real estate [Member] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Outstanding Balance | 4,065 |  | 4,065 |  | 4,089
Impaired loans without a valuation allowance, Outstanding Balance | 3,701 |  | 3,701 |  | 1,791
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Unpaid Principal Balance | 4,354 |  | 4,354 |  | 4,378
Impaired loans without a valuation allowance, Unpaid Principal Balance | 3,816 |  | 3,816 |  | 1,865
Impaired loans, Valuation Allowance | 492 |  | 492 |  | 626
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Average Outstanding Balance | 5,006 | 4,641 | 5,012 | 4,825 |
Impaired loans without a valuation allowance, Average Outstanding Balance | 3,084 | 1,576 | 2,606 | 1,451 |
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Interest Income Recognized | 13 | 84 | 104 | 157 |
Impaired loans without a valuation allowance, Interest Income Recognized | 12 | 19 | 47 | 52 |
Commercial other [Member] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Outstanding Balance | 827 |  | 827 |  | 995
Impaired loans without a valuation allowance, Outstanding Balance | 1,437 |  | 1,437 |  | 1,224
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Unpaid Principal Balance | 827 |  | 827 |  | 995
Impaired loans without a valuation allowance, Unpaid Principal Balance | 1,481 |  | 1,481 |  | 1,224
Impaired loans, Valuation Allowance | 14 |  | 14 |  | 24
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Average Outstanding Balance | 1,463 | 1,146 | 1,505 | 1,211 |
Impaired loans without a valuation allowance, Average Outstanding Balance | 1,301 | 119 | 1,248 | 117 |
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Interest Income Recognized | 15 | 23 | 39 | 47 |
Impaired loans without a valuation allowance, Interest Income Recognized | 2 | 2 | 19 | 4 |
Total agricultural [Member] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired loans, Outstanding Balance | 12,894 |  | 12,894 |  | 10,598
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans, Unpaid Principal Balance | 12,894 |  | 12,894 |  | 10,598
Impaired loans, Valuation Allowance | 102 |  | 102 |  | 0
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans, Average Outstanding Balance | 12,182 | 8,338 | 11,608 | 6,944 |
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |  |  |
Impaired loans, Interest Income Recognized | 354 | 91 | 434 | 166 |
Agricultural real estate [Member] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Outstanding Balance | 396 |  | 396 |  | 0
Impaired loans without a valuation allowance, Outstanding Balance | 7,137 |  | 7,137 |  | 7,913
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Unpaid Principal Balance | 396 |  | 396 |  | 0
Impaired loans without a valuation allowance, Unpaid Principal Balance | 7,137 |  | 7,137 |  | 7,913
Impaired loans, Valuation Allowance | 102 |  | 102 |  | 0
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Average Outstanding Balance | 639 | 0 | 540 | 0 |
Impaired loans without a valuation allowance, Average Outstanding Balance | 7,610 | 5,937 | 7,804 | 4,990 |
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Interest Income Recognized | 2 | 0 | 6 | 0 |
Impaired loans without a valuation allowance, Interest Income Recognized | 237 | 58 | 277 | 120 |
Agricultural other [Member] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired loans without a valuation allowance, Outstanding Balance | 5,361 |  | 5,361 |  | 2,685
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans without a valuation allowance, Unpaid Principal Balance | 5,361 |  | 5,361 |  | 2,685
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Average Outstanding Balance |  |  | 0 | 34 |
Impaired loans without a valuation allowance, Average Outstanding Balance | 3,933 | 2,401 | 3,264 | 1,920 |
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Interest Income Recognized |  |  | 0 | 0 |
Impaired loans without a valuation allowance, Interest Income Recognized | 115 | 33 | 151 | 46 |
Total residential real estate [Member] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired loans, Outstanding Balance | 7,748 |  | 7,748 |  | 7,939
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans, Unpaid Principal Balance | 8,618 |  | 8,618 |  | 8,882
Impaired loans, Valuation Allowance | 1,451 |  | 1,451 |  | 1,480
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans, Average Outstanding Balance | 7,845 | 8,623 | 7,892 | 8,626 |
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |  |  |
Impaired loans, Interest Income Recognized | 16 | 89 | 95 | 177 |
Residential real estate senior liens [Member] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Outstanding Balance | 7,662 |  | 7,662 |  | 7,816
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Unpaid Principal Balance | 8,232 |  | 8,232 |  | 8,459
Impaired loans, Valuation Allowance | 1,447 |  | 1,447 |  | 1,473
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Average Outstanding Balance | 7,747 | 8,385 | 7,785 | 8,403 |
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Interest Income Recognized | 16 | 83 | 90 | 166 |
Residential real estate junior liens [Member] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Outstanding Balance | 23 |  | 23 |  | 44
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Unpaid Principal Balance | 23 |  | 23 |  | 44
Impaired loans, Valuation Allowance | 4 |  | 4 |  | 7
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Average Outstanding Balance | 30 | 77 | 35 | 76 |
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Interest Income Recognized | 0 | 1 | 0 | 1 |
Residential real estate home equity lines of credit [Member] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired loans without a valuation allowance, Outstanding Balance | 63 |  | 63 |  | 79
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans without a valuation allowance, Unpaid Principal Balance | 363 |  | 363 |  | 379
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Average Outstanding Balance | 0 | 35 | 0 | 18 |
Impaired loans without a valuation allowance, Average Outstanding Balance | 68 | 126 | 72 | 129 |
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Interest Income Recognized |  | 0 | 0 | 0 |
Impaired loans without a valuation allowance, Interest Income Recognized | 0 | 5 | 5 | 10 |
Total Consumer [Member] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired loans, Outstanding Balance | 11 |  | 11 |  | 17
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans, Unpaid Principal Balance | 11 |  | 11 |  | 17
Impaired loans, Valuation Allowance | 0 |  | 0 |  | 0
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans, Average Outstanding Balance | 12 | 22 | 13 | 23 |
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 | 11 |  | 11 |  | 17
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans without a valuation allowance, Unpaid Principal Balance | 11 |  | 11 |  | $ 17
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans without a valuation allowance, Average Outstanding Balance | 12 | 22 | 13 | 23 |
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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