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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Outstanding Balance | $ 14,024 |  | $ 14,024 |  | $ 12,944
Impaired loans without a valuation allowance, Outstanding Balance | 17,330 |  | 17,330 |  | 13,709
Impaired loans, Outstanding Balance | 31,354 |  | 31,354 |  | 26,653
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Unpaid Principal Balance | 14,854 |  | 14,854 |  | 13,876
Impaired loans without a valuation allowance, Unpaid Principal Balance | 17,756 |  | 17,756 |  | 14,083
Impaired loans, Unpaid Principal Balance | 32,610 |  | 32,610 |  | 27,959
Impaired loans, Valuation Allowance | 2,074 |  | 2,074 |  | 2,130
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Average Outstanding Balance | 13,500 | $ 14,746 | 14,417 | $ 14,627 |
Impaired loans without a valuation allowance, Average Outstanding Balance | 17,521 | 12,795 | 15,846 | 10,018 |
Impaired loans, Average Outstanding Balance | 31,021 | 27,541 | 30,263 | 24,645 |
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Interest Income Recognized | 132 | 176 | 371 | 547 |
Impaired loans without a valuation allowance, Interest Income Recognized | 215 | 175 | 714 | 407 |
Impaired loans, Interest Income Recognized | 347 | 351 | 1,085 | 954 |
Total commercial [Member] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired loans, Outstanding Balance | 8,858 |  | 8,858 |  | 8,099
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans, Unpaid Principal Balance | 9,264 |  | 9,264 |  | 8,462
Impaired loans, Valuation Allowance | 481 |  | 481 |  | 650
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans, Average Outstanding Balance | 9,445 | 7,944 | 10,062 | 7,720 |
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |  |  |
Impaired loans, Interest Income Recognized | 40 | 129 | 249 | 389 |
Commercial real estate [Member] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Outstanding Balance | 4,324 |  | 4,324 |  | 4,089
Impaired loans without a valuation allowance, Outstanding Balance | 2,451 |  | 2,451 |  | 1,791
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Unpaid Principal Balance | 4,612 |  | 4,612 |  | 4,378
Impaired loans without a valuation allowance, Unpaid Principal Balance | 2,525 |  | 2,525 |  | 1,865
Impaired loans, Valuation Allowance | 474 |  | 474 |  | 626
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Average Outstanding Balance | 4,195 | 4,636 | 4,739 | 4,765 |
Impaired loans without a valuation allowance, Average Outstanding Balance | 3,076 | 1,546 | 2,763 | 1,483 |
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Interest Income Recognized | 14 | 68 | 118 | 225 |
Impaired loans without a valuation allowance, Interest Income Recognized | 8 | 31 | 55 | 83 |
Commercial other [Member] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Outstanding Balance | 729 |  | 729 |  | 995
Impaired loans without a valuation allowance, Outstanding Balance | 1,354 |  | 1,354 |  | 1,224
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Unpaid Principal Balance | 729 |  | 729 |  | 995
Impaired loans without a valuation allowance, Unpaid Principal Balance | 1,398 |  | 1,398 |  | 1,224
Impaired loans, Valuation Allowance | 7 |  | 7 |  | 24
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Average Outstanding Balance | 778 | 1,669 | 1,263 | 1,363 |
Impaired loans without a valuation allowance, Average Outstanding Balance | 1,396 | 93 | 1,297 | 109 |
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Interest Income Recognized | 16 | 28 | 55 | 75 |
Impaired loans without a valuation allowance, Interest Income Recognized | 2 | 2 | 21 | 6 |
Total agricultural [Member] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired loans, Outstanding Balance | 15,057 |  | 15,057 |  | 10,598
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans, Unpaid Principal Balance | 15,065 |  | 15,065 |  | 10,598
Impaired loans, Valuation Allowance | 193 |  | 193 |  | 0
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans, Average Outstanding Balance | 13,976 | 11,051 | 12,397 | 8,311 |
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |  |  |
Impaired loans, Interest Income Recognized | 290 | 137 | 724 | 303 |
Agricultural real estate [Member] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Outstanding Balance | 950 |  | 950 |  | 0
Impaired loans without a valuation allowance, Outstanding Balance | 7,249 |  | 7,249 |  | 7,913
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Unpaid Principal Balance | 950 |  | 950 |  | 0
Impaired loans without a valuation allowance, Unpaid Principal Balance | 7,257 |  | 7,257 |  | 7,913
Impaired loans, Valuation Allowance | 148 |  | 148 |  | 0
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Average Outstanding Balance | 673 | 0 | 584 | 0 |
Impaired loans without a valuation allowance, Average Outstanding Balance | 7,193 | 7,830 | 7,600 | 5,936 |
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Interest Income Recognized | 40 | 0 | 46 | 0 |
Impaired loans without a valuation allowance, Interest Income Recognized | 137 | 98 | 414 | 218 |
Agricultural other [Member] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Outstanding Balance | 647 |  | 647 |  | 0
Impaired loans without a valuation allowance, Outstanding Balance | 6,211 |  | 6,211 |  | 2,685
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Unpaid Principal Balance | 647 |  | 647 |  | 0
Impaired loans without a valuation allowance, Unpaid Principal Balance | 6,211 |  | 6,211 |  | 2,685
Impaired loans, Valuation Allowance | 45 |  | 45 |  | 0
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Average Outstanding Balance | 324 | 0 | 108 | 22 |
Impaired loans without a valuation allowance, Average Outstanding Balance | 5,786 | 3,221 | 4,105 | 2,353 |
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Interest Income Recognized | 45 | 0 | 45 | 0 |
Impaired loans without a valuation allowance, Interest Income Recognized | 68 | 39 | 219 | 85 |
Total residential real estate [Member] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired loans, Outstanding Balance | 7,429 |  | 7,429 |  | 7,939
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans, Unpaid Principal Balance | 8,271 |  | 8,271 |  | 8,882
Impaired loans, Valuation Allowance | 1,400 |  | 1,400 |  | 1,480
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans, Average Outstanding Balance | 7,589 | 8,527 | 7,791 | 8,592 |
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |  |  |
Impaired loans, Interest Income Recognized | 17 | 85 | 112 | 262 |
Residential real estate senior liens [Member] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Outstanding Balance | 7,361 |  | 7,361 |  | 7,816
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Unpaid Principal Balance | 7,903 |  | 7,903 |  | 8,459
Impaired loans, Valuation Allowance | 1,398 |  | 1,398 |  | 1,473
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Average Outstanding Balance | 7,512 | 8,333 | 7,694 | 8,379 |
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Interest Income Recognized | 17 | 79 | 107 | 245 |
Residential real estate junior liens [Member] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Outstanding Balance | 13 |  | 13 |  | 44
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Unpaid Principal Balance | 13 |  | 13 |  | 44
Impaired loans, Valuation Allowance | 2 |  | 2 |  | 7
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Average Outstanding Balance | 18 | 73 | 29 | 75 |
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Interest Income Recognized | 0 | 1 | 0 | 2 |
Residential real estate home equity lines of credit [Member] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired loans without a valuation allowance, Outstanding Balance | 55 |  | 55 |  | 79
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans without a valuation allowance, Unpaid Principal Balance | 355 |  | 355 |  | 379
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Average Outstanding Balance | 0 | 35 | 0 | 23 |
Impaired loans without a valuation allowance, Average Outstanding Balance | 59 | 86 | 68 | 115 |
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |  |  |
Impaired loans with a valuation allowance, Interest Income Recognized | 0 | 0 | 0 | 0 |
Impaired loans without a valuation allowance, Interest Income Recognized | 0 | 5 | 5 | 15 |
Total Consumer [Member] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired loans, Outstanding Balance | 10 |  | 10 |  | 17
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans, Unpaid Principal Balance | 10 |  | 10 |  | 17
Impaired loans, Valuation Allowance | 0 |  | 0 |  | 0
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans, Average Outstanding Balance | 11 | 19 | 13 | 22 |
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 | 10 |  | 10 |  | 17
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired loans without a valuation allowance, Unpaid Principal Balance | 10 |  | 10 |  | $ 17
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired loans without a valuation allowance, Average Outstanding Balance | 11 | 19 | 13 | 22 |
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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