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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