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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