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Loans and ALLL (Summary of information pertaining to impaired loans) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Outstanding Balance $ 16,793   $ 12,944
Impaired loans without a valuation allowance, Outstanding Balance 14,302   13,709
Impaired loans, Outstanding Balance 31,095   26,653
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans with a valuation allowance, Unpaid Principal Balance 17,709   13,876
Impaired loans without a valuation allowance, Unpaid Principal Balance 14,676   14,083
Impaired loans, Unpaid Principal Balance 32,385   27,959
Impaired loans, Valuation Allowance 2,503   2,130
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Average Outstanding Balance 14,870 $ 14,852  
Impaired loans without a valuation allowance, Average Outstanding Balance 14,007 7,078  
Impaired loans, Average Outstanding Balance 28,877 21,930  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans with a valuation allowance, Interest Income Recognized 193 180  
Impaired loans without a valuation allowance, Interest Income Recognized 133 115  
Impaired loans, Interest Income Recognized 326 295  
Total commercial [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans, Outstanding Balance 11,675   8,099
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans, Unpaid Principal Balance 12,037   8,462
Impaired loans, Valuation Allowance 842   650
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans, Average Outstanding Balance 9,888 7,730  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans, Interest Income Recognized 167 132  
Commercial real estate [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Outstanding Balance 5,946   4,089
Impaired loans without a valuation allowance, Outstanding Balance 2,466   1,791
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans with a valuation allowance, Unpaid Principal Balance 6,234   4,378
Impaired loans without a valuation allowance, Unpaid Principal Balance 2,540   1,865
Impaired loans, Valuation Allowance 639   626
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Average Outstanding Balance 5,018 5,015  
Impaired loans without a valuation allowance, Average Outstanding Balance 2,129 1,326  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans with a valuation allowance, Interest Income Recognized 91 73  
Impaired loans without a valuation allowance, Interest Income Recognized 35 33  
Commercial other [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Outstanding Balance 2,099   995
Impaired loans without a valuation allowance, Outstanding Balance 1,164   1,224
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans with a valuation allowance, Unpaid Principal Balance 2,099   995
Impaired loans without a valuation allowance, Unpaid Principal Balance 1,164   1,224
Impaired loans, Valuation Allowance 203   24
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Average Outstanding Balance 1,547 1,275  
Impaired loans without a valuation allowance, Average Outstanding Balance 1,194 114  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans with a valuation allowance, Interest Income Recognized 24 24  
Impaired loans without a valuation allowance, Interest Income Recognized 17 2  
Total agricultural [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans, Outstanding Balance 11,468   10,598
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans, Unpaid Principal Balance 11,468   10,598
Impaired loans, Valuation Allowance 141   0
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans, Average Outstanding Balance 11,034 5,547  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans, Interest Income Recognized 80 75  
Agricultural real estate [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Outstanding Balance 881   0
Impaired loans without a valuation allowance, Outstanding Balance 8,082   7,913
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans with a valuation allowance, Unpaid Principal Balance 881   0
Impaired loans without a valuation allowance, Unpaid Principal Balance 8,082   7,913
Impaired loans, Valuation Allowance 141   0
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Average Outstanding Balance 441 0  
Impaired loans without a valuation allowance, Average Outstanding Balance 7,998 4,042  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans with a valuation allowance, Interest Income Recognized 4 0  
Impaired loans without a valuation allowance, Interest Income Recognized 40 62  
Agricultural other [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Outstanding Balance 0   0
Impaired loans without a valuation allowance, Outstanding Balance 2,505   2,685
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans with a valuation allowance, Unpaid Principal Balance 0   0
Impaired loans without a valuation allowance, Unpaid Principal Balance 2,505   2,685
Impaired loans, Valuation Allowance 0   0
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Average Outstanding Balance 0 67  
Impaired loans without a valuation allowance, Average Outstanding Balance 2,595 1,438  
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 36 13  
Total residential real estate [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans, Outstanding Balance 7,940   7,939
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans, Unpaid Principal Balance 8,868   8,882
Impaired loans, Valuation Allowance 1,520   1,480
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans, Average Outstanding Balance 7,940 8,628  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans, Interest Income Recognized 79 88  
Residential real estate senior liens [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Outstanding Balance 7,831   7,816
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans with a valuation allowance, Unpaid Principal Balance 8,459   8,459
Impaired loans, Valuation Allowance 1,514   1,473
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Average Outstanding Balance 7,824 8,420  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans with a valuation allowance, Interest Income Recognized 74 83  
Residential real estate junior liens [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Outstanding Balance 36   44
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans with a valuation allowance, Unpaid Principal Balance 36   44
Impaired loans, Valuation Allowance 6   7
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Average Outstanding Balance 40 75  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans with a valuation allowance, Interest Income Recognized 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 73   79
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans without a valuation allowance, Unpaid Principal Balance 373   379
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans without a valuation allowance, Average Outstanding Balance 76 133  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans without a valuation allowance, Interest Income Recognized 5 5  
Total Consumer [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans, Outstanding Balance 12   17
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans, Unpaid Principal Balance 12   17
Impaired loans, Valuation Allowance 0   0
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans, Average Outstanding Balance 15 25  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans, Interest Income Recognized 0 0  
Consumer secured [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans without a valuation allowance, Outstanding Balance 12   17
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans without a valuation allowance, Unpaid Principal Balance 12   $ 17
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans without a valuation allowance, Average Outstanding Balance 15 25  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans without a valuation allowance, Interest Income Recognized $ 0 $ 0