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Loans and ALLL (Summary of information pertaining to impaired loans) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Outstanding Balance $ 9,834   $ 11,263
Impaired loans without a valuation allowance, Outstanding Balance 20,199   19,836
Impaired loans, Outstanding Balance 30,033   31,099
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans with a valuation allowance, Unpaid Principal Balance 10,507   11,960
Impaired loans without a valuation allowance, Unpaid Principal Balance 20,573   20,439
Impaired loans, Unpaid Principal Balance 31,080   32,399
Impaired loans, Valuation Allowance 1,509   1,938
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Average Outstanding Balance 10,549 $ 14,870  
Impaired loans without a valuation allowance, Average Outstanding Balance 20,019 14,007  
Impaired loans, Average Outstanding Balance 30,568 28,877  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans with a valuation allowance, Interest Income Recognized 123 193  
Impaired loans without a valuation allowance, Interest Income Recognized 157 133  
Impaired loans, Interest Income Recognized 280 326  
Total commercial [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans, Outstanding Balance 9,456   9,899
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans, Unpaid Principal Balance 9,773   10,401
Impaired loans, Valuation Allowance 94   443
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans, Average Outstanding Balance 9,678 9,888  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans, Interest Income Recognized 123 167  
Commercial real estate [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Outstanding Balance 2,849   3,969
Impaired loans without a valuation allowance, Outstanding Balance 3,780   2,794
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans with a valuation allowance, Unpaid Principal Balance 3,092   4,211
Impaired loans without a valuation allowance, Unpaid Principal Balance 3,854   2,947
Impaired loans, Valuation Allowance 89   437
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Average Outstanding Balance 3,409 5,018  
Impaired loans without a valuation allowance, Average Outstanding Balance 3,287 2,129  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans with a valuation allowance, Interest Income Recognized 49 91  
Impaired loans without a valuation allowance, Interest Income Recognized 53 35  
Commercial other [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Outstanding Balance 11   12
Impaired loans without a valuation allowance, Outstanding Balance 2,816   3,124
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans with a valuation allowance, Unpaid Principal Balance 11   12
Impaired loans without a valuation allowance, Unpaid Principal Balance 2,816   3,231
Impaired loans, Valuation Allowance 5   6
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Average Outstanding Balance 12 1,547  
Impaired loans without a valuation allowance, Average Outstanding Balance 2,970 1,194  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans with a valuation allowance, Interest Income Recognized 0 24  
Impaired loans without a valuation allowance, Interest Income Recognized 21 17  
Total agricultural [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans, Outstanding Balance 13,989   14,298
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans, Unpaid Principal Balance 13,989   14,341
Impaired loans, Valuation Allowance 118   132
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans, Average Outstanding Balance 14,144 11,034  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans, Interest Income Recognized 83 80  
Agricultural real estate [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Outstanding Balance 388   392
Impaired loans without a valuation allowance, Outstanding Balance 7,628   7,618
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans with a valuation allowance, Unpaid Principal Balance 388   392
Impaired loans without a valuation allowance, Unpaid Principal Balance 7,628   7,618
Impaired loans, Valuation Allowance 96   112
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Average Outstanding Balance 390 441  
Impaired loans without a valuation allowance, Average Outstanding Balance 7,623 7,998  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans with a valuation allowance, Interest Income Recognized 6 4  
Impaired loans without a valuation allowance, Interest Income Recognized 7 40  
Agricultural other [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Outstanding Balance 44   44
Impaired loans without a valuation allowance, Outstanding Balance 5,929   6,244
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans with a valuation allowance, Unpaid Principal Balance 44   44
Impaired loans without a valuation allowance, Unpaid Principal Balance 5,929   6,287
Impaired loans, Valuation Allowance 22   20
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Average Outstanding Balance 44 0  
Impaired loans without a valuation allowance, Average Outstanding Balance 6,087 2,595  
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 70 36  
Total residential real estate [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans, Outstanding Balance 6,580   6,893
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans, Unpaid Principal Balance 7,310   7,648
Impaired loans, Valuation Allowance 1,297   1,363
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans, Average Outstanding Balance 6,737 7,940  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans, Interest Income Recognized 74 79  
Residential real estate senior liens [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Outstanding Balance 6,530   6,834
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans with a valuation allowance, Unpaid Principal Balance 6,960   7,289
Impaired loans, Valuation Allowance 1,295   1,361
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Average Outstanding Balance 6,682 7,824  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans with a valuation allowance, Interest Income Recognized 68 74  
Residential real estate junior liens [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Outstanding Balance 12   12
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans with a valuation allowance, Unpaid Principal Balance 12   12
Impaired loans, Valuation Allowance 2   2
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans with a valuation allowance, Average Outstanding Balance 12 40  
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 38   47
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans without a valuation allowance, Unpaid Principal Balance 338   347
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans without a valuation allowance, Average Outstanding Balance 43 76  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans without a valuation allowance, Interest Income Recognized 6 5  
Total Consumer [Member]      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired loans, Outstanding Balance 8   9
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans, Unpaid Principal Balance 8   9
Impaired loans, Valuation Allowance 0   0
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans, Average Outstanding Balance 9 15  
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 8   9
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired loans without a valuation allowance, Unpaid Principal Balance 8   $ 9
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired loans without a valuation allowance, Average Outstanding Balance 9 15  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired loans without a valuation allowance, Interest Income Recognized $ 0 $ 0