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Loans and ALLL (Summary of information pertaining to impaired loans) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Outstanding Balance $ 16,141 $ 19,938
Impaired loans without a valuation allowance, Outstanding Balance 6,197 5,910
Impaired loans, Outstanding Balance 22,338 25,848
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans with a valuation allowance, Unpaid Principal Balance 17,048 21,823
Impaired loans without a valuation allowance, Unpaid Principal Balance 6,649 6,399
Impaired loans, Unpaid Principal Balance 23,697 28,222
Impaired loans, Valuation Allowance 2,820 3,427
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Average Outstanding Balance 18,594 20,890
Impaired loans without a valuation allowance, Average Outstanding Balance 4,619 6,942
Impaired loans, Average Outstanding Balance 23,213 27,832
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans with a valuation allowance, Interest Income Recognized 848 977
Impaired loans without a valuation allowance, Interest Income Recognized 341 445
Impaired loans, Interest Income Recognized 1,189 1,422
Total commercial [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans, Outstanding Balance 7,969 12,029
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans, Unpaid Principal Balance 8,232 12,736
Impaired loans, Valuation Allowance 829 1,283
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans, Average Outstanding Balance 9,859 13,019
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans, Interest Income Recognized 607 769
Commercial real estate [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Outstanding Balance 5,659 7,115
Impaired loans without a valuation allowance, Outstanding Balance 2,122 4,116
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans with a valuation allowance, Unpaid Principal Balance 5,777 7,234
Impaired loans without a valuation allowance, Unpaid Principal Balance 2,256 4,462
Impaired loans, Valuation Allowance 818 1,279
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Average Outstanding Balance 7,221 6,958
Impaired loans without a valuation allowance, Average Outstanding Balance 2,170 4,997
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans with a valuation allowance, Interest Income Recognized 376 392
Impaired loans without a valuation allowance, Interest Income Recognized 201 309
Commercial other [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Outstanding Balance 8 609
Impaired loans without a valuation allowance, Outstanding Balance 180 189
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans with a valuation allowance, Unpaid Principal Balance 8 828
Impaired loans without a valuation allowance, Unpaid Principal Balance 191 212
Impaired loans, Valuation Allowance 11 4
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Average Outstanding Balance 362 704
Impaired loans without a valuation allowance, Average Outstanding Balance 106 360
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans with a valuation allowance, Interest Income Recognized 19 51
Impaired loans without a valuation allowance, Interest Income Recognized 11 17
Total agricultural [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans, Outstanding Balance 4,068 1,595
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans, Unpaid Principal Balance 4,068 1,715
Impaired loans, Valuation Allowance 2 0
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans, Average Outstanding Balance 2,341 1,640
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans, Interest Income Recognized 119 119
Agricultural real estate [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 3,549 1,529
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 3,549 1,529
Impaired loans, Valuation Allowance 0 0
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Average Outstanding Balance 22 85
Impaired loans without a valuation allowance, Average Outstanding Balance 1,903 1,455
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans with a valuation allowance, Interest Income Recognized 1 0
Impaired loans without a valuation allowance, Interest Income Recognized 95 89
Agricultural other [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Outstanding Balance 335 0
Impaired loans without a valuation allowance, Outstanding Balance 184 66
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans with a valuation allowance, Unpaid Principal Balance 335 0
Impaired loans without a valuation allowance, Unpaid Principal Balance 184 186
Impaired loans, Valuation Allowance 2 0
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Average Outstanding Balance 126 0
Impaired loans without a valuation allowance, Average Outstanding Balance 290 100
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans with a valuation allowance, Interest Income Recognized 8 0
Impaired loans without a valuation allowance, Interest Income Recognized 15 30
Total residential real estate [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans, Outstanding Balance 10,266 12,160
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans, Unpaid Principal Balance 11,362 13,707
Impaired loans, Valuation Allowance 1,989 2,143
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans, Average Outstanding Balance 10,968 13,099
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans, Interest Income Recognized 459 530
Residential real estate senior liens [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Outstanding Balance 9,996 11,645
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans with a valuation allowance, Unpaid Principal Balance 10,765 12,782
Impaired loans, Valuation Allowance 1,959 2,015
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Average Outstanding Balance 10,610 12,713
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans with a valuation allowance, Interest Income Recognized 425 509
Residential real estate junior liens [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Outstanding Balance 143 265
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans with a valuation allowance, Unpaid Principal Balance 163 275
Impaired loans, Valuation Allowance 30 53
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Average Outstanding Balance 183 133
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans with a valuation allowance, Interest Income Recognized 16 0
Residential real estate home equity lines of credit [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Outstanding Balance 0 250
Impaired loans without a valuation allowance, Outstanding Balance 127 0
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans with a valuation allowance, Unpaid Principal Balance 0 650
Impaired loans without a valuation allowance, Unpaid Principal Balance 434 0
Impaired loans, Valuation Allowance 0 75
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Average Outstanding Balance 31 229
Impaired loans without a valuation allowance, Average Outstanding Balance 144 24
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans with a valuation allowance, Interest Income Recognized 0 21
Impaired loans without a valuation allowance, Interest Income Recognized 18 0
Total consumer [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans, Outstanding Balance 35 64
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans, Unpaid Principal Balance 35 64
Impaired loans, Valuation Allowance 0 1
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans, Average Outstanding Balance 45 74
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans, Interest Income Recognized 4 4
Consumer secured [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Outstanding Balance 0 54
Impaired loans without a valuation allowance, Outstanding Balance 35 10
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans with a valuation allowance, Unpaid Principal Balance 0 54
Impaired loans without a valuation allowance, Unpaid Principal Balance 35 10
Impaired loans, Valuation Allowance 0 1
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Average Outstanding Balance 39 68
Impaired loans without a valuation allowance, Average Outstanding Balance 6 6
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans with a valuation allowance, Interest Income Recognized 3 4
Impaired loans without a valuation allowance, Interest Income Recognized $ 1 $ 0