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Allowance for Credit Losses, Impaired Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
With no related allowance recorded [Abstract]    
Recorded Investment $ 1,015 $ 4,963
Unpaid Principal Balance 1,116 5,016
Average Recorded Investment 1,173 4,705
Interest Income Recognized 22 158
With an allowance recorded [Abstract]    
Recorded Investment 5,303 2,592
Unpaid Principal Balance 5,364 2,844
Related Allowance 623 768
Average Recorded Investment 5,655 2,588
Interest Income Recognized 203 47
Total [Abstract]    
Recorded Investment 6,318 7,555
Unpaid Principal Balance 6,480 7,860
Related Allowance 623 768
Average Recorded Investment 6,828 7,293
Interest Income Recognized 225 205
Commercial Real Estate [Member]    
With no related allowance recorded [Abstract]    
Recorded Investment 104 184
Unpaid Principal Balance 104 184
Average Recorded Investment 107 354
Interest Income Recognized 11 7
With an allowance recorded [Abstract]    
Recorded Investment 2,973  
Unpaid Principal Balance 2,961  
Related Allowance 366  
Average Recorded Investment 2,999  
Interest Income Recognized 104  
Total [Abstract]    
Related Allowance 366  
Agricultural Real Estate [Member]    
With no related allowance recorded [Abstract]    
Recorded Investment 0 1,305
Unpaid Principal Balance 0 1,305
Average Recorded Investment 488 569
Interest Income Recognized 0 3
Residential 1st Mortgages [Member]    
With no related allowance recorded [Abstract]    
Recorded Investment 911 451
Unpaid Principal Balance 1,012 504
Average Recorded Investment 532 404
Interest Income Recognized 11 10
With an allowance recorded [Abstract]    
Recorded Investment 508 430
Unpaid Principal Balance 571 469
Related Allowance 25 21
Average Recorded Investment 469 336
Interest Income Recognized 16 13
Total [Abstract]    
Related Allowance 25 21
Home Equity Lines and Loans [Member]    
With no related allowance recorded [Abstract]    
Recorded Investment 0 0
Unpaid Principal Balance 0 0
Average Recorded Investment 16 181
Interest Income Recognized 0 0
With an allowance recorded [Abstract]    
Recorded Investment 73 90
Unpaid Principal Balance 89 97
Related Allowance 4 5
Average Recorded Investment 74 123
Interest Income Recognized 3 4
Total [Abstract]    
Related Allowance 4 5
Agricultural [Member]    
With no related allowance recorded [Abstract]    
Recorded Investment 0 0
Unpaid Principal Balance 0 0
Average Recorded Investment 30 144
Interest Income Recognized 0 5
With an allowance recorded [Abstract]    
Recorded Investment 0 625
Unpaid Principal Balance 0 625
Related Allowance 0 128
Average Recorded Investment 409 581
Interest Income Recognized 21 22
Total [Abstract]    
Related Allowance 0 128
Commercial [Member]    
With no related allowance recorded [Abstract]    
Recorded Investment   3,023
Unpaid Principal Balance   3,023
Average Recorded Investment   3,053
Interest Income Recognized   133
With an allowance recorded [Abstract]    
Recorded Investment 1,741 1,441
Unpaid Principal Balance 1,734 1,640
Related Allowance 220 608
Average Recorded Investment 1,693 1,536
Interest Income Recognized 59 8
Total [Abstract]    
Related Allowance 220 608
Consumer & Other [Member]    
With an allowance recorded [Abstract]    
Recorded Investment 8 6
Unpaid Principal Balance 9 13
Related Allowance 8 6
Average Recorded Investment 11 12
Interest Income Recognized 0 0
Total [Abstract]    
Related Allowance $ 8 $ 6