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Loans and Allowance for Loan Losses (Details 4) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Commercial & Industrial [Member]          
Summary of Impaired loan activity          
With no related allowance recorded, Recorded Investment    
With no related allowance recorded, Unpaid Principal Balance    
With no related allowance recorded, Related Allowance    
With no related allowance recorded, Average Recorded Investment
With no related allowance recorded, Interest Income Recognized
With a specific allowance recorded, Recorded Investment     50
With a specific allowance recorded, Unpaid Principal Balance     50
With a specific allowance recorded, Related Allowance     50
With a specific allowance recorded, Average Recorded Investment 50
With a specific allowance recorded, Interest Income Recognized 3
Total Recorded Investment     50
Total Unpaid Principal Balance     50
Total Related Allowance     50
Total Average Recorded Investment 50
Total Interest Income Recognized 3
Commercial RE & Construction [Member]          
Summary of Impaired loan activity          
With no related allowance recorded, Recorded Investment 705   705   637
With no related allowance recorded, Unpaid Principal Balance 731   731   637
With no related allowance recorded, Related Allowance    
With no related allowance recorded, Average Recorded Investment 754 647 757 658 655
With no related allowance recorded, Interest Income Recognized 7 6 29 16 24
With a specific allowance recorded, Recorded Investment 689   689   941
With a specific allowance recorded, Unpaid Principal Balance 689   689   941
With a specific allowance recorded, Related Allowance 146   146   119
With a specific allowance recorded, Average Recorded Investment 689 1,404 721 1,404 1,010
With a specific allowance recorded, Interest Income Recognized (2) 45
Total Recorded Investment 1,394   1,394   1,578
Total Unpaid Principal Balance 1,420   1,420   1,578
Total Related Allowance 146   146   119
Total Average Recorded Investment 1,443 2,051 1,478 2,062 1,665
Total Interest Income Recognized 7 6 27 16 69
Agricultural & Farmland [Member]          
Summary of Impaired loan activity          
With no related allowance recorded, Recorded Investment    
With no related allowance recorded, Unpaid Principal Balance    
With no related allowance recorded, Related Allowance    
With no related allowance recorded, Average Recorded Investment
With no related allowance recorded, Interest Income Recognized
With a specific allowance recorded, Recorded Investment    
With a specific allowance recorded, Unpaid Principal Balance    
With a specific allowance recorded, Related Allowance    
With a specific allowance recorded, Average Recorded Investment
With a specific allowance recorded, Interest Income Recognized
Total Recorded Investment    
Total Unpaid Principal Balance    
Total Related Allowance    
Total Average Recorded Investment
Total Interest Income Recognized
Residential Real Estate [Member]          
Summary of Impaired loan activity          
With no related allowance recorded, Recorded Investment 454   454   1,248
With no related allowance recorded, Unpaid Principal Balance 497   497   1,290
With no related allowance recorded, Related Allowance    
With no related allowance recorded, Average Recorded Investment 535 1,186 539 1,195 1,470
With no related allowance recorded, Interest Income Recognized 5 17 20 51 70
With a specific allowance recorded, Recorded Investment 554   554   671
With a specific allowance recorded, Unpaid Principal Balance 554   554   672
With a specific allowance recorded, Related Allowance 116   116   124
With a specific allowance recorded, Average Recorded Investment 625 945 631 957 751
With a specific allowance recorded, Interest Income Recognized 7 10 20 29 30
Total Recorded Investment 1,008   1,008   1,919
Total Unpaid Principal Balance 1,051   1,051   1,962
Total Related Allowance 116   116   124
Total Average Recorded Investment 1,160 2,131 1,170 2,152 2,221
Total Interest Income Recognized 12 27 40 80 100
Consumer & Other [Member]          
Summary of Impaired loan activity          
With no related allowance recorded, Recorded Investment 114   114   129
With no related allowance recorded, Unpaid Principal Balance 114   114   129
With no related allowance recorded, Related Allowance    
With no related allowance recorded, Average Recorded Investment 126 89 130 94 151
With no related allowance recorded, Interest Income Recognized 2 2 7 6 11
With a specific allowance recorded, Recorded Investment 87   87   119
With a specific allowance recorded, Unpaid Principal Balance 87   87   118
With a specific allowance recorded, Related Allowance 5   5   7
With a specific allowance recorded, Average Recorded Investment 92 267 95 272 123
With a specific allowance recorded, Interest Income Recognized 1 2 4 11 7
Total Recorded Investment 201   201   248
Total Unpaid Principal Balance 201   201   247
Total Related Allowance 5   5   7
Total Average Recorded Investment 218 356 225 366 274
Total Interest Income Recognized 3 4 11 17 18
All Impaired Loans less than $100,000 [Member]          
Summary of Impaired loan activity          
With no related allowance recorded, Recorded Investment 97   97   452
With no related allowance recorded, Unpaid Principal Balance 97   97   452
With no related allowance recorded, Related Allowance    
With no related allowance recorded, Average Recorded Investment 97 438 97 398 452
With no related allowance recorded, Interest Income Recognized
Total Recorded Investment 97   97   452
Total Unpaid Principal Balance 97   97   452
Total Related Allowance    
Total Average Recorded Investment 97 438 97 398 452
Total Interest Income Recognized