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Loans and Allowance for Loan Losses (Details 4) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
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  
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
Commercial RE & Construction [Member]      
Summary of Impaired loan activity      
With no related allowance recorded, Recorded Investment 548   696
With no related allowance recorded, Unpaid Principal Balance 575   722
With no related allowance recorded, Related Allowance  
With no related allowance recorded, Average Recorded Investment 725 644 756
With no related allowance recorded, Interest Income Recognized 6 12 34
With a specific allowance recorded, Recorded Investment   689
With a specific allowance recorded, Unpaid Principal Balance   689
With a specific allowance recorded, Related Allowance   146
With a specific allowance recorded, Average Recorded Investment 788 713
With a specific allowance recorded, Interest Income Recognized (2)
Total Recorded Investment 548   1,385
Total Unpaid Principal Balance 575   1,411
Total Related Allowance   146
Total Average Recorded Investment 725 1,432 1,469
Total Interest Income Recognized 6 10 34
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 1,301   752
With no related allowance recorded, Unpaid Principal Balance 1,344   795
With no related allowance recorded, Related Allowance  
With no related allowance recorded, Average Recorded Investment 2,005 1,355 1,460
With no related allowance recorded, Interest Income Recognized 20 18 67
With a specific allowance recorded, Recorded Investment 1,066   1,078
With a specific allowance recorded, Unpaid Principal Balance 1,085   1,097
With a specific allowance recorded, Related Allowance 170   178
With a specific allowance recorded, Average Recorded Investment 613 637 628
With a specific allowance recorded, Interest Income Recognized 7 7 25
Total Recorded Investment 2,367   1,830
Total Unpaid Principal Balance 2,429   1,892
Total Related Allowance 170   178
Total Average Recorded Investment 2,618 1,992 2,088
Total Interest Income Recognized 27 25 92
Consumer & Other [Member]      
Summary of Impaired loan activity      
With no related allowance recorded, Recorded Investment 105   110
With no related allowance recorded, Unpaid Principal Balance 104   110
With no related allowance recorded, Related Allowance  
With no related allowance recorded, Average Recorded Investment 118 139 128
With no related allowance recorded, Interest Income Recognized 2 2 9
With a specific allowance recorded, Recorded Investment 85   87
With a specific allowance recorded, Unpaid Principal Balance 85   87
With a specific allowance recorded, Related Allowance 4   5
With a specific allowance recorded, Average Recorded Investment 86 167 91
With a specific allowance recorded, Interest Income Recognized 1 1 5
Total Recorded Investment 190   197
Total Unpaid Principal Balance 189   197
Total Related Allowance 4   5
Total Average Recorded Investment 204 306 219
Total Interest Income Recognized $ 3 $ 3 $ 14