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Loans and Allowance for Loan Losses (Impaired Loans By Class) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Unpaid Principal Balance [Abstract]      
Total: $ 7,724   $ 12,495
Recorded Investment [Abstract]      
Total: 6,730   11,445
Related Allowance 326   458
Average Recorded Investment [Abstract]      
Total: 6,969   11,642
Interest Income Recognized [Abstract]      
Total: 66   322
Consumer Installment      
Unpaid Principal Balance [Abstract]      
Total: 11   34
Recorded Investment [Abstract]      
Total: 11   34
Related Allowance 9   9
Average Recorded Investment [Abstract]      
Total: 11   36
Interest Income Recognized [Abstract]      
Total: 0   1
Commercial      
Unpaid Principal Balance [Abstract]      
Total: 832   1,221
Recorded Investment [Abstract]      
Total: 574   860
Related Allowance 92   195
Average Recorded Investment [Abstract]      
Total: 597   909
Interest Income Recognized [Abstract]      
Total: 7   40
Commercial Real Estate      
Unpaid Principal Balance [Abstract]      
Total: 1,924   1,941
Recorded Investment [Abstract]      
Total: 1,879   1,907
Related Allowance 58   59
Average Recorded Investment [Abstract]      
Total: 1,888   1,938
Interest Income Recognized [Abstract]      
Total: 13   72
Construction and Farmland      
Unpaid Principal Balance [Abstract]      
Total: 354   362
Recorded Investment [Abstract]      
Total: 307   316
Related Allowance 0   0
Average Recorded Investment [Abstract]      
Total: 311   330
Interest Income Recognized [Abstract]      
Total: 7   28
Residential Real Estate      
Unpaid Principal Balance [Abstract]      
Total: 4,603   8,937
Recorded Investment [Abstract]      
Total: 3,959   8,328
Related Allowance 167   195
Average Recorded Investment [Abstract]      
Total: 4,162   8,429
Interest Income Recognized [Abstract]      
Total: 39   181
All Other Loans      
Unpaid Principal Balance [Abstract]      
Total: 0   0
Recorded Investment [Abstract]      
Total: 0   0
Related Allowance 0   0
Average Recorded Investment [Abstract]      
Total: 0   0
Interest Income Recognized [Abstract]      
Total: 0   0
With No Related Allowance [Member]      
Unpaid Principal Balance [Abstract]      
With no related allowance: 5,342   9,519
Recorded Investment [Abstract]      
With no related allowance: 4,571   8,728
Average Recorded Investment [Abstract]      
With no related allowance: 4,804   8,889
Interest Income Recognized [Abstract]      
With no related allowance: 43   211
With No Related Allowance [Member] | Commercial - Non Real Estate Commercial And Industrial      
Unpaid Principal Balance [Abstract]      
With no related allowance: 740   626
Recorded Investment [Abstract]      
With no related allowance: 482   304
Average Recorded Investment [Abstract]      
With no related allowance: 505   342
Interest Income Recognized [Abstract]      
With no related allowance: 7   23
With No Related Allowance [Member] | Commercial Real Estate Owner Occupied      
Unpaid Principal Balance [Abstract]      
With no related allowance: 328   330
Recorded Investment [Abstract]      
With no related allowance: 328   331
Average Recorded Investment [Abstract]      
With no related allowance: 330   336
Interest Income Recognized [Abstract]      
With no related allowance: 4   15
With No Related Allowance [Member] | Commercial Real Estate Non-Owner Occupied      
Unpaid Principal Balance [Abstract]      
With no related allowance: 795   805
Recorded Investment [Abstract]      
With no related allowance: 747   767
Average Recorded Investment [Abstract]      
With no related allowance: 752   785
Interest Income Recognized [Abstract]      
With no related allowance: 0   20
With No Related Allowance [Member] | Construction And Farmland Commercial      
Unpaid Principal Balance [Abstract]      
With no related allowance: 354   362
Recorded Investment [Abstract]      
With no related allowance: 307   316
Average Recorded Investment [Abstract]      
With no related allowance: 311   330
Interest Income Recognized [Abstract]      
With no related allowance: 7   28
With No Related Allowance [Member] | Consumer Installment      
Unpaid Principal Balance [Abstract]      
With no related allowance: 2   25
Recorded Investment [Abstract]      
With no related allowance: 2   25
Average Recorded Investment [Abstract]      
With no related allowance: 2   27
Interest Income Recognized [Abstract]      
With no related allowance: 0   1
With No Related Allowance [Member] | Residential Equity Lines      
Unpaid Principal Balance [Abstract]      
With no related allowance: 0   0
Recorded Investment [Abstract]      
With no related allowance: 0   0
Average Recorded Investment [Abstract]      
With no related allowance: 0   0
Interest Income Recognized [Abstract]      
With no related allowance: 0   0
With No Related Allowance [Member] | Residential Single Family      
Unpaid Principal Balance [Abstract]      
With no related allowance: 3,123   7,371
Recorded Investment [Abstract]      
With no related allowance: 2,705   6,985
Average Recorded Investment [Abstract]      
With no related allowance: 2,904   7,069
Interest Income Recognized [Abstract]      
With no related allowance: 25   124
With No Related Allowance [Member] | All Other Loans      
Unpaid Principal Balance [Abstract]      
With no related allowance: 0   0
Recorded Investment [Abstract]      
With no related allowance: 0   0
Average Recorded Investment [Abstract]      
With no related allowance: 0   0
Interest Income Recognized [Abstract]      
With no related allowance: 0   0
With An Allowance Recorded [Member]      
Unpaid Principal Balance [Abstract]      
With an allowance recorded: 2,382   2,976
Recorded Investment [Abstract]      
With an allowance recorded: 2,159   2,717
Related Allowance 326   458
Average Recorded Investment [Abstract]      
With an allowance recorded: 2,165   2,753
Interest Income Recognized [Abstract]      
With an allowance recorded: 23   111
With An Allowance Recorded [Member] | Commercial - Non Real Estate Commercial And Industrial      
Unpaid Principal Balance [Abstract]      
With an allowance recorded: 92   595
Recorded Investment [Abstract]      
With an allowance recorded: 92   556
Related Allowance 92   195
Average Recorded Investment [Abstract]      
With an allowance recorded: 92   567
Interest Income Recognized [Abstract]      
With an allowance recorded: 0   17
With An Allowance Recorded [Member] | Commercial Real Estate Non-Owner Occupied      
Unpaid Principal Balance [Abstract]      
With an allowance recorded: 801   806
Recorded Investment [Abstract]      
With an allowance recorded: 804   809
Related Allowance 58   59
Average Recorded Investment [Abstract]      
With an allowance recorded: 806   817
Interest Income Recognized [Abstract]      
With an allowance recorded: 9   37
With An Allowance Recorded [Member] | Construction And Farmland Commercial      
Unpaid Principal Balance [Abstract]      
With an allowance recorded: 0   0
Recorded Investment [Abstract]      
With an allowance recorded: 0   0
Related Allowance 0   0
Average Recorded Investment [Abstract]      
With an allowance recorded: 0   0
Interest Income Recognized [Abstract]      
With an allowance recorded: 0   0
With An Allowance Recorded [Member] | Consumer Installment      
Unpaid Principal Balance [Abstract]      
With an allowance recorded: 9   9
Recorded Investment [Abstract]      
With an allowance recorded: 9   9
Related Allowance 9   9
Average Recorded Investment [Abstract]      
With an allowance recorded: 9 $ 9  
Interest Income Recognized [Abstract]      
With an allowance recorded: 0 $ 0  
With An Allowance Recorded [Member] | Residential Equity Lines      
Unpaid Principal Balance [Abstract]      
With an allowance recorded: 217   217
Recorded Investment [Abstract]      
With an allowance recorded: 43   44
Related Allowance 43   44
Average Recorded Investment [Abstract]      
With an allowance recorded: 43   45
Interest Income Recognized [Abstract]      
With an allowance recorded: 0   0
With An Allowance Recorded [Member] | Residential Single Family      
Unpaid Principal Balance [Abstract]      
With an allowance recorded: 1,263   1,349
Recorded Investment [Abstract]      
With an allowance recorded: 1,211   1,299
Related Allowance 124   151
Average Recorded Investment [Abstract]      
With an allowance recorded: 1,215   1,315
Interest Income Recognized [Abstract]      
With an allowance recorded: 14   57
With An Allowance Recorded [Member] | All Other Loans      
Unpaid Principal Balance [Abstract]      
With an allowance recorded: 0   0
Recorded Investment [Abstract]      
With an allowance recorded: 0   0
Related Allowance 0   0
Average Recorded Investment [Abstract]      
With an allowance recorded: 0   0
Interest Income Recognized [Abstract]      
With an allowance recorded: $ 0   $ 0