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Loans and Allowance for Loan Losses (Impaired Loans By Class) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Unpaid Principal Balance [Abstract]        
Total: $ 6,916 $ 6,916   $ 12,495
Recorded Investment [Abstract]        
Total: 5,970 5,970   11,445
Related Allowance 219 219   458
Average Recorded Investment [Abstract]        
Total: 6,400 6,428   11,642
Interest Income Recognized [Abstract]        
Total: 62 129   322
Consumer Installment        
Unpaid Principal Balance [Abstract]        
Total: 1 1   34
Recorded Investment [Abstract]        
Total: 1 1   34
Related Allowance 0 0   9
Average Recorded Investment [Abstract]        
Total:   2   36
Interest Income Recognized [Abstract]        
Total:   0   1
Commercial        
Unpaid Principal Balance [Abstract]        
Total: 604 604   1,221
Recorded Investment [Abstract]        
Total: 384 384   860
Related Allowance 0 0   195
Average Recorded Investment [Abstract]        
Total:   601   909
Interest Income Recognized [Abstract]        
Total:   13   40
Commercial Real Estate        
Unpaid Principal Balance [Abstract]        
Total: 1,227 1,227   1,941
Recorded Investment [Abstract]        
Total: 1,182 1,182   1,907
Related Allowance 57 57   59
Average Recorded Investment [Abstract]        
Total:   1,230   1,938
Interest Income Recognized [Abstract]        
Total:   18   72
Construction and Farmland        
Unpaid Principal Balance [Abstract]        
Total: 347 347   362
Recorded Investment [Abstract]        
Total: 298 298   316
Related Allowance 0 0   0
Average Recorded Investment [Abstract]        
Total:   347   330
Interest Income Recognized [Abstract]        
Total:   14   28
Residential Real Estate        
Unpaid Principal Balance [Abstract]        
Total: 4,737 4,737   8,937
Recorded Investment [Abstract]        
Total: 4,105 4,105   8,328
Related Allowance 162 162   195
Average Recorded Investment [Abstract]        
Total:   4,248   8,429
Interest Income Recognized [Abstract]        
Total:   84   181
All Other Loans        
Unpaid Principal Balance [Abstract]        
Total: 0 0   0
Recorded Investment [Abstract]        
Total: 0 0   0
Related Allowance 0 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: 4,647 4,647   9,519
Recorded Investment [Abstract]        
With no related allowance: 3,928 3,928   8,728
Average Recorded Investment [Abstract]        
With no related allowance:   4,337   8,889
Interest Income Recognized [Abstract]        
With no related allowance:   83   211
With No Related Allowance [Member] | Commercial - Non Real Estate Commercial And Industrial        
Unpaid Principal Balance [Abstract]        
With no related allowance: 604 604   626
Recorded Investment [Abstract]        
With no related allowance: 384 384   304
Average Recorded Investment [Abstract]        
With no related allowance:   601   342
Interest Income Recognized [Abstract]        
With no related allowance:   13   23
With No Related Allowance [Member] | Commercial Real Estate Owner Occupied        
Unpaid Principal Balance [Abstract]        
With no related allowance: 0 0   330
Recorded Investment [Abstract]        
With no related allowance: 0 0   331
Average Recorded Investment [Abstract]        
With no related allowance:   0   336
Interest Income Recognized [Abstract]        
With no related allowance:   0   15
With No Related Allowance [Member] | Commercial Real Estate Non-Owner Occupied        
Unpaid Principal Balance [Abstract]        
With no related allowance: 430 430   805
Recorded Investment [Abstract]        
With no related allowance: 383 383   767
Average Recorded Investment [Abstract]        
With no related allowance:   426   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: 347 347   362
Recorded Investment [Abstract]        
With no related allowance: 298 298   316
Average Recorded Investment [Abstract]        
With no related allowance:   347   330
Interest Income Recognized [Abstract]        
With no related allowance:   14   28
With No Related Allowance [Member] | Consumer Installment        
Unpaid Principal Balance [Abstract]        
With no related allowance: 1 1   25
Recorded Investment [Abstract]        
With no related allowance: 1 1   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: 234 234   0
Recorded Investment [Abstract]        
With no related allowance: 48 48   0
Average Recorded Investment [Abstract]        
With no related allowance:   48   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: 3,031 3,031   7,371
Recorded Investment [Abstract]        
With no related allowance: 2,814 2,814   6,985
Average Recorded Investment [Abstract]        
With no related allowance:   2,913   7,069
Interest Income Recognized [Abstract]        
With no related allowance:   56   124
With No Related Allowance [Member] | All Other Loans        
Unpaid Principal Balance [Abstract]        
With no related allowance: 0 0   0
Recorded Investment [Abstract]        
With no related allowance: 0 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: 2,269 2,269   2,976
Recorded Investment [Abstract]        
With an allowance recorded: 2,042 2,042   2,717
Related Allowance 219 219   458
Average Recorded Investment [Abstract]        
With an allowance recorded:   2,091   2,753
Interest Income Recognized [Abstract]        
With an allowance recorded:   46   111
With An Allowance Recorded [Member] | Commercial - Non Real Estate Commercial And Industrial        
Unpaid Principal Balance [Abstract]        
With an allowance recorded: 0 0   595
Recorded Investment [Abstract]        
With an allowance recorded: 0 0   556
Related Allowance 0 0   195
Average Recorded Investment [Abstract]        
With an allowance recorded:   0   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: 797 797   806
Recorded Investment [Abstract]        
With an allowance recorded: 799 799   809
Related Allowance 57 57   59
Average Recorded Investment [Abstract]        
With an allowance recorded:   804   817
Interest Income Recognized [Abstract]        
With an allowance recorded:   18   37
With An Allowance Recorded [Member] | Construction And Farmland Commercial        
Unpaid Principal Balance [Abstract]        
With an allowance recorded: 0 0   0
Recorded Investment [Abstract]        
With an allowance recorded: 0 0   0
Related Allowance 0 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: 0 0   9
Recorded Investment [Abstract]        
With an allowance recorded: 0 0   9
Related Allowance 0 0   9
Average Recorded Investment [Abstract]        
With an allowance recorded:   0 $ 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   217
Recorded Investment [Abstract]        
With an allowance recorded: 41 41   44
Related Allowance 41 41   44
Average Recorded Investment [Abstract]        
With an allowance recorded:   41   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: 1,255 1,255   1,349
Recorded Investment [Abstract]        
With an allowance recorded: 1,202 1,202   1,299
Related Allowance 121 121   151
Average Recorded Investment [Abstract]        
With an allowance recorded:   1,246   1,315
Interest Income Recognized [Abstract]        
With an allowance recorded:   28   57
With An Allowance Recorded [Member] | All Other Loans        
Unpaid Principal Balance [Abstract]        
With an allowance recorded: 0 0   0
Recorded Investment [Abstract]        
With an allowance recorded: 0 0   0
Related Allowance $ 0 0   0
Average Recorded Investment [Abstract]        
With an allowance recorded:   0   0
Interest Income Recognized [Abstract]        
With an allowance recorded:   $ 0   $ 0