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Loans and Allowance for Loan Losses (Impaired Loans By Class) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Dec. 31, 2017
Unpaid Principal Balance [Abstract]      
Total: $ 7,338 $ 7,338 $ 12,495
Recorded Investment [Abstract]      
Total: 6,376 6,376 11,445
Related Allowance 213 213 458
Average Recorded Investment [Abstract]      
Total: 6,400 6,521 11,642
Interest Income Recognized [Abstract]      
Total: 68 206 322
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:   1 36
Interest Income Recognized [Abstract]      
Total:   0 1
Commercial      
Unpaid Principal Balance [Abstract]      
Total: 594 594 1,221
Recorded Investment [Abstract]      
Total: 380 380 860
Related Allowance 0 0 195
Average Recorded Investment [Abstract]      
Total:   432 909
Interest Income Recognized [Abstract]      
Total:   20 40
Commercial Real Estate      
Unpaid Principal Balance [Abstract]      
Total: 1,319 1,319 1,941
Recorded Investment [Abstract]      
Total: 1,268 1,268 1,907
Related Allowance 55 55 59
Average Recorded Investment [Abstract]      
Total:   1,280 1,938
Interest Income Recognized [Abstract]      
Total:   27 72
Construction and Farmland      
Unpaid Principal Balance [Abstract]      
Total: 340 340 362
Recorded Investment [Abstract]      
Total: 290 290 316
Related Allowance 0 0 0
Average Recorded Investment [Abstract]      
Total:   301 330
Interest Income Recognized [Abstract]      
Total:   21 28
Residential Real Estate      
Unpaid Principal Balance [Abstract]      
Total: 5,084 5,084 8,937
Recorded Investment [Abstract]      
Total: 4,437 4,437 8,328
Related Allowance 158 158 195
Average Recorded Investment [Abstract]      
Total:   4,507 8,429
Interest Income Recognized [Abstract]      
Total:   138 181
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: 5,080 5,080 9,519
Recorded Investment [Abstract]      
With no related allowance: 4,348 4,348 8,728
Average Recorded Investment [Abstract]      
With no related allowance:   4,475 8,889
Interest Income Recognized [Abstract]      
With no related allowance:   138 211
With No Related Allowance [Member] | Commercial - Non Real Estate Commercial And Industrial      
Unpaid Principal Balance [Abstract]      
With no related allowance: 594 594 626
Recorded Investment [Abstract]      
With no related allowance: 380 380 304
Average Recorded Investment [Abstract]      
With no related allowance:   432 342
Interest Income Recognized [Abstract]      
With no related allowance:   20 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: 526 526 805
Recorded Investment [Abstract]      
With no related allowance: 474 474 767
Average Recorded Investment [Abstract]      
With no related allowance:   479 785
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: 340 340 362
Recorded Investment [Abstract]      
With no related allowance: 290 290 316
Average Recorded Investment [Abstract]      
With no related allowance:   301 330
Interest Income Recognized [Abstract]      
With no related allowance:   21 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:   1 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: 251 251 0
Recorded Investment [Abstract]      
With no related allowance: 59 59 0
Average Recorded Investment [Abstract]      
With no related allowance:   60 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: 3,081 3,081 7,371
Recorded Investment [Abstract]      
With no related allowance: 2,856 2,856 6,985
Average Recorded Investment [Abstract]      
With no related allowance:   2,912 7,069
Interest Income Recognized [Abstract]      
With no related allowance:   87 124
With No Related Allowance [Member] | Residential Multifamily      
Unpaid Principal Balance [Abstract]      
With no related allowance: 287 287  
Recorded Investment [Abstract]      
With no related allowance: 288 288  
Average Recorded Investment [Abstract]      
With no related allowance:   290  
Interest Income Recognized [Abstract]      
With no related allowance:   10  
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: 2,258 2,258 2,976
Recorded Investment [Abstract]      
With an allowance recorded: 2,028 2,028 2,717
Related Allowance 213 213 458
Average Recorded Investment [Abstract]      
With an allowance recorded:   2,046 2,753
Interest Income Recognized [Abstract]      
With an allowance recorded:   68 111
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: 793 793 806
Recorded Investment [Abstract]      
With an allowance recorded: 794 794 809
Related Allowance 55 55 59
Average Recorded Investment [Abstract]      
With an allowance recorded:   801 817
Interest Income Recognized [Abstract]      
With an allowance recorded:   27 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: 40 40 44
Related Allowance 40 40 44
Average Recorded Investment [Abstract]      
With an allowance recorded:   40 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: 1,248 1,248 1,349
Recorded Investment [Abstract]      
With an allowance recorded: 1,194 1,194 1,299
Related Allowance 118 118 151
Average Recorded Investment [Abstract]      
With an allowance recorded:   1,205 1,315
Interest Income Recognized [Abstract]      
With an allowance recorded:   41 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