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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

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