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Allowance for Loan Losses (Schedule of Change in Allowance Methodology) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Provision for (recovery of) loan losses | $ 777 | $ (625) | $ (188)
Construction And Farmland [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Provision for (recovery of) loan losses | (15) | (634) | (469)
Residential Real Estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Provision for (recovery of) loan losses | 30 | (395) | 81
Commercial Real Estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Provision for (recovery of) loan losses | 283 | 41 | 246
Commercial [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Provision for (recovery of) loan losses | 388 | 478 | 13
Consumer [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Provision for (recovery of) loan losses | (2) | 19 | (59)
All Other Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Provision for (recovery of) loan losses | 95 | $ 51 | $ 6
Total Excluding Unallocated [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Provision for (recovery of) loan losses | 779 |  |
Calculated Provision Based on Prior Methodology [Member] | Construction And Farmland [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Provision for (recovery of) loan losses | (197) |  |
Calculated Provision Based on Prior Methodology [Member] | Residential Real Estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Provision for (recovery of) loan losses | (161) |  |
Calculated Provision Based on Prior Methodology [Member] | Commercial Real Estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Provision for (recovery of) loan losses | 140 |  |
Calculated Provision Based on Prior Methodology [Member] | Commercial [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Provision for (recovery of) loan losses | 326 |  |
Calculated Provision Based on Prior Methodology [Member] | Consumer [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Provision for (recovery of) loan losses | (7) |  |
Calculated Provision Based on Prior Methodology [Member] | All Other Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Provision for (recovery of) loan losses | 102 |  |
Calculated Provision Based on Prior Methodology [Member] | Total Excluding Unallocated [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Provision for (recovery of) loan losses | 203 |  |
Difference [Member] | Construction And Farmland [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Provision for (recovery of) loan losses | 182 |  |
Difference [Member] | Residential Real Estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Provision for (recovery of) loan losses | 191 |  |
Difference [Member] | Commercial Real Estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Provision for (recovery of) loan losses | 143 |  |
Difference [Member] | Commercial [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Provision for (recovery of) loan losses | 62 |  |
Difference [Member] | Consumer [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Provision for (recovery of) loan losses | 5 |  |
Difference [Member] | All Other Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Provision for (recovery of) loan losses | (7) |  |
Difference [Member] | Total Excluding Unallocated [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Provision for (recovery of) loan losses | $ 576 |  |

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- Definition Amount of expense related to estimated loss from loan and lease transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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