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Securities (Securities With Unrealized Losses) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Less than Twelve Months, Fair Value | $ 6,900 | $ 6,947
Less than Twelve Months, Unrealized Loss | 99 | 51
Twelve Months or More, Fair Value | 3,962 | 4,470
Twelve Months or More, Unrealized Loss | 37 | 31
Total, Fair Value | 10,862 | 11,417
Total, Unrealized Loss | 136 | 82
U.S. Treasury [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than Twelve Months, Fair Value | 6,900 | 6,947
Less than Twelve Months, Unrealized Loss | 99 | 51
Twelve Months or More, Fair Value | 3,962 | 4,470
Twelve Months or More, Unrealized Loss | 37 | 31
Total, Fair Value | 10,862 | 11,417
Total, Unrealized Loss | $ 136 | $ 82

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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