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Other Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Pre-Tax Amount [Member] |  |
Schedule Of Other Comprehesive Income [Line Items] |  |
Unrealized Net Holding Gain (Loss) On All Other Securitiies | $ 417 | $ (4,412)
Reclassification adjustment for loss (gain) on securities recognized in earnings | (51) | 221
Other Comprehensive Income (Loss) | 366 | (4,191)
Tax Benefit (Expense) [Member] |  |
Schedule Of Other Comprehesive Income [Line Items] |  |
Unrealized Net Holding Gain (Loss) On All Other Securitiies | (154) | 1,628
Reclassification adjustment for loss (gain) on securities recognized in earnings | 19 | (82)
Other Comprehensive Income (Loss) | (135) | 1,546
Net Of Tax Amount [Member] |  |
Schedule Of Other Comprehesive Income [Line Items] |  |
Unrealized Net Holding Gain (Loss) On All Other Securitiies | 263 | (2,784)
Reclassification adjustment for loss (gain) on securities recognized in earnings | (32) | 139
Other Comprehensive Income (Loss) | $ 231 | $ (2,645)

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