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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)