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Change in Accumulated Other Comprehensive Income (Changes To Accumulated Other Comprehensive Income By Components) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance $ 310 $ (24)
Other comprehensive (loss) income before reclassifications (3,271) (58)
Reclassification adjustments (11) (50)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax 2 17
Tax effect of current period changes 689 37
Total other comprehensive (loss) (2,593) (71)
Ending balance (2,283) (95)
Unrealized Gains And Losses On Available For Sale Securities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance 266 (63)
Other comprehensive (loss) income before reclassifications (3,271) (58)
Reclassification adjustments (11) (50)
Tax effect of current period changes 689 37
Total other comprehensive (loss) (2,593) (71)
Ending balance (2,327) (134)
Change In Benefit Obligations And Plan Assets For The Post Retirement Benefit Plan [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance 44 39
Ending balance $ 44 $ 39