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Fair Value of Financial Instruments (Unrealized Gains (Losses) On Available-for-sale Securities In OCI) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Fair Value of Financial Instruments [Abstract]        
Unrealized gains (losses) on available-for-sale securities $ 108 $ (95) $ 49 $ (371)
Unrealized gains (losses) on available-for-sale securities, net of tax $ 82 $ (58) $ (19) $ (240)