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Fair Value of Financial Instruments (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Fair Value of Financial Instruments [Abstract]    
Increase (decrease) in fair value of securities available for sale $ 10,179 $ 639
Tax benefit (expense) of increase in the fair value of securities available for sale $ 2,379 $ 234