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Investments (Proceeds from Sales/Calls of Available for Sale Securities and Realized Gains and Losses) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Investments [Abstract]        
Proceeds $ 5,408 $ 265 $ 5,668 $ 500
Realized gains 73 145 73 145
Realized losses $ 67 $ 10 $ 73 $ 19