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Investment Securities Realized Gain (Loss) on Securities Sold (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]      
Proceeds from sales $ 53,412 $ 81,221 $ 11,135
Realized gains 7    
Realized gains   519 522
Realized losses (597)    
Realized losses   $ (143) $ (1)
Change in unrealized gain/ (loss) on equity securities reflected in the consolidated statement of operations $ (23)