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Changes in Accumulated Other Comprehensive Income by Component - Additional Information (Details) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]    
Realized gains (losses) from the sale of available for sale securities $ (48) $ 62
Available-for-sale securities, tax $ 300 $ 300