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Securities - Summary of Proceeds From Sales of Securities Available-for-sale and Associated Gains and Losses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Available For Sale Securities Gross Realized Gain Loss [Abstract]      
Proceeds $ 8 $ 534,418 $ 511,028
Gross gains $ 8 3,358 3,124
Gross losses   $ 131 $ 60