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INVESTMENT SECURITIES - Investment Securities (Narratives) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule Of Available For Sale Securities [Line Items]      
Proceeds From Sale Of Available For Sale Securities $ 23,408 $ 219,780 $ 0
Gain on sale of investments $ (371) $ (6,104) $ 0