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INVESTMENT SECURITIES - OTTI Losses on Available-for-Sale Debt Securities (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Debt and Equity Securities [Abstract]        
Total OTTI losses $ 0 $ 0 $ 0 $ (12,231)
Portion of OTTI recognized in OCI 0 0 0 0
Net impairment losses recognized in earnings [1] $ 0 $ 0 $ 0 $ (12,231)
[1]
Credit losses on Puerto Rico government debt securities, recorded in the first quarter of 2017.