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INVESTMENT SECURITIES - Investment Securities Held to Maturity (Securities in continuous unrealized loss position) (Detail) - PUERTO RICO - Municipal Bonds [Member] - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Schedule Of Held To Maturity Securities [Line Items]    
Held to maturity less than twelve months fair value $ 0 $ 0
Held to maturity less than twelve months unrealized losses 0 0
Held to maturity securities twelve months or longer fair value 131,703 131,032
Held to maturity securities twelve month or longer unrealized losses 13,096 19,595
Held to maturity unrealized loss position fair value 131,703 131,032
Held to maturity unrealized loss position aggregate losses $ 13,096 $ 19,595