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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
Jun. 30, 2019
Dec. 31, 2018
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 123,114 125,658
Held to maturity securities twelve month or longer unrealized losses 21,558 19,157
Held to maturity unrealized loss position fair value 123,114 125,658
Held to maturity unrealized loss position aggregate losses $ 21,558 $ 19,157