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INVESTMENT SECURITIES - Investments Securities Held to Maturity (Securities in continous unrealized loss position) (Detail) - Puerto Rico [Member] - Municipal Bonds [Member] - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Schedule Of Held To Maturity Securities [Line Items]    
HTM Fair Value Less than 12 months $ 0 $ 0
HTM Unrealized Losses Less than 12 months 0 0
HTM Fair Value 12 months or more 138,389 140,732
HTM Unrealized Losses 12 months or more 11,470 13,072
HTM Fair Value 138,389 140,732
HTM Unrealized Losses $ 11,470 $ 13,072