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INVESTMENT SECURITIES - Investment Securities Held to Maturity (Securities in continuous unrealized loss position) (Detail) - Puerto Rico [Member] - Municipal Bonds [Member] - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Schedule Of Held To Maturity Securities [Line Items]
HTM Fair Value Less than 12 months	$ 0	$ 28,252
HTM Unrealized Losses Less than 12 months	0	1,611
HTM Fair Value 12 months or more	117,787	116,216
HTM Unrealized Losses 12 months or more	9,929	16,027
HTM Fair Value	117,787	144,468
HTM Unrealized Losses	$ 9,929	$ 17,638

X

- Definition

Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in continuous loss position for 12 months or longer.

+ References

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Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in unrealized loss position.

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Fair value of investment in debt security measured at amortized cost (held-to-maturity), in unrealized loss position.

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