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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

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.

+ References

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

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Fair value of investment in debt security measured at amortized cost (held-to-maturity), in continuous unrealized loss position for less than 12 months.

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

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