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INVESTMENT SECURITIES - Debt Securities Held-to-Maturity by Credit Quality Indicator (Detail) - Municipal Bonds [Member] - Puerto Rico [Member] - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Schedule Of Held To Maturity Securities [Line Items]
Held to Maturity Amortized cost	$ 177,805	$ 189,488
Pass [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held to Maturity Amortized cost	177,805	189,488
Special Mention [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held to Maturity Amortized cost	0	0
Substandard [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held to Maturity Amortized cost	0	0
Doubtful [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held to Maturity Amortized cost	0	0
Loss [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held to Maturity Amortized cost	$ 0	$ 0

X

- Definition

Amount of investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26610-111562

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(6))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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+ References

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