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INVESTMENT SECURITIES - Investment Securities Held to Maturity (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Schedule Of Held To Maturity Securities [Line Items]
Held to Maturity Fair value	$ 170,438		$ 173,806
Allowance for Credit Losse, Held-to-maturity securities	8,317		8,845
Municipal Bonds [Member] | Puerto Rico [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held to Matury Amortized Due Withing One Year	2,993		556
Held to Maturity Gross Unrecognized gain Due Within One Year	8		7
Held to Maturity Gross Unrecognized losses Due Within One Year	19		0
Held to Maturity Fair value Due Within One Year	2,982		563
Allowance for credit losses Withing One Year	$ 59		$ 0
Held to Maturity Weighted-average yield Due withing One Year	5.39%		5.41%
Held to Maturity Amortized Cost After 1 to 5 years	$ 14,667		$ 17,297
Held to Maturity Gross Unrecognized gains After 1 to 5 years	615		561
Held to Maturity Gross Unrecognized losses After 1 to 5 years	178		305
Held to Maturity Fair value After 1 to 5 years	15,104		17,553
Allowance for credit losses After 1 to 5 years	$ 268		$ 576
Held to Maturity Weighted-average yield After 1 to 5 years	2.36%		3.00%
Held to Maturity Amortized Cost After 5 to 10 years	$ 90,377		$ 88,394
Held to Maturity Gross Unrecognized gains After 5 to 10 years	1,939		1,388
Held to Maturity Gross Unrecognized losses After 5 to 10 year	1,470		3,146
Held to Maturity Fair value After 5 to 10 years	90,846		86,636
Allowance for credit losses After 5 to 10 years	$ 3,013		$ 4,401
Held to Maturity Weighted-average yield After 5 to 10 years	4.26%		4.66%
Held to Maturity Weighted-average yield	4.05%		4.03%
Held to Maturity Amortized Cost After 10 years	$ 69,768		$ 83,241
Held to Maturity Gross Unrecognized gains After 10	0		0
Held to Maturity Gross Unrecognized losses After 10	8,262		14,187
Held to Maturity Fair value After 10 years	61,506		69,054
Allowance for credit losses After 10 years	$ 4,977		$ 3,868
Held to Maturity Weighted-average yield After 10 years	4.07%		3.57%
Held to Maturity Amortized cost	$ 177,805		$ 189,488
Held to Maturity Gross Unrecognized gains	2,562		1,956
Held to Maturity Fair value	170,438		173,806
Allowance for Credit Losse, Held-to-maturity securities	8,317	$ 10,685	8,845	$ 10,176	$ 9,268	$ 0
Held to Maturity Gross Unrecognized losses	$ 9,929		$ 17,638

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Fair value of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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- Definition

Amount of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

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

+ References

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- Definition

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+ References

No definition available.

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