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INVESTMENT SECURITIES - Investment Securities Held to Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Schedule Of Held To Maturity Securities [Line Items]
Held to Maturity Fair value	$ 168,814	$ 167,147
Allowance for credit losses, Held-to-Maturity securities	12,324	8,571
Municipal Bonds [Member] | Puerto Rico [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held to Matury Amortized Due Withing One Year	2,598	2,995
Held to Maturity Gross Unrecognized gain Due Within One Year	1	5
Held to Maturity Gross Unrecognized losses Due Within One Year	4	0
Held to Maturity Fair value Due Within One Year	2,595	3,000
Allowance for credit losses Due within one year	$ 93	$ 70
Held to Maturity Weighted-average yield Due withing One Year	5.39%	5.39%
Held to Maturity Amortized Cost After 1 to 5 years	$ 14,903	$ 14,785
Held to Maturity Gross Unrecognized gains After 1 to 5 years	541	526
Held to Maturity Gross Unrecognized losses After 1 to 5 years	151	156
Held to Maturity Fair value After 1 to 5 years	15,293	15,155
Allowance for credit losses After 1 to 5 years	$ 550	$ 347
Held to Maturity Weighted-average yield After 1 to 5 years	2.40%	2.35%
Held to Maturity Amortized Cost After 5 to 10 years	$ 90,790	$ 90,584
Held to Maturity Gross Unrecognized gains After 5 to 10 yearss	1,683	1,555
Held to Maturity Gross Unrecognized losses After 5 to 10 years	3,639	3,139
Held to Maturity Fair value After 5 to 10 years	88,834	89,000
Allowance for credit losses After 5 to 10 years	$ 6,774	$ 3,258
Held to Maturity Weighted-average yield After 5 to 10 years	4.28%	4.25%
Held to Maturity Amortized Cost After 10 years	$ 69,768	$ 69,769
Held to Maturity Gross Unrecognized gains After 10 years	0	0
Held to Maturity Gross Unrecognized losses After 10 years	7,676	9,777
Held to Maturity Fair value After 10 years	62,092	59,992
Allowance for credit losses After 10 years	$ 4,907	$ 4,896
Held to Maturity Weighted-average yield After 10 years	4.07%	4.06%
Held To Maturity Securities Amortized	$ 178,059	$ 178,133
Held to Maturity Gross Unrecognized gains	2,225	2,086
Held to Maturity Gross Unrecognized losses	11,470	13,072
Held to Maturity Fair value	168,814	167,147
Allowance for credit losses, Held-to-Maturity securities	$ 12,324	$ 8,571	$ 8,869	$ 8,845
Held to Maturity Weighted-average yield	4.06%	4.04%

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