INVESTMENT SECURITIES - Investment Securities Held to Maturity (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule Of Held To Maturity Securities [Line Items]
Held to Maturity Fair value	$ 167,147	$ 173,806
Allowance for credit losses, Held-to-Maturity securities	8,571	8,845
Municipal Bonds [Member] | Puerto Rico [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held to Matury Amortized Due Withing One Year	2,995	556
Held to Maturity Gross Unrecognized gain Due Within One Year	5	7
Held to Maturity Gross Unrecognized losses Due Within One Year	0	0
Held to Maturity Fair value Due Within One Year	3,000	563
Allowance for credit losses Due within one year	$ 70	$ 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	$ 14,785	$ 17,297
Held to Maturity Gross Unrecognized gains After 1 to 5 years	526	561
Held to Maturity Gross Unrecognized losses After 1 to 5 years	156	305
Held to Maturity Fair value After 1 to 5 years	15,155	17,553
Allowance for credit losses After 1 to 5 years	$ 347	$ 576
Held to Maturity Weighted-average yield After 1 to 5 years	2.35%	3.00%
Held to Maturity Amortized Cost After 5 to 10 years	$ 90,584	$ 88,394
Held to Maturity Gross Unrecognized gains After 5 to 10 yearss	1,555	1,388
Held to Maturity Gross Unrecognized losses After 5 to 10 years	3,139	3,146
Held to Maturity Fair value After 5 to 10 years	89,000	86,636
Allowance for credit losses After 5 to 10 years	$ 3,258	$ 4,401
Held to Maturity Weighted-average yield After 5 to 10 years	4.25%	4.66%
Held to Maturity Amortized Cost After 10 years	$ 69,769	$ 83,241
Held to Maturity Gross Unrecognized gains After 10 years	0	0
Held to Maturity Gross Unrecognized losses After 10 years	9,777	14,187
Held to Maturity Fair value After 10 years	59,992	69,054
Allowance for credit losses After 10 years	$ 4,896	$ 3,868
Held to Maturity Weighted-average yield After 10 years	4.06%	3.57%
Held To Maturity Securities Amortized	$ 178,133	$ 189,488
Held to Maturity Gross Unrecognized gains	2,086	1,956
Held to Maturity Gross Unrecognized losses	13,072	17,638
Held to Maturity Fair value	167,147	173,806
Allowance for credit losses, Held-to-Maturity securities	$ 8,571	$ 8,845	$ 0
Held to Maturity Weighted-average yield	4.04%	4.03%