DEBT SECURITIES - Investment Securities Held to Maturity (Detail) - USD ($)	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Schedule Of Held To Maturity Securities [Line Items]
Held To Maturity Securities Amortized	$ 458,227,000
Held to Maturity Gross Unrecognized gains	3,449,000
Held to Maturity Gross Unrecognized losses	8,434,000
Held to Maturity Fair value	453,242,000		$ 167,147,000
Allowance for credit losses, Held-to-Maturity securities	$ 8,885,000		8,571,000
Held to Maturity Weighted-average yield	3.68%
Mortgage Backed Securities [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held To Maturity Securities Amortized	$ 279,812,000
Held to Maturity Gross Unrecognized gains	334,000
Held to Maturity Gross Unrecognized losses	1,923,000
Held to Maturity Fair value	278,223,000
Allowance for credit losses, Held-to-Maturity securities	$ 0
Held to Maturity Weighted-average yield	3.23%
Municipal Bonds [Member] | Puerto Rico [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held to Matury Amortized Due Withing One Year	$ 595,000		2,995,000
Held to Maturity Gross Unrecognized gain Due Within One Year	0		5,000
Held to Maturity Gross Unrecognized losses Due Within One Year	0		0
Held to Maturity Fair value Due Within One Year	595,000		3,000,000
Allowance for credit losses Due within one year	$ 1,000		$ 70,000
Held to Maturity Weighted-average yield Due withing One Year	5.45%		5.39%
Held to Maturity Amortized Cost After 1 to 5 years	$ 15,021,000		$ 14,785,000
Held to Maturity Gross Unrecognized gains After 1 to 5 years	658,000		526,000
Held to Maturity Gross Unrecognized losses After 1 to 5 years	44,000		156,000
Held to Maturity Fair value After 1 to 5 years	15,635,000		15,155,000
Allowance for credit losses After 1 to 5 years	$ 175,000		$ 347,000
Held to Maturity Weighted-average yield After 1 to 5 years	2.98%		2.35%
Held to Maturity Amortized Cost After 5 to 10 years	$ 93,031,000		$ 90,584,000
Held to Maturity Gross Unrecognized gains After 5 to 10 yearss	2,457,000		1,555,000
Held to Maturity Gross Unrecognized losses After 5 to 10 years	2,286,000		3,139,000
Held to Maturity Fair value After 5 to 10 years	93,202,000		89,000,000
Allowance for credit losses After 5 to 10 years	$ 3,411,000		$ 3,258,000
Held to Maturity Weighted-average yield After 5 to 10 years	4.64%		4.25%
Held to Maturity Amortized Cost After 10 years	$ 69,768,000		$ 69,769,000
Held to Maturity Gross Unrecognized gains After 10 years	0		0
Held to Maturity Gross Unrecognized losses After 10 years	4,181,000		9,777,000
Held to Maturity Fair value After 10 years	65,587,000		59,992,000
Allowance for credit losses After 10 years	$ 5,298,000		$ 4,896,000
Held to Maturity Weighted-average yield After 10 years	4.35%		4.06%
Held To Maturity Securities Amortized	$ 178,415,000		$ 178,133,000
Held to Maturity Gross Unrecognized gains	3,115,000		2,086,000
Held to Maturity Gross Unrecognized losses	6,511,000		13,072,000
Held to Maturity Fair value	175,019,000		167,147,000
Allowance for credit losses, Held-to-Maturity securities	$ 8,885,000	$ 12,324,000	$ 8,571,000	$ 10,685,000	$ 8,869,000	$ 8,845,000
Held to Maturity Weighted-average yield	4.39%		4.04%
FHLMC [Member] | Mortgage Backed Securities [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held to Maturity Amortized Cost After 5 to 10 years	$ 24,398,000
Held to Maturity Gross Unrecognized gains After 5 to 10 yearss	8,000
Held to Maturity Gross Unrecognized losses After 5 to 10 years	0
Held to Maturity Fair value After 5 to 10 years	24,406,000
Allowance for credit losses After 5 to 10 years	$ 0
Held to Maturity Weighted-average yield After 5 to 10 years	3.04%
Held to Maturity Amortized Cost After 10 years	$ 20,211,000
Held to Maturity Gross Unrecognized gains After 10 years	0
Held to Maturity Gross Unrecognized losses After 10 years	84,000
Held to Maturity Fair value After 10 years	20,127,000
Allowance for credit losses After 10 years	$ 0
Held to Maturity Weighted-average yield After 10 years	4.39%
Held To Maturity Securities Amortized	$ 44,609,000
Held to Maturity Gross Unrecognized gains	8,000
Held to Maturity Gross Unrecognized losses	84,000
Held to Maturity Fair value	44,533,000
Allowance for credit losses, Held-to-Maturity securities	$ 0
Held to Maturity Weighted-average yield	3.65%
GNMA [Member] | Mortgage Backed Securities [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held to Maturity Amortized Cost After 10 years	$ 20,657,000
Held to Maturity Gross Unrecognized gains After 10 years	0
Held to Maturity Gross Unrecognized losses After 10 years	121,000
Held to Maturity Fair value After 10 years	20,536,000
Allowance for credit losses After 10 years	$ 0
Held to Maturity Weighted-average yield After 10 years	3.38%
FNMA [Member] | Mortgage Backed Securities [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held to Maturity Amortized Cost After 10 years	$ 75,530,000
Held to Maturity Gross Unrecognized gains After 10 years	326,000
Held to Maturity Gross Unrecognized losses After 10 years	242,000
Held to Maturity Fair value After 10 years	75,614,000
Allowance for credit losses After 10 years	$ 0
Held to Maturity Weighted-average yield After 10 years	2.90%
Collateralized Mortgage Obligations [Member] | Mortgage Backed Securities [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held to Maturity Amortized Cost After 10 years	$ 139,016,000
Held to Maturity Gross Unrecognized gains After 10 years	0
Held to Maturity Gross Unrecognized losses After 10 years	1,476,000
Held to Maturity Fair value After 10 years	137,540,000
Allowance for credit losses After 10 years	$ 0
Held to Maturity Weighted-average yield After 10 years	3.25%