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DEBT SECURITIES - Investment Securities Held to Maturity (Detail) - USD ($) $ in Thousands	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Schedule Of Held To Maturity Securities [Line Items]
Held To Maturity Securities Amortized	$ 424,726		$ 437,537
Held to Maturity Gross Unrecognized gains	3,394		4,068
Held to Maturity Gross Unrecognized losses	17,939		14,490
Held to Maturity Fair value	410,181		427,115
Allowance for credit losses, Held-to-Maturity securities	$ 8,401		$ 8,286
Held to Maturity Weighted-average yield	5.20%		4.71%
Held to maturity accrued interest receivable excluded from estimate of credit losses	$ 6,800		$ 5,500
Residential MBS [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held To Maturity Securities Amortized	155,690		166,739
Held to Maturity Gross Unrecognized gains	0		0
Held to Maturity Gross Unrecognized losses	7,974		7,156
Held to Maturity Fair value	147,716		159,583
Allowance for credit losses, Held-to-Maturity securities	$ 0		$ 0
Held to Maturity Weighted-average yield	3.83%		3.78%
Commercial MBS [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held to Maturity Amortized Cost After 1 to 5 years	$ 9,533		$ 9,621
Held to Maturity Gross Unrecognized gains After 1 to 5 years	0		0
Held to Maturity Gross Unrecognized losses After 1 to 5 years	479		396
Held to Maturity Fair value After 1 to 5 years	9,054		9,225
Allowance for credit losses After 1 to 5 years	$ 0		$ 0
Held to Maturity Weighted-average yield After 1 to 5 years	3.48%		3.48%
Held to Maturity Amortized Cost After 10 years	$ 93,379		$ 95,467
Held to Maturity Gross Unrecognized gains After 10 years	0		0
Held to Maturity Gross Unrecognized losses After 10 years	5,628		4,169
Held to Maturity Fair value After 10 years	87,751		91,298
Allowance for credit losses After 10 years	$ 0		$ 0
Held to Maturity Weighted-average yield After 10 years	3.15%		3.15%
Held To Maturity Securities Amortized	$ 102,912		$ 105,088
Held to Maturity Gross Unrecognized gains	0		0
Held to Maturity Gross Unrecognized losses	6,107		4,565
Held to Maturity Fair value	96,805		100,523
Allowance for credit losses, Held-to-Maturity securities	$ 0		$ 0
Held to Maturity Weighted-average yield	3.18%		3.18%
MBS [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held To Maturity Securities Amortized	$ 258,602		$ 271,827
Held to Maturity Gross Unrecognized gains	0		0
Held to Maturity Gross Unrecognized losses	14,081		11,721
Held to Maturity Fair value	244,521		260,106
Allowance for credit losses, Held-to-Maturity securities	$ 0		$ 0
Held to Maturity Weighted-average yield	3.57%		3.55%
Municipal Bonds [Member] | Puerto Rico [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held to Maturity Amortized Due Withing One Year	$ 1,205		$ 1,202
Held to Maturity Gross Unrecognized gain Due Within One Year	0		0
Held to Maturity Gross Unrecognized losses Due Within One Year	29		15
Held to Maturity Fair value Due Within One Year	1,176		1,187
Allowance for credit losses Due within one year	$ 26		$ 2
Held to Maturity Weighted-average yield Due withing One Year	5.90%		5.20%
Held to Maturity Amortized Cost After 1 to 5 years	$ 42,736		$ 42,530
Held to Maturity Gross Unrecognized gains After 1 to 5 years	661		886
Held to Maturity Gross Unrecognized losses After 1 to 5 years	1,360		1,076
Held to Maturity Fair value After 1 to 5 years	42,037		42,340
Allowance for credit losses After 1 to 5 years	$ 689		$ 656
Held to Maturity Weighted-average yield After 1 to 5 years	6.93%		6.34%
Held to Maturity Amortized Cost After 5 to 10 years	$ 56,160		$ 55,956
Held to Maturity Gross Unrecognized gains After 5 to 10 years	2,733		3,182
Held to Maturity Gross Unrecognized losses After 5 to 10 years	446		360
Held to Maturity Fair value After 5 to 10 years	58,447		58,778
Allowance for credit losses After 5 to 10 years	$ 3,209		$ 3,243
Held to Maturity Weighted-average yield After 5 to 10 years	7.44%		6.29%
Held to Maturity Amortized Cost After 10 years	$ 66,023		$ 66,022
Held to Maturity Gross Unrecognized gains After 10 years	0		0
Held to Maturity Gross Unrecognized losses After 10 years	2,023		1,318
Held to Maturity Fair value After 10 years	64,000		64,704
Allowance for credit losses After 10 years	$ 4,477		$ 4,385
Held to Maturity Weighted-average yield After 10 years	8.54%		7.10%
Held To Maturity Securities Amortized	$ 166,124		$ 165,710
Held to Maturity Gross Unrecognized gains	3,394		4,068
Held to Maturity Gross Unrecognized losses	3,858		2,769
Held to Maturity Fair value	165,660		167,009
Allowance for credit losses, Held-to-Maturity securities	$ 8,401	$ 7,646	$ 8,286	$ 8,885	$ 12,324	$ 8,571
Held to Maturity Weighted-average yield	7.74%		6.62%
FHLMC [Member] | Residential MBS [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held to Maturity Amortized Cost After 5 to 10 years	$ 18,836		$ 21,443
Held to Maturity Gross Unrecognized gains After 5 to 10 years	0		0
Held to Maturity Gross Unrecognized losses After 5 to 10 years	1,203		746
Held to Maturity Fair value After 5 to 10 years	17,633		20,697
Allowance for credit losses After 5 to 10 years	$ 0		$ 0
Held to Maturity Weighted-average yield After 5 to 10 years	3.03%		3.03%
Held to Maturity Amortized Cost After 10 years	$ 18,936		$ 19,362
Held to Maturity Gross Unrecognized gains After 10 years	0		0
Held to Maturity Gross Unrecognized losses After 10 years	906		888
Held to Maturity Fair value After 10 years	18,030		18,474
Allowance for credit losses After 10 years	$ 0		$ 0
Held to Maturity Weighted-average yield After 10 years	4.33%		4.21%
Held To Maturity Securities Amortized	$ 37,772		$ 40,805
Held to Maturity Gross Unrecognized gains	0		0
Held to Maturity Gross Unrecognized losses	2,109		1,634
Held to Maturity Fair value	35,663		39,171
Allowance for credit losses, Held-to-Maturity securities	$ 0		$ 0
Held to Maturity Weighted-average yield	3.68%		3.59%
GNMA [Member] | Residential MBS [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held to Maturity Amortized Cost After 10 years	$ 17,765		$ 19,131
Held to Maturity Gross Unrecognized gains After 10 years	0		0
Held to Maturity Gross Unrecognized losses After 10 years	1,046		943
Held to Maturity Fair value After 10 years	16,719		18,188
Allowance for credit losses After 10 years	$ 0		$ 0
Held to Maturity Weighted-average yield After 10 years	3.35%		3.35%
FNMA [Member] | Residential MBS [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held to Maturity Amortized Cost After 10 years	$ 69,956		$ 72,347
Held to Maturity Gross Unrecognized gains After 10 years	0		0
Held to Maturity Gross Unrecognized losses After 10 years	3,161		3,155
Held to Maturity Fair value After 10 years	66,795		69,192
Allowance for credit losses After 10 years	$ 0		$ 0
Held to Maturity Weighted-average yield After 10 years	4.17%		4.14%
CMOs issued or guaranteed by the FHLMC, FNMA, and GNMA: [Member] | Residential MBS [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held to Maturity Amortized Cost After 10 years	$ 30,197		$ 34,456
Held to Maturity Gross Unrecognized gains After 10 years	0		0
Held to Maturity Gross Unrecognized losses After 10 years	1,658		1,424
Held to Maturity Fair value After 10 years	28,539		33,032
Allowance for credit losses After 10 years	$ 0		$ 0
Held to Maturity Weighted-average yield After 10 years	3.49%		3.49%

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Weighted average yield of investment in debt security measured at amortized cost (held-to-maturity) maturing after tenth 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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