SEGMENT INFORMATION - Revenues and Selected Balance Sheet Data by Geography Based on the Location (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Total revenues	$ 1,156,180	$ 985,706	$ 915,872
Total assets	18,909,549	18,634,484
Loans held for investment	12,185,483	11,552,825
Deposits	16,555,985	16,143,467
Brokered certificates of deposits ("CDs")	783,334	105,826
Puerto Rico [Member]
Segment Reporting Information [Line Items]
Total revenues	981,328	855,441	795,166
Total assets	16,308,000	16,020,987	18,175,910
Loans held for investment	9,745,872	9,097,013	8,755,434
Deposits	13,429,303	12,933,570	14,113,874
Brokered certificates of deposits ("CDs")	420,200	1,400	34,200
United States [Member]
Segment Reporting Information [Line Items]
Total revenues	139,187	97,642	86,157
Total assets	2,141,427	2,213,333	2,189,440
Loans held for investment	2,022,261	2,088,351	1,948,716
Deposits	1,631,402	1,623,725	1,928,749
Brokered certificates of deposits ("CDs")	363,100	104,400	66,200
Virgin Islands [Member]
Segment Reporting Information [Line Items]
Total revenues	35,665	32,623	34,549
Total assets	460,122	400,164	419,925
Loans held for investment	424,718	379,767	391,663
Deposits	$ 1,495,280	$ 1,586,172	$ 1,742,271