SEGMENT INFORMATION - Revenues and Selected Balance Sheet Data by Geography (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenues, Deposits, Loans and Assets by Geographic Areas [Line Items]
Revenues	$ 1,225,875	$ 1,156,180	$ 985,706
Total assets	19,292,921	18,909,549
Deposits	16,871,298	16,555,985
Puerto Rico [Member]
Revenues, Deposits, Loans and Assets by Geographic Areas [Line Items]
Revenues	1,036,757	980,371	854,587
Total assets	16,427,587	16,308,000	16,020,987
Loans	10,036,686	9,745,872	9,097,013
Deposits	13,562,227	13,429,303	12,933,570
United States [Member]
Revenues, Deposits, Loans and Assets by Geographic Areas [Line Items]
Revenues	150,226	139,329	97,788
Total assets	2,403,379	2,141,427	2,213,333
Loans	2,295,234	2,022,261	2,088,351
Deposits	1,864,772	1,631,402	1,623,725
Virgin Islands [Member]
Revenues, Deposits, Loans and Assets by Geographic Areas [Line Items]
Revenues	38,892	36,480	33,331
Total assets	461,955	460,122	400,164
Loans	429,912	424,718	379,767
Deposits	$ 1,444,299	$ 1,495,280	$ 1,586,172