NATURE OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Nature of Business (Details)	Dec. 31, 2024 subsidiaries offices numberofbranches
Puerto Rico [Member]
Nature Of Business [Line Items]
Number of subsidiaries | subsidiaries	6
Number of branches	57
US [Member]
Nature Of Business [Line Items]
Number of branches	8
USVI and BVI [Member]
Nature Of Business [Line Items]
Number of branches	8
First Federal Finance Corp. (MOEX) [Member] | Puerto Rico [Member]
Nature Of Business [Line Items]
Number of offices | offices	25