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DEBT SECURITIES - ACL on Available-for-Sale Debt Securities (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]    
Beginning Balance $ 521 $ 511
Provision for credit losses - benefit (5) (69)
Ending Balance 516 442
Residential MBS [Member]    
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]    
Beginning Balance 176  
Ending Balance 176  
Residential MBS [Member] | Private label [Member]    
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]    
Beginning Balance 176 116
Provision for credit losses - benefit 0 0
Ending Balance 176 116
Puerto Rico government obligations [Member]    
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]    
Beginning Balance 345 395
Provision for credit losses - benefit (5) (69)
Ending Balance $ 340 $ 326