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DEBT SECURITIES - ACL on Available-for-Sale Debt Securities (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]        
Beginning Balance $ 513 $ 549 $ 521 $ 511
Provision for credit losses - (benefit) expense 146 (36) 138 (45)
Net recoveries (1) 13 (1) 60
Ending Balance 658 526 658 526
Residential MBS [Member]        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]        
Beginning Balance     176  
Ending Balance 330   330  
Residential MBS [Member] | Private label [Member]        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]        
Beginning Balance 176 163 176 116
Provision for credit losses - (benefit) expense 155 0 155 0
Net recoveries (1) 13 (1) 60
Ending Balance 330 176 330 176
Puerto Rico government obligations [Member]        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]        
Beginning Balance 337 386 345 395
Provision for credit losses - (benefit) expense (9) (36) (17) (45)
Net recoveries 0 0 0 0
Ending Balance $ 328 $ 350 $ 328 $ 350