DEBT SECURITIES - ACL on Available-for-Sale Debt Securities (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] | ||
| Beginning Balance | $ 763 | $ 521 |
| Provision for credit losses - benefit | 88 | (5) |
| Net recoveries | (12) | 0 |
| Ending Balance | 839 | 516 |
| Residential MBS [Member] | ||
| Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] | ||
| Beginning Balance | 445 | |
| Ending Balance | 531 | |
| Residential MBS [Member] | Private label [Member] | ||
| Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] | ||
| Beginning Balance | 445 | 176 |
| Provision for credit losses - benefit | 98 | 0 |
| Net recoveries | (12) | 0 |
| Ending Balance | 531 | 176 |
| Puerto Rico government obligations [Member] | ||
| Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] | ||
| Beginning Balance | 318 | 345 |
| Provision for credit losses - benefit | (10) | (5) |
| Net recoveries | 0 | 0 |
| Ending Balance | $ 308 | $ 340 |