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INVESTMENT SECURITIES (Tables) | 9 Months Ended
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Sep. 30, 2025
Investments, Debt and Equity Securities [Abstract] |
Schedule of Investment Securities | The amortized cost, gross unrealized gains and losses, fair value, weighted average yield and contractual maturities of the securities owned by OFG at September 30, 2025 and December 31, 2024 were as follows:
| September 30, 2025
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |  | Weighted Average Yield
| (In thousands)
Available-for-sale |  |  |  |  |  |  |  |  |
Mortgage-backed securities |  |  |  |  |  |  |  |  |
FNMA and FHLMC certificates |  |  |  |  |  |  |  |  |
Due after 10 years | $ | 2,096,291 |  |  | $ | 27,145 |  |  | $ | 37,277 |  |  | $ | 2,086,159 |  |  | 4.60 | %
GNMA certificates |  |  |  |  |  |  |  |  |
Due from 5 to 10 years | 3,155 |  |  | — |  |  | 59 |  |  | 3,096 |  |  | 1.78 | %
Due after 10 years | 492,997 |  |  | 11,321 |  |  | 31,908 |  |  | 472,410 |  |  | 3.77 | %
Total GNMA certificates | 496,152 |  |  | 11,321 |  |  | 31,967 |  |  | 475,506 |  |  | 3.76 | %
CMOs issued by US government-sponsored agencies |  |  |  |  |  |  |  |  |
Due after 10 years | 3,209 |  |  | — |  |  | 43 |  |  | 3,166 |  |  | 2.49 | %
Total mortgage-backed securities | 2,595,652 |  |  | 38,466 |  |  | 69,287 |  |  | 2,564,831 |  |  | 4.44 | %
Investment securities |  |  |  |  |  |  |  |  |
US Treasury securities |  |  |  |  |  |  |  |  |
Due less than 1 year | 1,634 |  |  | 1 |  |  | — |  |  | 1,635 |  |  | 4.13 | %
Other debt securities |  |  |  |  |  |  |  |  |
Due from 1 to 5 years | 500 |  |  | — |  |  | — |  |  | 500 |  |  | 2.35 | %
Due after 10 years | 3 |  |  | — |  |  | — |  |  | 3 |  |  | 2.97 | %
Total other debt securities | 503 |  |  | — |  |  | — |  |  | 503 |  |  | 2.35 | %
Total investment securities | 2,137 |  |  | 1 |  |  | — |  |  | 2,138 |  |  | 3.71 | %
Total securities available for sale | $ | 2,597,789 |  |  | $ | 38,467 |  |  | $ | 69,287 |  |  | $ | 2,566,969 |  |  | 4.44 | %
| September 30, 2025
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |  | Weighted Average Yield
| (In thousands)
Held-to-maturity |  |  |  |  |  |  |  |  |
Mortgage-backed securities |  |  |  |  |  |  |  |  |
FNMA and FHLMC certificates |  |  |  |  |  |  |  |  |
Due after 10 years | $ | 275,116 |  |  | $ | — |  |  | $ | 47,252 |  |  | $ | 227,864 |  |  | 1.73 | %
Other debt securities |  |  |  |  |  |  |  |  |
Due from 1 to 5 years | 35,000 |  |  | 1 |  |  | — |  |  | 35,001 |  |  | 5.27 | %
Total securities held to maturity | $ | 310,116 |  |  | $ | 1 |  |  | $ | 47,252 |  |  | $ | 262,865 |  |  | 2.13 | %
| December 31, 2024
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |  | Weighted Average Yield
| (In thousands)
Available-for-sale |  |  |  |  |  |  |  |  |
Mortgage-backed securities |  |  |  |  |  |  |  |  |
FNMA and FHLMC certificates |  |  |  |  |  |  |  |  |
Due from 1 to 5 years | $ | 14,930 |  |  | $ | — |  |  | $ | 587 |  |  | $ | 14,343 |  |  | 2.07 | %
Due from 5 to 10 years | 23,664 |  |  | — |  |  | 1,415 |  |  | 22,249 |  |  | 1.90 | %
Due after 10 years | 1,943,193 |  |  | 5,545 |  |  | 72,449 |  |  | 1,876,289 |  |  | 4.51 | %
Total FNMA and FHLMC certificates | 1,981,787 |  |  | 5,545 |  |  | 74,451 |  |  | 1,912,881 |  |  | 4.46 | %
GNMA certificates |  |  |  |  |  |  |  |  |
Due from 1 to 5 years | 6,215 |  |  | — |  |  | 177 |  |  | 6,038 |  |  | 1.74 | %
Due from 5 to 10 years | 11,358 |  |  | 10 |  |  | 641 |  |  | 10,727 |  |  | 2.25 | %
Due after 10 years | 437,308 |  |  | 4,058 |  |  | 40,146 |  |  | 401,220 |  |  | 3.63 | %
Total GNMA certificates | 454,881 |  |  | 4,068 |  |  | 40,964 |  |  | 417,985 |  |  | 3.57 | %
CMOs issued by US government-sponsored agencies |  |  |  |  |  |  |  |  |
Due from 1 to 5 years | 5,015 |  |  | — |  |  | 126 |  |  | 4,889 |  |  | 1.78 | %
Due after 10 years | 753 |  |  | — |  |  | 3 |  |  | 750 |  |  | 5.07 | %
Total CMOs issued by US government-sponsored agencies | 5,768 |  |  | — |  |  | 129 |  |  | 5,639 |  |  | 2.21 | %
Total mortgage-backed securities | 2,442,436 |  |  | 9,613 |  |  | 115,544 |  |  | 2,336,505 |  |  | 4.29 | %
Investment securities |  |  |  |  |  |  |  |  |
US Treasury securities |  |  |  |  |  |  |  |  |
Due less than 1 year | 1,149 |  |  | 1 |  |  | — |  |  | 1,150 |  |  | 4.85 | %
Other debt securities |  |  |  |  |  |  |  |  |
Due from 1 to 5 years | 550 |  |  | — |  |  | — |  |  | 550 |  |  | 2.41 | %
Total investment securities | 1,699 |  |  | 1 |  |  | — |  |  | 1,700 |  |  | 4.06 | %
Total securities available for sale | $ | 2,444,135 |  |  | $ | 9,614 |  |  | $ | 115,544 |  |  | $ | 2,338,205 |  |  | 4.29 | %
| December 31, 2024
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |  | Weighted Average Yield
| (In thousands)
Held-to-maturity |  |  |  |  |  |  |  |  |
Mortgage-backed securities |  |  |  |  |  |  |  |  |
FNMA and FHLMC certificates |  |  |  |  |  |  |  |  |
Due after 10 years | $ | 292,158 |  |  | $ | — |  |  | $ | 60,006 |  |  | $ | 232,152 |  |  | 1.73 | %
Investment securities |  |  |  |  |  |  |  |  |
Other debt securities |  |  |  |  |  |  |  |  |
Due from 1 to 5 years | 35,000 |  |  | 22 |  |  | — |  |  | 35,022 |  |  | 5.53 | %
Total securities held to maturity | $ | 327,158 |  |  | $ | 22 |  |  | $ | 60,006 |  |  | $ | 267,174 |  |  | 2.13 | %
Schedule of Gross Realized Gains and Losses by Category |
|  | Nine-Month Period Ended September 30, 2024
Description |  | Sale Price |  | Book Value at Sale |  | Gross Gains |  | Gross Losses
|  | (In thousands)
Sale of investment securities available-for-sale |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
US Treasury securities |  | $ | 149,406 |  |  | $ | 149,413 |  |  | $ | — |  |  | $ | 7 |
Schedule of Unrealized Gains and Losses by Category | The following table shows OFG’s gross unrealized losses and fair value of investment securities available-for-sale at September 30, 2025 and December 31, 2024, aggregated by investment category and the length of time that individual securities have been in a continuous unrealized loss position:
|  | September 30, 2025
|  | Less than 12 months |  | 12 months or more |  | Total
|  | Fair Value |  | Unrealized Loss |  | Fair Value |  | Unrealized Loss |  | Fair Value |  | Unrealized Loss
|  | (In thousands)
Securities available-for-sale |  |  |  |  |  |  |  |  |  |  |  |
FNMA and FHLMC certificates |  | $ | 99,560 |  |  | $ | 412 |  |  | $ | 553,694 |  |  | $ | 36,865 |  |  | $ | 653,254 |  |  | $ | 37,277 |
GNMA certificates |  | 10,010 |  |  | 301 |  |  | 225,797 |  |  | 31,666 |  |  | 235,807 |  |  | 31,967 |
CMOs issued by US government-sponsored agencies |  | — |  |  | — |  |  | 3,166 |  |  | 43 |  |  | 3,166 |  |  | 43 |
|  | $ | 109,570 |  |  | $ | 713 |  |  | $ | 782,657 |  |  | $ | 68,574 |  |  | $ | 892,227 |  |  | $ | 69,287 |
|  |  | December 31, 2024
|  |  | Less than 12 months |  |  | 12 months or more |  | Total
|  |  | Fair Value |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  | Unrealized Loss
|  |  | (In thousands)
Securities available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FNMA and FHLMC certificates |  |  | $ | 791,987 |  |  | $ | 12,989 |  |  |  | $ | 579,727 |  |  |  | $ | 61,462 |  |  |  | $ | 1,371,714 |  |  | $ | 74,451 |
GNMA certificates |  |  | 83,773 |  |  | 2,019 |  |  |  | 201,320 |  |  |  | 38,945 |  |  |  | 285,093 |  |  | 40,964 |
CMOs issued by US government-sponsored agencies |  |  | — |  |  | — |  |  |  | 5,639 |  |  |  | 129 |  |  |  | 5,639 |  |  | 129 |
|  |  | $ | 875,760 |  |  | $ | 15,008 |  |  |  | $ | 786,686 |  |  |  | $ | 100,536 |  |  |  | $ | 1,662,446 |  |  | $ | 115,544 |

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