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REGULATORY MATTERS, COMMITMENTS AND CONTINGENCIES - Regulatory Capital Positions (Details) $ in Thousands | Sep. 30, 2025 USD ($) | Dec. 31, 2024 USD ($)
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First BanCorp [Member] |  |
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items] |  |
Total Capital (to Risk-Weighted Assets) Actual | $ 2,399,420 | $ 2,404,581
Total Capital (to Risk-Weighted Assets) Actual Ratio | 0.1793 | 0.1802
Total Capital (to Risk-Weighted Assets) Required For Capital Adequacy | $ 1,070,714 | $ 1,067,380
Total Capital (to Risk-Weighted Assets) Required For Capital Adequacy Ratio | 0.080 | 0.080
Common Equity Tier 1 Capital (to Risk-Weighted Assets) Actual | $ 2,231,390 | $ 2,177,748
Common Equity Tier 1 Capital (to Risk-Weighted Assets) Actual Ratio | 0.1667 | 0.1632
Common Equity Tier 1 Capital (to Risk-Weighted Assets) Required For Capital Adequacy | $ 602,277 | $ 600,401
Common Equity Tier 1 Capital (to Risk-Weighted Assets) Required For Capital Adequacy Ratio | 0.045 | 0.045
Tier 1 Capital (to Risk-Weighted Assets) Actual | $ 2,231,390 | $ 2,177,748
Tier 1 Capital (to Risk-Weighted Assets) Actual Ratio | 0.1667 | 0.1632
Tier 1 Capital (to Risk-Weighted Assets) Required For Capital Adequacy | $ 803,035 | $ 800,535
Tier 1 Capital (to Risk-Weighted Assets) Required For Capital Adequacy Ratio | 0.060 | 0.060
Leverage Ratio Actual Amount | $ 2,231,390 | $ 2,177,748
Leverage Ratio Actual Ratio | 0.1152 | 0.1107
Leverage Ratio Required For Capital Adequacy | $ 774,943 | $ 786,937
Leverage Ratio Required For Capital Adequacy Ratio | 0.040 | 0.040
FirstBank [Member] |  |
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items] |  |
Total Capital (to Risk-Weighted Assets) Actual | $ 2,338,242 | $ 2,369,441
Total Capital (to Risk-Weighted Assets) Actual Ratio | 0.1748 | 0.1776
Total Capital (to Risk-Weighted Assets) Required For Capital Adequacy | $ 1,069,894 | $ 1,067,033
Total Capital (to Risk-Weighted Assets) Required For Capital Adequacy Ratio | 0.080 | 0.080
Total Capital (to Risk-Weighted Assets) Required To Be Well Capitalized | $ 1,337,367 | $ 1,333,791
Total Capital (to Risk-Weighted Assets) Required To Be Well Capitalized Ratio | 0.100 | 0.100
Common Equity Tier 1 Capital (to Risk-Weighted Assets) Actual | $ 2,070,339 | $ 2,102,512
Common Equity Tier 1 Capital (to Risk-Weighted Assets) Actual Ratio | 0.1548 | 0.1576
Common Equity Tier 1 Capital (to Risk-Weighted Assets) Required For Capital Adequacy | $ 601,815 | $ 600,206
Common Equity Tier 1 Capital (to Risk-Weighted Assets) Required For Capital Adequacy Ratio | 0.045 | 0.045
Common Equity Tier 1 Capital (to Risk-Weighted Assets) Required To Be Well Capitalized | $ 869,289 | $ 866,964
Common Equity Tier 1 Capital (to Risk-Weighted Assets) Required To Be Well Capitalized Ratio | 0.065 | 0.065
Tier 1 Capital (to Risk-Weighted Assets) Actual | $ 2,170,339 | $ 2,202,512
Tier 1 Capital (to Risk-Weighted Assets) Actual Ratio | 0.1623 | 0.1651
Tier 1 Capital (to Risk-Weighted Assets) Required For Capital Adequacy | $ 802,420 | $ 800,275
Tier 1 Capital (to Risk-Weighted Assets) Required For Capital Adequacy Ratio | 0.060 | 0.060
Tier 1 Capital (to Risk-Weighted Assets) Required To Be Well Capitalized | $ 1,069,894 | $ 1,067,033
Tier 1 Capital (to Risk-Weighted Assets) Required To Be Well Capitalized Ratio | 0.080 | 0.080
Leverage Ratio Actual Amount | $ 2,170,339 | $ 2,202,512
Leverage Ratio Actual Ratio | 0.1120 | 0.1120
Leverage Ratio Required For Capital Adequacy | $ 775,251 | $ 786,712
Leverage Ratio Required For Capital Adequacy Ratio | 0.040 | 0.040
Leverage Ratio Required To Be Well Capitalized | $ 969,064 | $ 983,390
Leverage Ratio Required To Be Well Capitalized Ratio | 0.050 | 0.050

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