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REGULATORY MATTERS, COMMITMENTS AND CONTINGENCIES - Regulatory capital positions (Detail) $ in Thousands | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
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First BanCorp [Member] |  |
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items] |  |
Total Capital (to Risk-Weighted Assets) Actual | $ 2,388,964 | $ 2,403,319
Total Capital (to Risk-Weighted Assets) Actual Ratio | 0.1836 | 0.1857
Total Capital (to Risk-Weighted Assets) Required For Capital Adequacy | $ 1,040,707 | $ 1,035,589
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 | $ 2,068,978 | $ 2,084,432
Common Equity Tier 1 Capital (to Risk-Weighted Assets) Actual Ratio | 0.1590 | 0.1610
Common Equity Tier 1 Capital (to Risk-Weighted Assets) Required For Capital Adequacy | $ 585,398 | $ 528,519
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 | $ 2,068,978 | $ 2,084,432
Tier 1 Capital (to Risk-Weighted Assets) Actual Ratio | 0.1590 | 0.1610
Tier 1 Capital (to Risk-Weighted Assets) Required For Capital Adequacy | $ 780,531 | $ 776,692
Tier 1 Capital (to Risk-Weighted Assets) Required For Capital Adequacy Ratio | 0.060 | 0.060
Leverage Ratio Actual Amount | $ 2,068,978 | $ 2,084,432
Leverage Ratio Actual Ratio | 0.1065 | 0.1078
Leverage Ratio Required For Capital Adequacy | $ 777,406 | $ 773,615
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 | $ 2,360,406 | $ 2,376,003
Total Capital (to Risk-Weighted Assets) Actual Ratio | 0.1815 | 0.1836
Total Capital (to Risk-Weighted Assets) Required For Capital Adequacy | $ 1,040,576 | $ 1,035,406
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 | $ 1,300,720 | $ 1,294,257
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 | $ 2,097,291 | $ 2,113,995
Common Equity Tier 1 Capital (to Risk-Weighted Assets) Actual Ratio | 0.1612 | 0.1633
Common Equity Tier 1 Capital (to Risk-Weighted Assets) Required For Capital Adequacy | $ 585,324 | $ 582,416
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 | $ 845,468 | $ 841,267
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 | $ 2,197,291 | $ 2,213,995
Tier 1 Capital (to Risk-Weighted Assets) Actual Ratio | 0.1689 | 0.1711
Tier 1 Capital (to Risk-Weighted Assets) Required For Capital Adequacy | $ 780,432 | $ 776,554
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 | $ 1,040,576 | $ 1,035,406
Tier 1 Capital (to Risk-Weighted Assets) Required To Be Well Capitalized Ratio | 0.080 | 0.080
Leverage Ratio Actual Amount | $ 2,197,291 | $ 2,213,995
Leverage Ratio Actual Ratio | 0.1131 | 0.1145
Leverage Ratio Required For Capital Adequacy | $ 777,103 | $ 773,345
Leverage Ratio Required For Capital Adequacy Ratio | 0.040 | 0.040
Leverage Ratio Required To Be Well Capitalized | $ 971,379 | $ 966,682
Leverage Ratio Required To Be Well Capitalized Ratio | 0.050 | 0.050

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