Money Market Fund [Member] Common Stock [Member] Fair Value Inputs Level1 [Member] Fair Value, Inputs, Level 1 [Member] Fair Value Inputs Level 2 [Member] Fair Value Inputs Level 3 [Member] Loans Receivable Basis Spread On Variable Rate Basis spread on variable rate Fair Value Measurements Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Axis] Investment Type Categorization [Member] Investments [Domain] Investment Type [Axis] Mutual Fund [Member] Investment Issuer Name [Axis] Investment Issuer Name [Domain] Investment, Identifier [Axis] Document And Entity Information [Abstract] Document Type Amendment Flag Document Period End Date Legal Entity [Axis] Entity [Domain] Entity [Domain] Entity Registrant Name Entity Central Index Key Entity File Number Entity Tax Identification Number EIN Employee Benefit Plan Contribution Participating Employer [Domain] Employee Benefit Plan, Contribution, Participating Employer [Domain] Employee Benefit Plan, Schedule of Asset Held for Investment [Table Text Block] Schedule of Assets Employee Benefit Plan Participant Directed Status [Domain] EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Unrealized Gain (Loss) on Investment Net appreciation in fair value of investments EBP, Investment Sold, Excluding Plan Interest in Master Trust, Selling Price Proceeds from sale of common stock Employee Benefit Plan, Payment to Participant [Policy Text Block] Payment of Benefits Employee Benefit Plan, Plan Termination [Text Block] Plan Termination Employee Benefit Plan, Net Asset Available for Benefit End of year Beginning of the year Net assets available for benefits Employee Benefit Plan Asset Held For Investment Investment Excluding Plan Interest In Master Trust Participation Status Extensible Enumeration Employee Benefit Plan, Change in Net Asset Available for Benefit, Decrease Total deductions Employee Benefit Plan Tax Determination Letter Obtained Employee Benefit Plan, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Excluding Rollover Participants Employee Benefit Plan Investment Acquired Excluding Plan Interest In Master Trust Cost Total acquisition costs Employee Benefit Plan Net Asset Available For Benefit [Abstract] Net assets available for benefits: Employee Benefit Plan, Note Receivable from Participant [Policy Text Block] Notes Receivable from Participants Forfeited Amount [Abstract] Employee Benefit Plan, Change in Net Asset Available for Benefit, Increase from Contribution Total contributions Employee Benefit Plan Asset Held For Investment Party In Interest Employee Benefit Plan, Schedule of Asset Held for Investment [Table] Employee Benefit Plan Participant Loan Maturity Date Maturity date Employee Benefit Plan, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment Net appreciation in fair value of investments Net gains Employee Benefit Plan Contribution [Policy Text Block] Contributions EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Note Receivable from Participant Interest income on notes receivable from participants Employee Benefit Plan, Note Receivable from Participant Notes receivable from participants Employee Benefit Plan Tax Determination Letter Date Employee Benefit Plan Asset Held For Investment Participant Loan After Deemed Distribution Notes receivable from participants Employee Benefit Plan, Description of Plan [Text Block] Description of the Plan Employee Benefit Plan, Asset Held for Investment Assets held EBP, Investment Sold, Excluding Plan Interest in Master Trust, Cost Number of shares purchased, market value of common stock Employee Benefit Plan, Change in Net Asset Available for Benefit, Increase Total additions Rollovers from other qualified plans Employee Benefit Plan, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover Benefits and withdrawals paid to participants, including rollover distributions Employee Benefit Plan, Change in Net Asset Available for Benefit, Decrease from Payment to Participant EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Realized Gain (Loss) on Investment Realized gains from sale of common stock Employee Benefit Plan Tax Qualification Status Extensible Enumeration Employee Benefit Plan, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment Total investment income Employee Benefit Plan, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash and Noncash Employer Employee Benefit Plan, Forfeited Nonvested Account, Decrease from Administrative Expense Forfeited nonvested account, decrease from administrative expense Employee Benefit Plan, Tax Status [Text Block] Tax Status Employee Benefit Plan Participant Directed Status [Axis] Employee Benefit Plan, Contribution, Participating Employer [Axis] Employee Benefit Plan Asset Held For Investment Investment Excluding Plan Interest In Master Trust Current Value Assets held for investment Personal Choice Retirement Account - Self-directed Brokerage Account Employee Benefit Plan, Forfeited Nonvested Account Forfeited nonvested account Employee Benefit Plan, Schedule of Asset Held for Investment [Line Items] Employee Benefit Plan, Investment, Fair Value Investments, at fair value (Note 3) Net increase in assets available for benefits Employee Benefit Plan, Change in Net Asset Available for Benefit, Increase (Decrease) Forfeited nonvested account, decrease from employer contribution Employee Benefit Plan, Forfeited Nonvested Account, Decrease from Employer Contribution Employee Benefit Plan Participant Directed [Member] Interest rate Employee Benefit Plan, Asset Held for Investment, Participant Loan, Interest Rate Interest rate Deductions from assets attributed to: Employee Benefit Plan, Change in Net Asset Available for Benefit, Decrease [Abstract] Additions to assets attributed to: Employee Benefit Plan, Change in Net Asset Available for Benefit, Increase [Abstract] Dividends and interest income Employee Benefit Plan, Change in Net Asset Available for Benefit, Increase from Interest and Dividend Income on Investment Investment income: Employee Benefit Plan, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment [Abstract] Contributions: Employee Benefit Plan, Change in Net Asset Available for Benefit, Increase from Contribution [Abstract] Investments at fair value Employee Benefit Plan, Investment, Excluding Plan Interest in Master Trust, Fair Value Employee Benefit Plan Investment Fair And Contract Value [Abstract] Investments: Administrative expenses Employee Benefit Plan, Change in Net Asset Available for Benefit, Decrease from Administrative Expense Tax Status [Abstract] Total receivables Employee Benefit Plan, Receivable Receivables: Employee Benefit Plan, Receivable [Abstract] Employee Benefit Plan, Description of Plan [Table] Employee Benefit Plan, Description of Plan [Line Items] Employee Benefit Plan, Accounting Policy [Table] Employee Benefit Plan, Accounting Policy [Line Items] Employee Benefit Plan, Tax Status [Table] Employee Benefit Plan, Tax Status [Line Items] Employee Benefit Plan, Schedule of Asset Held for Investment [Abstract] Description of the Plan [Abstract] Employee Benefit Plan, Plan Number PN Employee Benefit Plan, Risk and Uncertainty [Text Block] Risks and Uncertainties Statement of Changes in Net Assets Available for Benefits [Abstract] Employee Benefit Plan, Statement of Change in Net Asset Available for Benefit [Line Items] Employee Benefit Plan, Statement of Change in Net Asset Available for Benefit [Table] Statements of Net Asset Available for Benefits [Abstract] Employee Benefit Plan, Statement of Net Asset Available for Benefit [Line Items] Employee Benefit Plan, Statement of Net Asset Available for Benefit [Table] Employee Benefit Plan Investment Type Extensible Enumeration Employee Benefit Plan, Use of Estimate [Policy Text Block] Use of Estimates Employee Benefit Plan, Employer Contribution, Matching Percentage Employer contribution, matching percentage Employee Benefit Plan, Investment, Number of Shares Number of shares held Employee Benefit Plan, Investment, Number of Shares Purchased Number of shares purchased Employee Benefit Plan, Participant Contribution, Automatic, Deferral Rate Deferral rate of eligible employee enrolled in plan Employee Benefit Plan, Participant Contribution, Pretax, Maximum Annual Compensation to Total Compensation, Percentage Percentage participants may elect to contribute to the Plan Employee Benefit Plan Note Receivable From Participant Account Minimum Borrowing Amount Note receivable from participant account minimum borrowing amount Employee Benefit Plan, Note Receivable from Participant, Account, Maximum Borrowing, Amount Note receivable from participant, account, maximum borrowing, amount Employee Benefit Plan, Investment, Number of Shares Sold Number of shares sold Employee Benefit Plan Investment Issuer Name Extensible Enumeration Employee Benefit Plan, Employer Contribution Receivable Contributions receivable from employer Employee Benefit Plan, Participant Contribution Receivable Contributions receivable from participants Employee Benefit Plan, Investment [Policy Text Block] Investment Valuation and Income Recognition Employee Benefit Plan, Summary of Accounting Policy [Text Block] Summary of Significant Accounting Policies Employee Benefit Plan, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage Note receivable from participant, account, maximum borrowing, to total account, percentage Employee Benefit Plan Employer Contribution Participant Compensation Matched Percentage Participant compensation matched percentage Employee Benefit Plan, Participant Contribution, Pretax, Maximum Annual Compensation, Amount Maximum amount of allowable deferral contributions Party-in-Interest Transactions [Abstract] Employee Benefit Plan, Asset [Abstract] Assets Summary of Significant Accounting Policies [Abstract] Employee Benefit Plan, Related Party and Party-in-Interest Transactions [Text Block] Party-in-Interest Transactions Employee Benefit Plan, Investment, Fair Value and NAV [Line Items] Employee Benefit Plan, Investment, Fair Value and NAV [Table] Employee Benefit Plan, Investment, Fair Value and NAV [Table Text Block] Investments Measured at Fair Value Employee Benefit Plan, Basis of Accounting [Policy Text Block] Basis of Accounting Employee Benefit Plan, Investment, Fair Value and NAV [Text Block] Fair Value Measurements EBP, Noninterest-Bearing Cash Non-interest-bearing cash and cash equivalents Fair Value Measurements [Abstract] Employee Benefit Plan, Related Party and Party-in-Interest Transactions [Line Items] Employee Benefit Plan, Related Party and Party-in-Interest Transactions [Table] EBP, Plan Name Risks And Uncertainties [Abstract] Scenario Unspecified [Domain] Scenario, Unspecified [Domain] Scenario Forecast [Member] Scenario [Axis] Statistical Measurement [Axis] Range [Member] Range [Domain] Maximum [Member] Maximum [Member] Minimum [Member] Minimum [Member] Employee Benefit Plan, Plan Termination [Abstract] Plan Termination [Abstract] Employee Benefit Plan, Administration [Policy Text Block] Employee Benefit Plan, Administration [Policy Text Block] Administration Employee Benefit Plan, Period After Automatic Enrollment Applies Employee Benefit Plan, Period After Automatic Enrollment Applies Period after automatic enrollment applies Deferral Rate Increase Per Year Employee Benefit Plan, Deferral Rate Increase Per Year Deferral rate increase Employee Benefit Plan, Participant Contribution Pre-tax Maximum Annual Catch-Up Compensation Amount Employee Benefit Plan, Participant Contribution Pre-tax Maximum Annual Catch-Up Compensation Amount Catch-up compensation amount Employee Benefit Plan Participant Contribution Age For Catch-Up Contributions Employee Benefit Plan Participant Contribution Age For Catch-Up Contributions Age for catch-up contributions Employee Benefit Plan Investment Number Of Shares Sold, Market Value Of Common Stock Employee Benefit Plan Investment Number Of Shares Sold, Market Value Of Common Stock Number of shares sold, market value of common stock Employee Benefit Plan, Plan Termination, Vesting Percent In Event Of Plan Termination Employee Benefit Plan, Plan Termination, Vesting Percent In Event Of Plan Termination Vesting percent in event of plan termination EBP 002 [Member] EBP 002 [Member] EBP 004 [Member] EBP 004 [Member] Employee Benefit Plan, Forfeited Amount [Text Block] The entire disclosure for forfeited amount. Forfeited Amount Employee Benefit Plan, Rollover Distributions [Policy Text Block] Rollover Distributions Disclosure of accounting policy for rollover distributions. Mutual Funds and Money Market Funds [Member] First BanCorp. Common Stock [Member] Personal Choice Retirement Account [Member] PCRA [Member] Employee Benefit Plan, Required Service Period, Eligible To Participate In Deferral Contributions Required service period after which full-time employees are eligible to participate in deferral contributions. Required service period, eligible to participate in deferral contributions Employee Benefit Plan, Required Service Period, After Which Full-Time Employees Are Eligible To Share In Company Matching Contributions Required service period, after which full-time employees are eligible to share in company matching contributions. Required service period, eligible to share in company matching contributions. Employee Benefit Plan, Required Service Hours, Eligible To Participate In Contributions Required service hours, after which part-time employees are eligible to participate in contributions. Required service hours, eligible to participate in contributions Employee Benefit Plan, Waiver Election, Period Before Automatic Enrollment Applies Waiver election, period before automatic enrollment applies. Waiver election, period before automatic enrollment applies Employee Benefit Plan, Vesting, Required Service Period Required service period for vesting. Required service period for vesting EBP, Value Of Vested Account Benchmark EBP, Value Of Vested Account Benchmark Value of vested account benchmark Amendment [Member] EBP, Deferral Suspension Period EBP, Deferral Suspension Period Deferral suspension period EBP Administrative Fees And Other Services Incurred By Company EBP Administrative Fees And Other Services Incurred By Company Administrative fees and other services incurred by company EBP, Investment Advisory And Retirement Plan Expenses Incurred By Company EBP, Investment Advisory And Retirement Plan Expenses Incurred By Company Investment advisory and retirement plan expenses incurred by company Employee Benefit Plan Asset Held For Investment, Other Investments Employee Benefit Plan Asset Held For Investment, Other Investments Other Investments Other Investments Employee Benefit Plan Participant Age For Permitted Withdrawl Prior to Termination Employee Benefit Plan Participant Age For Permitted Withdrawl Prior to Termination Age for permitted withdrawl prior to termination Bi-Weekly Payroll [Member] Lump Sum [Member] Employee Benefit Plan Note Receivable From Participant Term Employee Benefit Plan Note Receivable From Participant Term Note receivable from participant term Home Loans, Exceeding Five Years [Member] EBP, Distributions Relating to Termination Of Service Minimum Value Required EBP, Distributions Relating to Termination Of Service Minimum Value Required Distributions relating to termination of service minimum value required First BanCorp. [Member] Cohen & Steers Realty Shares Fund Class L [Member] Dodge & Cox Global Bond Fund X [Member] Fidelity Extended Market Index Fund [Member] Fidelity International Index Fund [Member] Schwab S&P 500 Index Fund- Select S [Member] Vanguard Inflation-Protected Securities Fund [Member] Vanguard Target Retirement Income Fund [Member] Vanguard Target Retirement 2020 Fund [Member] Vanguard Target Retirement 2030 Fund [Member] Vanguard Target Retirement 2035 Fund [Member] Vanguard Target Retirement 2040 Fund [Member] Vanguard Target Retirement 2045 Fund [Member] Vanguard Target Retirement 2050 Fund [Member] Vanguard Target Retirement 2055 Fund [Member] Vanguard Target Retirement 2060 Fund [Member] Vanguard Target Retirement 2065 Fund [Member] Vanguard Total Bond Market Index Fund Institutional Shares [Member] State Street Institutional U.S. Government Money Market Fund [Member] Schwab Treasury Obligation Money Fund [Member] Vanguard Target Retirement 2025 Fund [Member] Vanguard Total Bond Market Index Fund [Member] SECURE 2.0 ACT [Member]