Document and Entity Information [Abstract] Document Information [Table] Legal Entity [Axis] Entity [Domain] Represents the Retirement Plan Number 002. E B P 002 [Member] Pioneer Bank, National Association 401(k) Savings Plan Document Information [Line Items] Document Type Document Period End Date Entity Registrant Name Entity Central Index Key Amendment Flag STATEMENTS OF NET ASSETS AVAILABLE FOR BENEFITS EBP, Statement of Net Asset Available for Benefit [Table] EBP, Statement of Net Asset Available for Benefit [Line Items] STATEMENTS OF NET ASSETS AVAILABLE FOR BENEFITS EBP, Asset [Abstract] Assets EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value Investments, at fair value EBP, Note Receivable from Participant Notes receivable from participants EBP, Asset Total assets EBP, Net Asset Available for Benefit End of year Beginning of year Net Assets Available for Benefits STATEMENTS OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS EBP, Statement of Change in Net Asset Available for Benefit [Table] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] STATEMENTS OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS EBP, Change in Net Asset Available for Benefit, Increase [Abstract] Additions to net assets attributed to: No definition available. Employee Benefit Plan, Change in Net Asset Available for Benefit, Investment Income [Abstract] Investment income EBP, Change in Net Asset Available for Benefit, Increase from Interest and Dividend Income on Investment Interest and dividend income from investments EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Unrealized Gain (Loss) on Investment Net appreciation in fair value of investments Amount of increase in net asset available for benefit from investment income in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, Change in Net Asset Available for Benefit, Investment Income Total investment income EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Note Receivable from Participant Interest income on notes receivable from participants EBP, Change in Net Asset Available for Benefit, Increase from Contribution [Abstract] Contributions EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash Employer EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Excluding Rollover Participants EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover Rollovers EBP, Change in Net Asset Available for Benefit, Increase from Contribution Total contributions EBP, Change in Net Asset Available for Benefit, Increase Total additions EBP, Change in Net Asset Available for Benefit, Decrease [Abstract] Deductions from net assets attributed to: EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Benefits paid to participants EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense Administrative expenses EBP, Change in Net Asset Available for Benefit, Decrease Total deductions EBP, Change in Net Asset Available for Benefit, Increase (Decrease) Net increase in net assets available for benefits EBP, Change in Net Asset Available for Benefit, Increase (Decrease) [Abstract] Net assets available for benefits DESCRIPTION OF THE PLAN EBP, Description of Plan [Table] EBP, Description of Plan [Line Items] DESCRIPTION OF THE PLAN RIGHTS UPON PLAN TERMINATION EBP, Description of Plan [Text Block] DESCRIPTION OF THE PLAN SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES EBP, Accounting Policy [Table] EBP, Accounting Policy [Line Items] SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES EBP, Summary of Accounting Policy [Text Block] SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES No definition available RIGHTS UPON PLAN TERMINATION EBP, Plan Termination [Text Block] RIGHTS UPON PLAN TERMINATION FAIR VALUE MEASUREMENTS EBP, Investment, Fair Value and NAV [Table] EBP, Investment, Fair Value and NAV [Line Items] FAIR VALUE MEASUREMENTS EBP, Investment, Fair Value and NAV [Text Block] FAIR VALUE MEASUREMENTS PARTY-IN-INTEREST TRANSACTIONS EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Related Party and Party-in-Interest Transactions [Line Items] PARTY-IN-INTEREST TRANSACTIONS EBP, Related Party and Party-in-Interest Transactions [Text Block] PARTY-IN-INTEREST TRANSACTIONS TAX STATUS EBP, Tax Status [Table] EBP, Tax Status [Line Items] TAX STATUS EBP, Tax Status [Text Block] TAX STATUS SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) EBP, Schedule of Asset Held for Investment [Table] EBP, Schedule of Asset Held for Investment [Line Items] SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) EBP, Schedule of Asset Held for Investment [Text Block] SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) EBP, Basis of Accounting [Policy Text Block] Basis of Accounting EBP, Investment [Policy Text Block] Investment Valuation and Income Recognition EBP, Note Receivable from Participant [Policy Text Block] Notes Receivable from Participants EBP, Payment to Participant [Policy Text Block] Payment of Benefits EBP, Use of Estimate [Policy Text Block] Use of Estimates EBP, Risk and Uncertainty [Policy Text Block] Risks and Uncertainties EBP, Investment, Fair Value and NAV [Table Text Block] Schedule of investments measured at fair value on a recurring basis Represents the minimum age criteria for plan eligibility under (employee benefit plan (EBP)). Employee Benefit Plan, Minimum Age For Plan Eligibility Minimum age for Plan eligibility Represents the minimum service period for plan eligibility under (employee benefit plan (EBP)). Employee Benefit Plan, Minimum Service Period For Plan Eligibility Minimum service period for Plan eligibility Represents the minimum service period for receiving the employer contribution under (employee benefit plan (EBP)). Employee Benefit Plan, Employer Contribution, Minimum Service Period For Plan Eligibility Minimum service period for receiving employer contribution Scenario [Axis] Scenario [Domain] Represents the first portion of salary deductions. First Portion of Salary Deductions [Member] First portion of salary deductions Represents the second portion of salary deductions. Second Portion of Salary Deductions [Member] Second portion of salary deductions Statistical Measurement [Axis] Statistical Measurement [Domain] Maximum [Member] Maximum EBP, Participant Contribution, Automatic, Deferral Rate Participant's deferral rate (as a percent) EBP, Employer Contribution, Matching Percentage Employer matching contribution (as a percent) EBP, Employer Contribution, Participant Compensation Matched, Percentage Participant compensation matched (as a percent) Amount of discretionary contributions made by an employer to a defined contribution plan. Employee Benefit Plan, Employer Discretionary Contribution Amount Represents the vested period on years of vesting services for employer safe harbor contributions. Employee Benefit Plan, Employer Safe Harbor Contributions, Vesting Period Vesting period for employer safe harbor contributions Represents the vested period on years of vesting services for employer discretionary contributions. Employee Benefit Plan, Employer Discretionary Contributions, Vesting Period Vesting period for employer discretionary contributions Represents the vested percentage after second year of vesting services employer discretionary contributions. Employee Benefit Plan, Employer Discretionary Contributions, Vesting Percentage After Second Year Vesting percentage after second year for employer discretionary contributions Represents the vested percentage upon attaining normal retirement age or termination of service due to death or disability. Employee Benefit Plan, Vesting Percentage Upon Retirement, Termination Vesting percentage upon attaining normal retirement age or termination of service due to death or disability Threshold age that participant must attain for withdrawals in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, Participant Withdrawals, Threshold Age Threshold age for withdrawal EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount Note receivable, maximum borrowing amount EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage Note receivable, maximum borrowing percentage EBP, Note Receivable from Participant, Account, Minimum Borrowing, Amount Note receivable, minimum borrowing amount Represents the maximum term of loan. Employee Benefit Plan, Note Receivable From Participant, Maximum Term Maximum loan term Represents the maximum term of loan if proceeds are used for the purchase of principal residence. Employee Benefit Plan, Note Receivable From Participant, Maximum Term if Proceeds Used to Purchase Primary Residence Maximum loan term if proceeds are used for the purchase of principal residence Percentage added to reference rate used to compute variable rate on notes receivable from participants. Employee Benefit Plan, Note Receivable From Participant, Basis Spread on Variable Rate Basis spread on variable rate EBP, Note Receivable from Participant, Allowance for Credit Loss Allowance for credit losses Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] Total assets in the fair value hierarchy Fair Value, Inputs, Level 1 [Member] Level 1 Fair Value Measured at Net Asset Value Per Share [Member] Investments measured at net asset value - Common Collective Trust Investment Type [Axis] Investments [Domain] EBP, Employer, Common Stock [Member] Employer common stock Represents information pertaining to cash and money market funds. Cash And Money Market Funds [Member] Cash and Money market funds Cash Mutual Fund [Member] Mutual funds Mutual Funds Common Collective Trust [Member] Common collective trust funds EBP, Related Party and Party-in-Interest [Axis] EBP, Related Party and Party-in-Interest [Domain] Employer of participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, Employer [Member] Pioneer Bancorp, Inc. EBP, Investment, Number of Shares Number of shares owned EBP, Net Asset Value per Share or Unit Price per share owned Minimum [Member] Minimum Investment, Identifier [Axis] Entity Tax Identification Number Entity tax identification number EBP, Plan Number Plan number EBP, Investment, Issuer Name [Extensible Enumeration] EBP, Investment, Issuer Name [Extensible Enumeration] EBP, Investment, Current Value, Type [Extensible Enumeration] EBP, Investment, Current Value, Type [Extensible Enumeration] EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value Current Value EBP, Asset Held for Investment, Participant Loan, Interest Rate Interest rates of notes receivable from participants EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution Notes receivable from participants EBP, Asset Held for Investment Total Investments and Loans EBP, Asset Held for Investment, Party-in-Interest [true false] EBP, Asset Held for Investment, Party-in-Interest [true false] EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration]