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NATURE OF OPERATIONS - Mutual Holding Company Reorganization and Minority Stock Issuance (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jul. 17, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Schedule of Capitalization, Equity [Line Items] |  |  |
Net proceeds from sale of stock |  |  | $ 109,055,000
Stock contributed to Pioneer Bank Charitable Foundation (in shares) | 519,554 |  |
Cash contributed to Pioneer Bank Charitable Foundation | $ 250,000 |  |
Initial Public Offering |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |
Sale of stock (in shares) | 11,170,402 |  |
Share price | $ 10.00 |  |
Net proceeds from sale of stock | $ 109,100,000 |  |
Pioneer Bank ESOP |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |
Numbers of shares owned by ESOP |  | 1,018,325 | 1,018,325
Pioneer Bancorp, MHC |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |
Sale of stock (in shares) | 14,287,723 |  |
Ownership interest (as a percent) |  | 55.00% |

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