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FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK - Narrative (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Fair Value Disclosures [Abstract] |  |  |
Reserve in other liabilities | $ 1,500 | $ 1,000 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Reserve in other liabilities | 1,500 | 1,000 |
Off-balance sheet credit exposures expense | 511 | 39 | $ 182
MPF Program |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total outstanding balance of loans sold under the MPF Program | 18,900 | $ 26,000 |
Limited recourse back on loans | $ 777 |  |

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