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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