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FAIR VALUE MEASUREMENT - Narrative (Details) - USD ($)
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Transfers between levels of fair value hierarchy $ 0 $ 0  
Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Single family LHFI 6,981,000   $ 7,287,000
Level 3 | Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Single family LHFI $ 6,981,000   $ 7,287,000