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FAIR VALUE MEASUREMENT - Fair Value Option (Details) - Recurring - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Single family LHFS $ 48,994 $ 128,041
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Single family LHFS 48,994 128,041
Aggregate Unpaid Principal Balance 49,457 124,933
Fair Value Less Aggregated Unpaid Principal Balance $ (463) $ 3,108