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FAIR VALUE MEASUREMENT - Schedule of Level 3 Unobservable Inputs (Details)
$ in Thousands
Sep. 30, 2024
USD ($)
Jun. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Sep. 30, 2023
USD ($)
Jun. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Investment securities AFS $ 1,117,551   $ 1,251,199      
Interest rate lock commitments            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Interest rate lock commitments, net 596 $ 483 411 $ (75) $ 79 $ 105
Recurring            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Single family LHFI 1,329   1,280      
Recurring | Level 3            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Single family LHFI 1,329   1,280      
Recurring | Level 3 | Investment securities AFS            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Investment securities AFS 1,804   1,860      
Recurring | Level 3 | Single family LHFI            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Single family LHFI 1,329   1,280      
Recurring | Level 3 | Interest rate lock commitments            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Interest rate lock commitments, net $ 596   $ 411      
Implied spread to benchmark interest rate curve | Low | Recurring | Level 3 | Investment securities AFS            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Implied spread to benchmark interest rate curve 0.0225   0.0225      
Implied spread to benchmark interest rate curve | Low | Recurring | Level 3 | Single family LHFI            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Implied spread to benchmark interest rate curve 0.0285   0.0330      
Implied spread to benchmark interest rate curve | High | Recurring | Level 3 | Investment securities AFS            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Implied spread to benchmark interest rate curve 0.0225   0.0225      
Implied spread to benchmark interest rate curve | High | Recurring | Level 3 | Single family LHFI            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Implied spread to benchmark interest rate curve 0.0559   0.0504      
Implied spread to benchmark interest rate curve | Weighted Average | Recurring | Level 3 | Investment securities AFS            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Implied spread to benchmark interest rate curve 0.0225   0.0225      
Implied spread to benchmark interest rate curve | Weighted Average | Recurring | Level 3 | Single family LHFI            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Implied spread to benchmark interest rate curve 0.0364   0.0394      
Fall-out factor | Low | Recurring | Level 3 | Interest rate lock commitments            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Fall-out factor, Value of servicing 0.0060   0.0081      
Fall-out factor | High | Recurring | Level 3 | Interest rate lock commitments            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Fall-out factor, Value of servicing 0.4179   0.4164      
Fall-out factor | Weighted Average | Recurring | Level 3 | Interest rate lock commitments            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Fall-out factor, Value of servicing 0.1032   0.1054      
Value of servicing | Low | Recurring | Level 3 | Interest rate lock commitments            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Fall-out factor, Value of servicing 0.0065   0.0032      
Value of servicing | High | Recurring | Level 3 | Interest rate lock commitments            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Fall-out factor, Value of servicing 0.0189   0.0080      
Value of servicing | Weighted Average | Recurring | Level 3 | Interest rate lock commitments            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Fall-out factor, Value of servicing 0.0116   0.0057