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FAIR VALUE MEASUREMENT - Schedule of Level 3 Unobservable Inputs (Details)
$ in Thousands
Sep. 30, 2023
USD ($)
Jun. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Sep. 30, 2022
USD ($)
Jun. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Investment securities AFS $ 1,270,654   $ 1,378,774      
Interest rate lock commitments            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Interest rate lock commitments, net (75) $ 79 105 $ (360) $ 322 $ 2,484
Recurring            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Single family LHFI 1,225   5,868      
Recurring | Level 3            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Single family LHFI 1,225   5,868      
Recurring | Level 3 | Investment securities AFS            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Investment securities AFS 1,795   2,009      
Recurring | Level 3 | Single family LHFI            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Single family LHFI 1,225   5,868      
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 $ (75)   $ 105      
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 0.0200   0.0200      
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 0.0319   0.0287      
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 0.0200   0.0200      
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 0.0564   0.0515      
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 0.0200   0.0200      
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 0.0399   0.0414      
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 0.0040   0.0010      
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 0.1728   0.1750      
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 0.0836   0.0643      
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 0.0038   0.0054      
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 0.0111   0.0111      
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 0.0074   0.0095