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FAIR VALUE MEASUREMENT - Schedule of Level 3 Unobservable Inputs (Details)
$ in Thousands
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investment securities AFS $ 1,161,008 $ 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 336 411 $ 362 $ 105
Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Single family LHFI 1,285 1,280    
Recurring | Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Single family LHFI 1,285 1,280    
Recurring | Level 3 | Investment securities AFS        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investment securities AFS 1,791 1,860    
Recurring | Level 3 | Single family LHFI        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Single family LHFI 1,285 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 $ 336 $ 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 0.0397 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 0.0536 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 0.0444 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 0.0007 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 0.3020 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 0.0848 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 0.0015 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 0.0093 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 0.0062 0.0057