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FAIR VALUE MEASUREMENT - Schedule of Level 3 Unobservable Inputs (Details)
$ in Thousands
Sep. 30, 2022
USD ($)
Jun. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Sep. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Interest rate lock commitments            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Interest rate lock commitments, net $ (360) $ 322 $ 2,484 $ 4,609 $ 5,893 $ 17,392
Recurring            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Single family LHFI 5,850   7,287      
Recurring | Level 3            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Investment securities AFS 2,033   2,482      
Single family LHFI 5,850   7,287      
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 $ (360)   $ 2,484      
Implied spread to benchmark interest rate curve | Low | Recurring | Level 3            
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 0.0392   0.0239      
Implied spread to benchmark interest rate curve | High | Recurring | Level 3            
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 0.0571   0.0796      
Implied spread to benchmark interest rate curve | Weighted Average | Recurring | Level 3            
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 0.0441   0.0356      
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 0.0010   0.0015      
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 0.1746   0.2193      
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 0.0516   0.0844      
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 0.0059   0.0035      
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 0.0114   0.0146      
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 0.0098   0.0115