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MORTGAGE BANKING OPERATIONS - Sensitivity Analysis (Details) - Single family
$ in Thousands
 3 Months Ended
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Key economic assumptions and the sensitivity of the current fair value for single family MSRs        
Fair value of single family MSR $ 74,056 $ 74,249 $ 75,701 $ 76,617
Expected weighted-average life (in years) 8 years 5 months 26 days      
Constant Prepayment Rate [Abstract]        
Impact on fair value of 25 basis points adverse change in interest rates $ (621)      
Impact on fair value of 50 basis points adverse change in interest rates (1,344)      
Discount Rate [Abstract]        
Impact on fair value of 100 basis points increase (1,952)      
Impact on fair value of 200 basis points increase $ (4,627)      
Low | CPRs (2)        
Key economic assumptions and the sensitivity of the current fair value for single family MSRs        
Measurement input (as a percent) 0.0620 0.0680    
Low | Discount rate        
Key economic assumptions and the sensitivity of the current fair value for single family MSRs        
Measurement input (as a percent) 0.1000 0.1000    
High | CPRs (2)        
Key economic assumptions and the sensitivity of the current fair value for single family MSRs        
Measurement input (as a percent) 0.3300 0.3250    
High | Discount rate        
Key economic assumptions and the sensitivity of the current fair value for single family MSRs        
Measurement input (as a percent) 0.1600 0.1700    
Weighted Average | CPRs (2)        
Key economic assumptions and the sensitivity of the current fair value for single family MSRs        
Measurement input (as a percent) 0.0660 0.0700    
Weighted Average | Discount rate        
Key economic assumptions and the sensitivity of the current fair value for single family MSRs        
Measurement input (as a percent) 0.1064 0.1000