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MORTGAGE BANKING OPERATIONS - Sensitivity Analysis (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
USD ($)
Dec. 31, 2021
Key economic assumptions and the sensitivity of the current fair value for single family MSRs    
Fair value of single family MSR $ 72,378  
Expected weighted-average life (in years) 7 years 1 month 20 days  
Constant Prepayment Rate [Abstract]    
Impact on fair value of 25 basis points adverse change in interest rates $ (2,208)  
Impact on fair value of 50 basis points adverse change in interest rates (4,909)  
Discount Rate [Abstract]    
Impact on fair value of 100 basis points increase (3,217)  
Impact on fair value of 200 basis points increase $ (6,187)  
Minimum | CPRs    
Key economic assumptions and the sensitivity of the current fair value for single family MSRs    
Measurement input (as a percent) 0.0738 0.0790
Minimum | Discount rate    
Key economic assumptions and the sensitivity of the current fair value for single family MSRs    
Measurement input (as a percent) 0.0810 0.0694
Maximum | CPRs    
Key economic assumptions and the sensitivity of the current fair value for single family MSRs    
Measurement input (as a percent) 0.1666 0.1735
Maximum | Discount rate    
Key economic assumptions and the sensitivity of the current fair value for single family MSRs    
Measurement input (as a percent) 0.1518 0.1396
Weighted average | CPRs    
Key economic assumptions and the sensitivity of the current fair value for single family MSRs    
Measurement input (as a percent) 0.0942 0.1035
Weighted average | Discount rate    
Key economic assumptions and the sensitivity of the current fair value for single family MSRs    
Measurement input (as a percent) 0.0905 0.0797