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MORTGAGE BANKING OPERATIONS - Sensitivity Analysis (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 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 $ 77,811  
Expected weighted-average life (in years) 7 years 9 months 25 days  
Constant Prepayment Rate [Abstract]    
Impact on fair value of 25 basis points adverse change in interest rates $ (469)  
Impact on fair value of 50 basis points adverse change in interest rates (1,092)  
Discount Rate [Abstract]    
Impact on fair value of 100 basis points increase (4,703)  
Impact on fair value of 200 basis points increase $ (9,044)  
Low | CPRs    
Key economic assumptions and the sensitivity of the current fair value for single family MSRs    
Measurement input (as a percent) 0.0599 0.0790
Low | Discount rate    
Key economic assumptions and the sensitivity of the current fair value for single family MSRs    
Measurement input (as a percent) 0.0972 0.0694
High | CPRs    
Key economic assumptions and the sensitivity of the current fair value for single family MSRs    
Measurement input (as a percent) 0.1148 0.1735
High | Discount rate    
Key economic assumptions and the sensitivity of the current fair value for single family MSRs    
Measurement input (as a percent) 0.1689 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) 0.0831 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) 0.1063 0.0797