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MORTGAGE BANKING OPERATIONS - Sensitivity Analysis (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
USD ($)
Dec. 31, 2020
Key economic assumptions and the sensitivity of the current fair value for single family MSRs    
Fair value of single family MSR $ 61,206  
Expected weighted-average life (in years) 5 years 10 months 13 days  
Constant Prepayment Rate [Abstract]    
Impact on fair value of 25 basis points adverse change in interest rates $ (3,490)  
Impact on fair value of 50 basis points adverse change in interest rates (7,016)  
Discount Rate [Abstract]    
Impact on fair value of 100 basis points increase (2,949)  
Impact on fair value of 200 basis points increase $ (5,675)  
Minimum | CPRs    
Key economic assumptions and the sensitivity of the current fair value for single family MSRs    
Measurement input (as a percent) 0.0798 0.0813
Minimum | Discount rate    
Key economic assumptions and the sensitivity of the current fair value for single family MSRs    
Measurement input (as a percent) 0.0654 0.0650
Maximum | CPRs    
Key economic assumptions and the sensitivity of the current fair value for single family MSRs    
Measurement input (as a percent) 0.1743 0.1970
Maximum | Discount rate    
Key economic assumptions and the sensitivity of the current fair value for single family MSRs    
Measurement input (as a percent) 0.1378 0.1314
Weighted average | CPRs    
Key economic assumptions and the sensitivity of the current fair value for single family MSRs    
Measurement input (as a percent) 0.1074 0.1281
Weighted average | Discount rate    
Key economic assumptions and the sensitivity of the current fair value for single family MSRs    
Measurement input (as a percent) 0.0784 0.0827