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GUARANTEES AND MORTGAGE REPURCHASE LIABILITY (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Dec. 31, 2021
Loss Contingencies [Line Items]                
Loans serviced for others $ 7,249,934,000   $ 7,249,934,000     $ 7,375,383,000    
Single family                
Loss Contingencies [Line Items]                
Loans serviced for others 5,349,832,000   5,349,832,000     5,436,899,000    
Representations and warranties reserve for loan receivables                
Loss Contingencies [Line Items]                
Reserve liability related to mortgage repurchase 1,645,000 $ 1,959,000 1,645,000 $ 1,959,000 $ 1,728,000 2,232,000 $ 1,491,000 $ 1,312,000
Loss sharing relationship                
Loss Contingencies [Line Items]                
Reserve liability related to multifamily DUS program 500,000   500,000     600,000    
Loss sharing relationship | Multifamily                
Loss Contingencies [Line Items]                
UPB of loans sold through DUS 1,800,000,000   1,800,000,000     1,800,000,000    
Losses incurred - related to DUS 0 $ 0 0 $ 0        
Credit risk                
Loss Contingencies [Line Items]                
Reserve liability related to mortgage repurchase $ 1,600,000   $ 1,600,000     $ 2,200,000