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GUARANTEES AND MORTGAGE REPURCHASE LIABILITY (Details) - USD ($)
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Loss Contingencies [Line Items]        
Loans serviced for others $ 7,176,249,000   $ 7,216,343,000  
Single family        
Loss Contingencies [Line Items]        
Loans serviced for others 5,280,531,000   5,316,304,000  
Representations and warranties reserve for loan receivables        
Loss Contingencies [Line Items]        
Reserve liability related to mortgage repurchase 1,317,000 $ 1,789,000 1,481,000 $ 2,232,000
Loss sharing relationship        
Loss Contingencies [Line Items]        
Reserve liability related to multifamily DUS program 400,000   500,000  
Loss sharing relationship | Multifamily        
Loss Contingencies [Line Items]        
UPB of loans sold through DUS 1,800,000,000   1,800,000,000  
Losses incurred - related to DUS 0 $ 0    
Credit risk        
Loss Contingencies [Line Items]        
Reserve liability related to mortgage repurchase $ 1,300,000   $ 1,500,000