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GUARANTEES AND MORTGAGE REPURCHASE LIABILITY (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Representations and warranties reserve for loan receivables                
Loss Contingencies [Line Items]                
Unfunded commitment balance of loans sold on a servicing-retained basis $ 5,500,000,000   $ 5,500,000,000     $ 5,500,000,000    
Reserve liability related to mortgage repurchase 1,491,000 $ 1,612,000 1,491,000 $ 1,612,000 $ 1,638,000 1,312,000 $ 1,941,000 $ 2,122,000
Loss sharing relationship                
Loss Contingencies [Line Items]                
Reserve liability related to multifamily DUS program 700,000   700,000     600,000    
Loss sharing relationship | Multifamily                
Loss Contingencies [Line Items]                
UPB of loans sold through DUS 1,800,000,000   1,800,000,000     1,900,000,000    
Losses incurred - related to DUS 0 $ 0 0 $ 0        
Credit risk                
Loss Contingencies [Line Items]                
Reserve liability related to mortgage repurchase $ 1,500,000   $ 1,500,000     $ 1,300,000