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GUARANTEES AND MORTGAGE REPURCHASE LIABILITY - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Representations and warranties reserve for loan receivables                
Loss Contingencies [Line Items]                
Unfunded commitment balance of loans sold on a servicing-retained basis $ 5,700,000,000   $ 5,700,000,000     $ 6,000,000,000.0    
Reserve liability related to mortgage repurchase 1,612,000 $ 2,083,000 1,612,000 $ 2,083,000 $ 1,941,000 2,122,000 $ 2,482,000 $ 2,871,000
Loss sharing relationship                
Loss Contingencies [Line Items]                
Reserve liability related to multifamily DUS program 700,000   700,000     2,100,000    
Loss sharing relationship | Multifamily                
Loss Contingencies [Line Items]                
UPB of loans sold through DUS 1,900,000,000   1,900,000,000     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     $ 2,100,000