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VARIABLE INTEREST ENTITIES - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Sep. 30, 2019
Dec. 31, 2020
Variable Interest Entity [Line Items]        
Total assets $ 7,933,459     $ 7,877,334
Variable Interest Entity, Not Primary Beneficiary        
Variable Interest Entity [Line Items]        
Funding transferred 0 $ 3,631    
Total assets 251,220     251,713
Maximum loss exposure 23,809     27,977
Variable Interest Entity, Not Primary Beneficiary | Other Assets        
Variable Interest Entity [Line Items]        
Total assets $ 23,800     $ 28,000
Variable Interest Entity, Not Primary Beneficiary | Multifamily        
Variable Interest Entity [Line Items]        
Funding transferred     $ 573,500  
Credit losses guaranteed (percent) 12.00%      
Repurchase liability recognized $ 3,600      
Maximum loss exposure $ 68,800