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VARIABLE INTEREST ENTITIES - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Variable Interest Entity [Line Items]        
Total assets   $ 7,877,334 $ 7,828,410  
Variable Interest Entity, Not Primary Beneficiary        
Variable Interest Entity [Line Items]        
Fundings   3,631 806 $ 0
Maximum loss exposure   27,977 32,525  
Total assets   251,713 259,445  
Variable Interest Entity, Not Primary Beneficiary | Other Assets        
Variable Interest Entity [Line Items]        
Total assets   $ 28,000 $ 29,300  
Variable Interest Entity, Not Primary Beneficiary | Multifamily        
Variable Interest Entity [Line Items]        
Fundings $ 573,500      
Credit losses guaranteed (percent)   12.00%    
Maximum loss exposure   $ 68,800    
Repurchase liability recognized   $ 3,600