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VARIABLE INTEREST ENTITIES - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Variable Interest Entity [Line Items]            
Total assets $ 8,278,741     $ 8,278,741   $ 7,877,334
Variable Interest Entity, Not Primary Beneficiary            
Variable Interest Entity [Line Items]            
Fundings 0 $ 0   0 $ 3,631  
Maximum loss exposure 25,196     25,196   27,977
Total assets 246,796     246,796   251,713
Variable Interest Entity, Not Primary Beneficiary | Other Assets            
Variable Interest Entity [Line Items]            
Total assets $ 25,200     $ 25,200   $ 28,000
Variable Interest Entity, Not Primary Beneficiary | Multifamily            
Variable Interest Entity [Line Items]            
Fundings     $ 573,500      
Credit losses guaranteed (percent) 12.00%     12.00%    
Maximum loss exposure $ 68,800     $ 68,800    
Repurchase liability recognized $ 3,600     $ 3,600