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VARIABLE INTEREST ENTITIES - Additional Information (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
Dec. 31, 2021
USD ($)
trust
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Variable Interest Entity [Line Items]        
Number of grantor trusts | trust   2    
Total assets   $ 9,393,743 $ 7,877,334  
Variable Interest Entity, Not Primary Beneficiary        
Variable Interest Entity [Line Items]        
Fundings   0 3,631 $ 806
Maximum loss exposure   25,888 27,977  
Investments in grantor trusts   527    
Total assets   259,746 251,713  
Variable Interest Entity, Not Primary Beneficiary | Other Assets        
Variable Interest Entity [Line Items]        
Total assets   $ 25,900 $ 28,000  
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   $ 2,900