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VARIABLE INTEREST ENTITIES - Additional Information (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
Dec. 31, 2022
USD ($)
trust
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Variable Interest Entity [Line Items]        
Total assets   $ 9,197,016 $ 9,393,743  
Other CRA investments   $ 85,000 77,600  
Number of grantor trusts | trust   2    
Small Business Investment Companies (SBICs)        
Variable Interest Entity [Line Items]        
Ownership percentage of limited partnership (percent)   3.00%    
Variable Interest Entity, Not Primary Beneficiary        
Variable Interest Entity [Line Items]        
Total assets   $ 251,589 259,746  
Maximum loss exposure   21,410 25,888  
Fundings   0 0 $ 3,631
Investments in grantor trusts   527 527  
Variable Interest Entity, Not Primary Beneficiary | Other Assets        
Variable Interest Entity [Line Items]        
Total assets   21,400 $ 25,900  
Variable Interest Entity, Not Primary Beneficiary | Multifamily        
Variable Interest Entity [Line Items]        
Maximum loss exposure   $ 68,800    
Fundings $ 573,500      
Credit losses guaranteed (percent)   12.00%    
Unpaid principal amount   $ 114,900    
Repurchase liability recognized   $ 2,000