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VARIABLE INTEREST ENTITIES - Additional Information (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
USD ($)
trust
Jun. 30, 2022
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2023
USD ($)
trust
Jun. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Variable Interest Entity [Line Items]            
Total assets $ 9,370,265     $ 9,370,265   $ 9,197,016
Other CRA investments $ 89,000     $ 89,000   85,000
Number of grantor trusts | trust 2     2    
Small Business Investment Companies (SBICs)            
Variable Interest Entity [Line Items]            
Ownership percentage of limited partnership (percent) 3.00%     3.00%    
Variable Interest Entity, Not Primary Beneficiary            
Variable Interest Entity [Line Items]            
Total assets $ 246,140     $ 246,140   251,589
Fundings 0 $ 0   0 $ 0  
Maximum loss exposure 19,111     19,111   21,410
Unpaid principal amount 91,000     91,000    
Investments in grantor trusts 500     500   500
Variable Interest Entity, Not Primary Beneficiary | Multifamily            
Variable Interest Entity [Line Items]            
Fundings     $ 573,500      
Maximum loss exposure $ 68,800     $ 68,800    
Credit losses guaranteed (percent) 12.00%     12.00%    
Repurchase liability recognized $ 1,200     $ 1,200    
Variable Interest Entity, Not Primary Beneficiary | Other Assets            
Variable Interest Entity [Line Items]            
Total assets $ 19,100     $ 19,100   $ 21,400