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VARIABLE INTEREST ENTITIES - Additional Information (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
trust
Sep. 30, 2022
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2023
USD ($)
trust
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Variable Interest Entity [Line Items]            
Total assets $ 9,247,072     $ 9,247,072   $ 9,197,016
Other CRA investments $ 88,600     $ 88,600   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 $ 244,479     $ 244,479   251,589
Fundings 0 $ 0   0 $ 0  
Maximum loss exposure 18,803     18,803   21,410
Unpaid principal amount 82,100     82,100    
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 $ 18,800     $ 18,800   $ 21,400