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INVESTMENT SECURITIES - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Investment Securities Pledged as Collateral        
Investment securities pledged to collateralize certain deposits and borrowings   $ 2,270,000 $ 2,140,000  
Proceeds from sales of securities   $ 57,538 $ 733,789 $ 0
Debt Securities, Pledged Status [Extensible Enumeration]   us-gaap:AssetPledgedAsCollateralWithoutRightMember us-gaap:AssetPledgedAsCollateralWithoutRightMember  
Debt Securities, Pledging Purpose [Extensible Enumeration]   Deposits. Deposits.  
Percentage of first half of subscription on FRB stock   0.50%    
Percentage of remaining half of subscription on FRB stock   0.50%    
U.S. Treasury and agency securities        
Investment Securities Pledged as Collateral        
Book value of available-for-sale $ 786,100      
Proceeds from sales of securities $ 733,800      
U.S. Treasury and agency securities | Securities Sold under Agreements to Repurchase        
Investment Securities Pledged as Collateral        
Investment securities pledged to collateralize certain deposits and borrowings   $ 362,100 $ 598,900