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BORROWINGS - Additional Information (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Jun. 30, 2025
Federal Reserve Bank Term Funding Program ("BTFP") borrowings    
Debt Instrument [Line Items]    
Borrowing capacity $ 2,540,000  
Investment in Federal Home Loan Bank Stock    
Debt Instrument [Line Items]    
Federal Home Loan Bank, advances, general debt obligations, disclosures, collateral pledged $ 3,220,000 $ 3,240,000