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SECURITIES - Schedule of Available for Sale Securities Pledged (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Jun. 30, 2025
Schedule of Available for Sale Securities [Line Items]    
Investment securities available for sale $ 1,016,182 $ 1,012,969
Asset Pledged as Collateral    
Schedule of Available for Sale Securities [Line Items]    
Investment securities available for sale 313,001 542,045
Asset Pledged as Collateral | Pledged to secure public funds on deposit    
Schedule of Available for Sale Securities [Line Items]    
Investment securities available for sale 248,253 475,234
Asset Pledged as Collateral | Pledged for potential borrowings at the Federal Reserve Bank of New York    
Schedule of Available for Sale Securities [Line Items]    
Investment securities available for sale $ 64,748 $ 66,811