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SECURITIES - Schedule of Available for Sale Securities Pledged (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Jun. 30, 2023
Schedule of Available for Sale Securities [Line Items]    
Investment securities available for sale $ 1,098,655 $ 1,227,729
Asset Pledged as Collateral    
Schedule of Available for Sale Securities [Line Items]    
Investment securities available for sale 752,505 730,455
Asset Pledged as Collateral | Pledged to secure public funds on deposit    
Schedule of Available for Sale Securities [Line Items]    
Investment securities available for sale 154,608 201,239
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 507,101 529,216
Asset Pledged as Collateral | Pledged for the bank term funding program    
Schedule of Available for Sale Securities [Line Items]    
Investment securities available for sale $ 90,796 $ 0