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SECURITIES - Schedule of Available for Sale Securities Pledged (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Jun. 30, 2023
Schedule of Available for Sale Securities [Line Items]    
Investment securities available for sale $ 1,215,633 $ 1,227,729
Asset Pledged as Collateral    
Schedule of Available for Sale Securities [Line Items]    
Investment securities available for sale 748,075 730,455
Asset Pledged as Collateral | Pledged to secure public funds on deposit    
Schedule of Available for Sale Securities [Line Items]    
Investment securities available for sale 189,608 201,239
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 $ 558,467 $ 529,216