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INVESTMENT SECURITIES - Sales of Securities, Unrealized Gains (Losses) (Details) - USD ($)
3 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Jun. 30, 2023
INVESTMENT SECURITIES      
Proceeds from the sale of securities available for sale $ 0 $ 0  
Proceeds from the sales of securities held to maturity 0 0  
Proceeds from sales of equity securities 0 $ 0  
Carrying value of available for sale securities pledged to secure FHLBNY advances and municipal deposits $ 407,200,000   $ 428,500,000