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INVESTMENT SECURITIES - Sales of Securities, Realized Gain/Losses (Details) - USD ($)
3 Months Ended 6 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Jun. 30, 2020
INVESTMENT SECURITIES          
Proceeds from the sale of securities available for sale $ 0 $ 0 $ 0 $ 0  
Proceeds from the sales of securities held to maturity 0 $ 0 0 $ 0  
Proceeds from sale of equity securities 7,500,000   7,474,000    
Carrying value of available for sale securities pledged to secure FHLBNY advances and municipal deposits $ 127,500,000   $ 127,500,000   $ 65,000,000