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INVESTMENT SECURITIES - Additional information (Details) - USD ($)
3 Months Ended 9 Months Ended
Dec. 31, 2019
Dec. 31, 2019
Mar. 31, 2019
INVESTMENT SECURITIES      
Proceeds from the sale of investment securities $ 17,800,000 $ 17,800,000  
Net realized gains on sales of investment securities 30,000 30,000  
Pledged as collateral at amortized cost 6,900,000 6,900,000 $ 5,800,000
Pledged as collateral at fair value $ 6,900,000 $ 6,900,000 $ 5,700,000