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INVESTMENT SECURITIES - Additional information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Mar. 31, 2020
INVESTMENT SECURITIES          
Proceeds from the sale of investment securities $ 0.0   $ 0.0    
Gross realized gains on sales of investment securities   $ 0.0   $ 0.0  
Pledged as collateral at amortized cost 6.0   6.0   $ 6.6
Pledged as collateral at fair value $ 6.2   $ 6.2   $ 6.8