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INVESTMENT SECURITIES - Additional information (Details) - USD ($)
3 Months Ended 9 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Mar. 31, 2021
INVESTMENT SECURITIES          
Available for sale securities transferred to held to maturity $ 85,800,000        
Unrealized after tax gain 18,000        
Gains (losses) recognized at time of transfer 0        
Proceeds from the sale of investment securities 0 $ 0   $ 0  
Gross realized gains on sales of investment securities 0 $ 0 $ 0    
Available-for-sale Securities          
INVESTMENT SECURITIES          
Pledged as collateral at amortized cost 1,500,000   1,500,000   $ 5,300,000
Pledged as collateral at fair value 1,500,000   1,500,000   5,400,000
Held-to-maturity Securities          
INVESTMENT SECURITIES          
Pledged as collateral at amortized cost 11,100,000   11,100,000   3,100,000
Pledged as collateral at fair value $ 10,900,000   $ 10,900,000   $ 3,000,000.0