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INVESTMENT SECURITIES - Additional information (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
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 $ 17,800,000
Gross realized gains on sales of investment securities   0 0 $ 30,000
Investment securities available for sale        
INVESTMENT SECURITIES        
Pledged as collateral at amortized cost   1,300,000 5,300,000  
Pledged as collateral at fair value   1,200,000 5,400,000  
Investment securities held to maturity        
INVESTMENT SECURITIES        
Pledged as collateral at amortized cost   13,700,000 3,100,000  
Pledged as collateral at fair value   $ 12,600,000 $ 3,000,000.0