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INVESTMENT SECURITIES - Additional information (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Mar. 31, 2022
INVESTMENT SECURITIES      
Proceeds from the sale of investment securities $ 0 $ 0  
Gross realized gains on sales of investment securities 0 $ 0  
Debt Securities, Held-to-maturity, Fair Value 229,589   $ 236,029
Investment securities held to maturity      
INVESTMENT SECURITIES      
Held to maturity at amortized cost 13,300   13,700
Debt Securities, Held-to-maturity, Fair Value 11,600   12,600
Asset Pledged as Collateral. | Investment securities available for sale      
INVESTMENT SECURITIES      
Available for sale with amortized cost 3,700   1,300
Available for sale, estimated fair value $ 3,500   $ 1,200