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INVESTMENT SECURITIES - Additional information (Details) - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2022	Sep. 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	211,491		$ 236,029
Investment securities held to maturity
INVESTMENT SECURITIES
Held to maturity at amortized cost	12,900		13,700
Debt Securities, Held-to-maturity, Fair Value	10,600		12,600
Asset Pledged as Collateral. | Investment securities available for sale
INVESTMENT SECURITIES
Available for sale with amortized cost	3,500		1,300
Available for sale, estimated fair value	$ 3,200		$ 1,200

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- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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