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INVESTMENT SECURITIES - Additional information (Details) - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Mar. 31, 2024
INVESTMENT SECURITIES
Proceeds from the sale of investment securities	$ 0	$ 0
Gross realized gains on sales of investment securities	0	$ 0
Available for sale with amortized cost	149,629		$ 164,416
Available for sale, at estimated fair value	132,953		143,196
Held to maturity, estimated fair value	195,869		195,519
Asset Pledged as Collateral
INVESTMENT SECURITIES
Available for sale with amortized cost	2,400		2,600
Available for sale, at estimated fair value	2,200		2,400
Held to maturity at amortized cost	10,700		11,200
Held to maturity, estimated fair value	9,200		9,300
Asset Pledged as Collateral | FHLB and FRB Borrowing Arrangements
INVESTMENT SECURITIES
Held to maturity at amortized cost	145,900		151,200
Held to maturity, estimated fair value	$ 126,400		$ 126,100

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Amount of unrealized and realized gain (loss) on investment in debt and equity securities.

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