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INVESTMENT SECURITIES - Additional information (Details) - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Mar. 31, 2025
INVESTMENT SECURITIES
Proceeds from the sale of investment securities	$ 0	$ 0
Gross realized gains or losses on sales of investment securities	0	$ 0
Available for sale with amortized cost	132,621		$ 136,940
Available for sale, at estimated fair value	118,447		119,436
Held to maturity, estimated fair value	169,312		175,392
Asset Pledged as Collateral | Government public funds held by the bank
INVESTMENT SECURITIES
Available for sale with amortized cost	1,800		2,100
Available for sale, at estimated fair value	1,700		2,000
Held to maturity at amortized cost	11,600		12,200
Held to maturity, estimated fair value	10,000		10,400
Asset Pledged as Collateral | FHLB and FRB Borrowing Arrangements
INVESTMENT SECURITIES
Held to maturity at amortized cost	136,100		141,300
Held to maturity, estimated fair value	$ 118,500		$ 120,500

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

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