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INVESTMENT SECURITIES - Additional information (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2021	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
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
Proceeds from sales of investment securities available for sale		$ 43,486,000
Gross realized gains on sales of investment securities		2,700,000	0	$ 0
Available for sale with amortized cost		164,416,000	235,591,000
Available for sale, estimated fair value		143,196,000	211,499,000
Held to maturity, estimated fair value		195,519,000	210,214,000
Asset Pledged as Collateral.
INVESTMENT SECURITIES
Available for sale with amortized cost		2,600,000	3,200,000
Available for sale, estimated fair value		2,400,000	2,900,000
Asset Pledged as Collateral. | Government public funds held by the bank
INVESTMENT SECURITIES
Held to maturity at amortized cost		11,200,000	12,300,000
Held to maturity, estimated fair value		9,300,000	$ 10,400,000
Asset Pledged as Collateral. | FHLB and FRB Borrowing Arrangements
INVESTMENT SECURITIES
Held to maturity at amortized cost		151,200,000
Held to maturity, estimated fair value		$ 126,100,000

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- Definition

Amount, after allowance for credit loss, of debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) transferred to investment in debt security measured at amortized cost (held-to-maturity).

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