INVESTMENT SECURITIES - Additional information (Details) - USD ($) $ in Thousands	9 Months Ended
Dec. 31, 2022	Dec. 31, 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	209,733		$ 236,029
Investment securities held to maturity
INVESTMENT SECURITIES
Held to maturity at amortized cost	12,600		13,700
Debt Securities, Held-to-maturity, Fair Value	10,500		12,600
Asset Pledged as Collateral. \| Investment securities available for sale
INVESTMENT SECURITIES
Available for sale with amortized cost	3,400		1,300
Available for sale, estimated fair value	$ 3,100		$ 1,200

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount of unrealized and realized gain (loss) on investment in debt and equity securities.

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Amount, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity), classified as current.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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The cash inflow associated with the sale of securities classified as trading securities and held for investment purposes. Excludes proceeds from trading securities purchased and held principally for the purpose of selling them in the near term (thus held for only a short period of time).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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