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INVESTMENT SECURITIES - Held to maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Mar. 31, 2022
INVESTMENT SECURITIES
Amortized Cost	$ 247,147	$ 253,100
Gross Unrealized Losses	(37,414)	(17,071)
Estimated Fair Value	209,733	236,029
Municipal securities
INVESTMENT SECURITIES
Amortized Cost	10,350	10,368
Gross Unrealized Losses	(3,244)	(1,422)
Estimated Fair Value	7,106	8,946
Agency securities
INVESTMENT SECURITIES
Amortized Cost	53,896	45,277
Gross Unrealized Losses	(5,887)	(2,450)
Estimated Fair Value	48,009	42,827
Real estate mortgage investment conduits
INVESTMENT SECURITIES
Amortized Cost	36,008	39,394
Gross Unrealized Losses	(5,346)	(2,457)
Estimated Fair Value	30,662	36,937
Residential mortgage-backed securities
INVESTMENT SECURITIES
Amortized Cost	126,271	137,343
Gross Unrealized Losses	(19,254)	(8,883)
Estimated Fair Value	107,017	128,460
Other mortgage-backed securities
INVESTMENT SECURITIES
Amortized Cost	20,622	20,718
Gross Unrealized Losses	(3,683)	(1,859)
Estimated Fair Value	$ 16,939	$ 18,859

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- Definition

Amount excluding accrued interest, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity).

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