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INVESTMENT SECURITIES - Held to maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Mar. 31, 2024
INVESTMENT SECURITIES
Amortized Cost	$ 221,991	$ 229,510
Gross Unrealized Losses	(26,122)	(33,991)
Estimated Fair Value	195,869	195,519
Municipal securities
INVESTMENT SECURITIES
Amortized Cost	10,308	10,321
Gross Unrealized Losses	(2,463)	(2,789)
Estimated Fair Value	7,845	7,532
Agency securities
INVESTMENT SECURITIES
Amortized Cost	54,216	54,123
Gross Unrealized Losses	(2,932)	(4,522)
Estimated Fair Value	51,284	49,601
Real estate mortgage investment conduits
INVESTMENT SECURITIES
Amortized Cost	30,008	31,752
Gross Unrealized Losses	(4,150)	(5,171)
Estimated Fair Value	25,858	26,581
Residential mortgage-backed securities
INVESTMENT SECURITIES
Amortized Cost	107,039	112,834
Gross Unrealized Losses	(14,006)	(18,196)
Estimated Fair Value	93,033	94,638
Other mortgage-backed securities
INVESTMENT SECURITIES
Amortized Cost	20,420	20,480
Gross Unrealized Losses	(2,571)	(3,313)
Estimated Fair Value	$ 17,849	$ 17,167

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