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INVESTMENT SECURITIES - Held to maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Mar. 31, 2024
INVESTMENT SECURITIES
Amortized Cost	$ 212,295	$ 229,510
Gross Unrealized Losses	(31,821)	(33,991)
Estimated Fair Value	180,474	195,519
Municipal securities
INVESTMENT SECURITIES
Amortized Cost	10,302	10,321
Gross Unrealized Losses	(2,945)	(2,789)
Estimated Fair Value	7,357	7,532
Agency securities
INVESTMENT SECURITIES
Amortized Cost	48,253	54,123
Gross Unrealized Losses	(3,368)	(4,522)
Estimated Fair Value	44,885	49,601
Real estate mortgage investment conduits
INVESTMENT SECURITIES
Amortized Cost	29,249	31,752
Gross Unrealized Losses	(4,786)	(5,171)
Estimated Fair Value	24,463	26,581
Residential mortgage-backed securities
INVESTMENT SECURITIES
Amortized Cost	104,314	112,834
Gross Unrealized Losses	(17,686)	(18,196)
Estimated Fair Value	86,628	94,638
Other mortgage-backed securities
INVESTMENT SECURITIES
Amortized Cost	20,177	20,480
Gross Unrealized Losses	(3,036)	(3,313)
Estimated Fair Value	$ 17,141	$ 17,167

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