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INVESTMENT SECURITIES - Held to maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Mar. 31, 2024
INVESTMENT SECURITIES
Amortized Cost	$ 225,817	$ 229,510
Gross Unrealized Losses	(33,791)	(33,991)
Estimated Fair Value	192,026	195,519
Municipal securities
INVESTMENT SECURITIES
Amortized Cost	10,314	10,321
Gross Unrealized Losses	(2,892)	(2,789)
Estimated Fair Value	7,422	7,532
Agency securities
INVESTMENT SECURITIES
Amortized Cost	54,169	54,123
Gross Unrealized Losses	(4,281)	(4,522)
Estimated Fair Value	49,888	49,601
Real estate mortgage investment conduits
INVESTMENT SECURITIES
Amortized Cost	30,922	31,752
Gross Unrealized Losses	(5,228)	(5,171)
Estimated Fair Value	25,694	26,581
Residential mortgage-backed securities
INVESTMENT SECURITIES
Amortized Cost	109,955	112,834
Gross Unrealized Losses	(18,126)	(18,196)
Estimated Fair Value	91,829	94,638
Other mortgage-backed securities
INVESTMENT SECURITIES
Amortized Cost	20,457	20,480
Gross Unrealized Losses	(3,264)	(3,313)
Estimated Fair Value	$ 17,193	$ 17,167

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