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INVESTMENT SECURITIES - Held to maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Mar. 31, 2025
INVESTMENT SECURITIES
Amortized Cost	$ 192,759	$ 203,079
Gross Unrealized Losses	(23,447)	(27,687)
Estimated Fair Value	169,312	175,392
Municipal securities
INVESTMENT SECURITIES
Amortized Cost	10,283	10,296
Gross Unrealized Losses	(2,492)	(2,667)
Estimated Fair Value	7,791	7,629
Agency securities
INVESTMENT SECURITIES
Amortized Cost	42,329	42,279
Gross Unrealized Losses	(1,948)	(2,723)
Estimated Fair Value	40,381	39,556
Real estate mortgage investment conduits
INVESTMENT SECURITIES
Amortized Cost	26,828	28,499
Gross Unrealized Losses	(3,552)	(4,231)
Estimated Fair Value	23,276	24,268
Residential mortgage-backed securities
INVESTMENT SECURITIES
Amortized Cost	96,322	101,933
Gross Unrealized Losses	(13,252)	(15,448)
Estimated Fair Value	83,070	86,485
Other mortgage-backed securities
INVESTMENT SECURITIES
Amortized Cost	16,997	20,072
Gross Unrealized Losses	(2,203)	(2,618)
Estimated Fair Value	$ 14,794	$ 17,454

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