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INVESTMENT SECURITIES - Held to maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Mar. 31, 2023
INVESTMENT SECURITIES
Amortized Cost	$ 232,659	$ 243,843
Gross Unrealized Losses	(32,184)	(33,629)
Estimated Fair Value	200,475	210,214
Municipal securities
INVESTMENT SECURITIES
Amortized Cost	10,326	10,344
Gross Unrealized Losses	(2,796)	(2,859)
Estimated Fair Value	7,530	7,485
Agency securities
INVESTMENT SECURITIES
Amortized Cost	54,077	53,941
Gross Unrealized Losses	(4,293)	(5,091)
Estimated Fair Value	49,784	48,850
Real estate mortgage investment conduits
INVESTMENT SECURITIES
Amortized Cost	32,538	35,186
Gross Unrealized Losses	(5,031)	(4,769)
Estimated Fair Value	27,507	30,417
Residential mortgage-backed securities
INVESTMENT SECURITIES
Amortized Cost	115,213	123,773
Gross Unrealized Losses	(16,831)	(17,542)
Estimated Fair Value	98,382	106,231
Other mortgage-backed securities
INVESTMENT SECURITIES
Amortized Cost	20,505	20,599
Gross Unrealized Losses	(3,233)	(3,368)
Estimated Fair Value	$ 17,272	$ 17,231

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