INVESTMENT SECURITIES - Held to maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023
INVESTMENT SECURITIES
Amortized Cost	$ 229,510	$ 243,843
Gross Unrealized Losses	(33,991)	(33,629)
Estimated Fair Value	195,519	210,214
Municipal securities
INVESTMENT SECURITIES
Amortized Cost	10,321	10,344
Gross Unrealized Losses	(2,789)	(2,859)
Estimated Fair Value	7,532	7,485
Agency securities
INVESTMENT SECURITIES
Amortized Cost	54,123	53,941
Gross Unrealized Losses	(4,522)	(5,091)
Estimated Fair Value	49,601	48,850
Real estate mortgage investment conduits
INVESTMENT SECURITIES
Amortized Cost	31,752	35,186
Gross Unrealized Losses	(5,171)	(4,769)
Estimated Fair Value	26,581	30,417
Residential mortgage-backed securities
INVESTMENT SECURITIES
Amortized Cost	112,834	123,773
Gross Unrealized Losses	(18,196)	(17,542)
Estimated Fair Value	94,638	106,231
Other mortgage-backed securities
INVESTMENT SECURITIES
Amortized Cost	20,480	20,599
Gross Unrealized Losses	(3,313)	(3,368)
Estimated Fair Value	$ 17,167	$ 17,231