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INVESTMENT SECURITIES - Held to maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Mar. 31, 2021
INVESTMENT SECURITIES
Amortized Cost	$ 212,722	$ 39,574
Gross Unrealized Gains	339
Gross Unrealized Losses	(3,034)	(1,354)
Estimated Fair Value	210,027	38,220
Municipal securities
INVESTMENT SECURITIES
Amortized Cost	10,373	10,391
Gross Unrealized Gains	7
Gross Unrealized Losses	(407)	(509)
Estimated Fair Value	9,973	9,882
Agency securities
INVESTMENT SECURITIES
Amortized Cost	34,671	7,688
Gross Unrealized Gains	3
Gross Unrealized Losses	(416)	(220)
Estimated Fair Value	34,258	7,468
Real estate mortgage investment conduits
INVESTMENT SECURITIES
Amortized Cost	28,614	9,207
Gross Unrealized Gains	61
Gross Unrealized Losses	(630)	(141)
Estimated Fair Value	28,045	9,066
Residential mortgage-backed securities
INVESTMENT SECURITIES
Amortized Cost	121,649	6,175
Gross Unrealized Gains	267
Gross Unrealized Losses	(1,147)	(119)
Estimated Fair Value	120,769	6,056
Other mortgage-backed securities
INVESTMENT SECURITIES
Amortized Cost	17,415	6,113
Gross Unrealized Gains	1
Gross Unrealized Losses	(434)	(365)
Estimated Fair Value	$ 16,982	$ 5,748

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Amount excluding accrued interest, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

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