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INVESTMENT SECURITIES - Held to maturity (Details) - USD ($) $ in Thousands		Dec. 31, 2020	Mar. 31, 2020
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost		$ 33,425	$ 28
Gross Unrealized Gains		157
Gross Unrealized Losses		(88)
Estimated Fair Value		33,494
Residential mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	[1]	6,295	28
Gross Unrealized Gains	[1]	10	0
Gross Unrealized Losses	[1]	(41)	0
Estimated Fair Value	[1]	6,264	$ 28
Municipal securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost		6,009
Gross Unrealized Gains		136
Gross Unrealized Losses		(32)
Estimated Fair Value		6,113
Agency securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost		7,700
Gross Unrealized Gains		2
Gross Unrealized Losses		(8)
Estimated Fair Value		7,694
Real estate mortgage investment conduits
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost		9,324
Gross Unrealized Gains		9
Gross Unrealized Losses		(7)
Estimated Fair Value		9,326
Other mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost		4,097
Estimated Fair Value		$ 4,097
[1] Comprised of FHLMC and FNMA issued securities.

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