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INCOME TAXES - Effective Income Tax Rate Reconciliation (Details)	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
INCOME TAXES
Statutory federal income tax rate	21.00%	21.00%	30.80%	34.00%
State and local income tax rate	3.00%	3.00%	2.50%
Revaluation of net deferred tax assets due to Tax Act	0.00%	0.00%	11.40%
ESOP market value adjustment	(0.10%)	(0.10%)	(0.00%)
BOLI	(1.00%)	(0.80%)	(1.50%)
Other, net	0.60%	(0.10%)	(0.10%)
Effective federal income tax rate	23.50%	23.00%	43.10%

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- Definition

Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to revaluation of net deferred tax assets.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to life insurance expense.

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Percentage of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to nondeductible expense for share-based payment arrangement.

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