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EMPLOYEE BENEFIT PLANS - Additional Information (Details) - USD ($)	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options exercised (in shares)	20,000	58,000	37,533
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock options granted	0	0	0
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense	$ 348,000	$ 323,000
Stock based Compensation Expense	$ 352,000	$ 302,000	$ 0
Number of stock awards granted	90,763	82,673
Shares cancelled	0
Restricted stock | Weighted average
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year 7 months 17 days	1 year 8 months 5 days
Performance Based
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock awards granted	71,310	33,375
Shares cancelled	7,913
Time Based
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock awards granted	19,453	49,298
Shares cancelled	0
Retirement Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expenses related to plan	$ 525,000	$ 561,000	$ 527,000
Directors' and Executive Officers' Deferred Compensation Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred compensation plan annual interest rate	3.61%	4.46%	4.28%
Aggregate liability under the plan	$ 312,000	$ 263,000
Stock Option Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum term	10 years
Vesting period	Zero to five years
Number of shares reserved for common stock	1,800,000
Unrecognized compensation expense	$ 0
Stock based Compensation Expense	0	0	$ 0
Total intrinsic value of stock options exercised	$ 68,000	$ 238,000	$ 153,000
Stock Option Plans | President and Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock options granted	500	1,000
Stock based Compensation Expense	$ 44,000	$ 44,000
Stock Option Plans | Trust Company | President and Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock options granted	0	0	0
Stock options exercised (in shares)	500	1,500

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