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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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