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EMPLOYEE BENEFIT PLANS - Additional Information (Details) - USD ($) | 12 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock options exercised (in shares) | 6,000 | 20,000 | 58,000
Stock options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of stock options granted | 0 | 0 | 0
Stock options | Trust Company | President and Chief Executive Officer |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock based Compensation Expense |  | $ 44,000 |
Restricted stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation expense | $ 401,000 | 348,000 |
Stock based Compensation Expense | $ 319,000 | $ 352,000 | $ 302,000
Number of stock awards granted | 69,285 | 90,763 |
Shares cancelled | 20,976 |  |
Restricted stock | Weighted average |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 1 year 6 months 10 days | 1 year 7 months 17 days |
Performance Based |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of stock awards granted | 54,011 | 71,310 |
Shares cancelled | 16,559 |  |
Time Based |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of stock awards granted | 15,274 | 19,453 |
Shares cancelled | 4,417 |  |
Retirement Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expenses related to plan | $ 529,000 | $ 525,000 | $ 561,000
Directors' and Executive Officers' Deferred Compensation Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Deferred compensation plan annual interest rate | 2.97% | 3.61% | 4.46%
Aggregate liability under the plan | $ 237,000 | $ 312,000 |
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 | $ 25,000 | $ 68,000 | $ 238,000
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 |  |
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 | 500 |

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