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EQUITY AWARDS - Summary of Restricted Stock Awards and Units Activity (Details) - Restricted Stock Awards And Units [Member] - $ / shares | 6 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020
Number of Shares |  |
Outstanding at beginning of year (in shares) | 35,300 | 31,459
Effect of 10% stock dividend (in shares) | 3,530 |
Granted (in shares) | 0 | 0
Vested (in shares) | (4,840) | (10,100)
Forfeited (in shares) | 0 | 0
Balance (in shares) | 33,990 | 21,359
Weighted-Average Grant Date Fair Value |  |
Outstanding at beginning of year | $ 29.72 | $ 30.29
Granted | 0 | 0
Vested | 30.25 | 30.25
Forfeited | 0 | 0
Balance | $ 26.95 | $ 30.31

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