EQUITY AWARDS - Summary of Restricted Stock Awards and Units Activity (Details) - Restricted Stock Awards And Units [Member] - $ / shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 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)	(6,100)
Forfeited (in shares)	0	0
Balance (in shares)	33,990	25,359
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	$ 30.29