STOCK OWNERSHIP AND BENEFIT PLANS - Schedule of Activity of Nonvested Performance Stock Units (Details) - Unvested PSUs - 2016 Plan - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Shares
Balance at the beginning of the period (in shares)	56,110	63,640
Granted (in shares)	44,861	45,948
Vested (in shares)	(40,000)	(46,000)
Forfeited (in shares)	0	(7,478)
Balance at the end of the period (in shares)	60,971	56,110
Weighted Average Grant Date Fair Value
Balance at the beginning of the period (in dollars per share)	$ 57.63	$ 32.97
Granted (in dollars per share)	59.65	49.93
Vested (in dollars per share)	26.47	18.18
Forfeited (in dollars per share)	0	43.17
Balance at the end of the period (in dollars per share)	$ 79.56	$ 57.63