STOCK OWNERSHIP AND BENEFIT PLANS - Activity of Nonvested Shares of Restricted Stock and Restricted Stock Units (Details) - 2016 Plan - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Unvested RSAs
Shares
Balance at the beginning of the period (in shares)	249,565	291,480
Granted (in shares)	120,872	100,882
Vested (in shares)	(140,537)	(135,709)
Forfeited (in shares)	(250)	(7,088)
Balance at the end of the period (in shares)	229,650	249,565
Weighted Average Grant Date Fair Value
Balance at the beginning of the period (in dollars per share)	$ 27.81	$ 25.12
Granted (in dollars per share)	50.48	34.07
Vested (in dollars per share)	26.96	26.20
Forfeited (in dollars per share)	45.47	37.08
Balance at the end of the period (in dollars per share)	$ 40.26	$ 27.81
Unvested RSUs
Shares
Balance at the beginning of the period (in shares)	71,440	87,059
Granted (in shares)	12,989	27,730
Vested (in shares)	(32,131)	(39,009)
Forfeited (in shares)	0	(4,340)
Balance at the end of the period (in shares)	52,298	71,440
Weighted Average Grant Date Fair Value
Balance at the beginning of the period (in dollars per share)	$ 31.65	$ 26.05
Granted (in dollars per share)	67.78	35.29
Vested (in dollars per share)	29.95	23.53
Forfeited (in dollars per share)	0	15.65
Balance at the end of the period (in dollars per share)	$ 41.67	$ 31.65