Stock Based Compensation (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement [Abstract]

Summary of activity regarding active stock option and stock award plans

The following table shows the combined summary of activity regarding active stock option and stock award plans.

		Non-Vested Stock Awards Outstanding
	Shares Available for Grant	Number of Shares	Weighted-Average Grant-Date Fair Value
Balance, January 1, 2018	676,444	295,926	$	27.41
Shares authorized - 2018 EIP	70,461	—	—
Granted	(74,981)	74,981	29.11
Stock awards vested	—	(106,513)	25.79
Forfeited	3,135	(10,575)	27.51
Balance, December 31, 2018	675,059	253,819	28.59
Shares authorized - 2019 EIP	62,538	—	—
Granted	(74,336)	74,336	31.44
Stock awards vested	—	(100,299)	28.35
Forfeited	1,241	(8,865)	30.28
Balance, December 31, 2019	664,502	218,991	29.60
Shares authorized - 2020 EIP	60,233	—	—
Granted	(147,576)	147,576	37.41
Stock awards vested	—	(74,203)	28.95
Forfeited	49	(870)	31.82
Balance, December 31, 2020	577,208	291,494	$	33.71