Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2021

Share-based Payment Arrangement [Abstract]

Summary of Treasury Stock Activity

Activity in treasury stock is as follows for the years ended December 31,:

	2021			2020
	Shares	Amount		Shares	Amount
Balance, beginning of year	1,557,054	$	38,148	1,498,202	$	36,706
Purchases	—	—		63,844	1,564
Issuances	—	—		4,992	122
Balance, end of year	1,557,054	$	38,148	1,557,054	$	38,148

Schedule of Assumptions

A summary of the assumptions is as follows at December 31,:

	2021		2020		2019
Expected volatility	33.00	%	33.00	%	27.00	%
Expected term (in years)	6.25		6.25		6.25
Expected dividends	—	%	—	%	—	%
Risk-free rate	1.11	%	0.49	%	1.79	%

Summary of Stock Option Activity

The following table presents a summary of stock option activity under the 2017 Plan, and changes during the years ended December 31,:

	Shares	Weighted-Average Exercise Price, per Share		Weighted-Average Remaining Contractual Term (years)
2021
Outstanding, beginning of year	1,428,940	$	19.97
Granted	26,336	32.54
Forfeited	(42,376)	20.33
Outstanding, end of year	1,412,900	$	20.19	6.21
Options vested or expected to vest	1,412,900	$	20.19
Options exercisable, end of year	1,166,887	$	19.89	5.88
2020
Outstanding, beginning of year	1,444,757	$	19.96
Exercised	(54,814)	19.72
Granted	133,707	20.01
Forfeited	(94,710)	20.13
Outstanding, end of year	1,428,940	$	19.97	7.17
Options vested or expected to vest	1,428,940	$	19.97
Options exercisable, end of year	856,133	$	19.88	6.80