Stock Option Plan - Summary of Stock Option Plan (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Beginning Balance, Shares	1,215,097
Granted, Shares	76,500	0	0
Exercised, Shares	(200,629)
Ending Balance, Shares	1,090,968	1,215,097
Options exercisable, Shares	1,014,468
Beginning Balance, Weighted Average Exercise Price	$ 12.83
Granted, Weighted Average Exercise Price	18.38
Exercised, Weighted Average Exercise Price	13.43
Ending Balance, Weighted Average Exercise Price	13.11	$ 12.83
Options exercisable, Weighted Average Exercise Price	$ 12.72
Ending Balance, Weighted Average Remaining Contractual Term	4 years 25 days
Options exercisable, Weighted Average Remaining Contractual Term	3 years 8 months 8 days
Ending Balance, Aggregate Intrinsic Value	$ 8,790
Options exercisable, Aggregate Intrinsic Value	$ 8,577