Share-Based Compensation - Components of Awards (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax compensation expense	$ 4,115	$ 3,592	$ 2,827
Income tax expense (benefit)	(1,276)	(1,276)	(1,883)
Total share-based compensation expense, net of income taxes	2,839	2,316	944
Stock and ESPP Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax compensation expense	101	109	121
Income tax expense (benefit)	(70)	(97)	(322)
Total share-based compensation expense, net of income taxes	31	12	(201)
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax compensation expense	4,014	3,483	2,706
Income tax expense (benefit)	(1,206)	(1,179)	(1,561)
Total share-based compensation expense, net of income taxes	$ 2,808	$ 2,304	$ 1,145