Summary of Significant Accounting Policies - Stock-Based Compensation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 4,713	$ 5,846	$ 11,353
Income tax benefits	990	1,228	2,384
Excess tax benefits (expenses) on settled share-based employee payments	$ 909	$ (165)	$ 612
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted during the year	62,594	45,540	50,061
Shares vested during the year	34,854	56,203	48,228
Unvested shares at end of year	96,127	71,706	93,351
Unrecognized compensation expense at end of year (in thousands)	$ 2,215	$ 2,003	$ 2,054
Total Shareholder Return Market-Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted during the year	64,910	47,848	99,214
Shares vested during the year	77,174	71,299	106,858
Shares earned based on market metrics	58,652
Unvested shares at end of year	107,854	122,133	178,035
Unrecognized compensation expense at end of year (in thousands)	$ 2,653	$ 2,296	$ 3,377
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted during the year	64,910	47,848	49,609
Shares vested during the year	38,590	35,622	53,454
Shares earned based on market metrics	26,627	63,763	106,908
Unvested shares at end of year	107,854	83,464	88,990
Unrecognized compensation expense at end of year (in thousands)	$ 1,223	$ 1,090	$ 2,401