Stock and Other Incentive Plans - Employee Stock Purchase Plan (Details) - Employee Stock Purchase Plan - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Stock Options Outstanding:
Options outstanding, beginning of year (in shares)	341,647	332,659	328,533
Granted (in shares)	253,200	212,716	235,572
Exercised (in shares)	(30,281)	(21,713)	(35,277)
Forfeited (in shares)	(71,630)	(42,221)	(54,095)
Expired (in shares)	(144,422)	(139,794)	(142,074)
Outstanding, end of period (in shares)	348,514	341,647	332,659
Weighted-average exercise price:
Options outstanding, beginning of year (in dollars per share)	$ 24.70	$ 25.59	$ 24.17
Options granted during the year (in dollars per share)	25.16	28.36	24.17
Options exercised during the year (in dollars per share)	25.03	24.10	25.01
Options forfeited during the year (in dollars per share)	25.45	25.29	25.26
Options expired during the year (in dollars per share)	24.17	23.74	25.77
Options outstanding, end of year (in dollars per share)	25.38	24.70	25.59
Weighted-average fair value of options granted during the year (calculated as of the grant date) (in dollars per share)	$ 9.05	$ 8.06	$ 7.02
Intrinsic value of options exercised during the year	$ 165	$ 101	$ 269
Intrinsic value of options outstanding (calculated as of December 31)	$ 1,997	$ 1,673	$ 2,589
Exercise prices of options outstanding (calculated as of December 31) (in dollars per share)	$ 25.91	$ 24.70	$ 25.59
Weighted-average contractual life of outstanding options (calculated as of December 31, in years)	9 months 18 days	9 months 18 days	9 months 18 days