Other Employee Benefits - Schedule of Shares Purchased in Open Market for Employees (Details) - USD ($)													12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation Expense													$ 7,654,000	$ 7,075,000	$ 5,960,000
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares (in shares)	5,583	5,203	3,527	3,284	3,550	4,015	2,737	3,922	3,339	4,511	2,465	2,905	17,597	14,224	13,220
Common Stock Fair Value (in dollars per share)	$ 22.25	$ 25.61	$ 28.34	$ 35.63	$ 30.48	$ 28.19	$ 29.60	$ 23.93	$ 27.39	$ 22.34	$ 29.35	$ 30.74	$ 26.96	$ 27.86	$ 26.77
Purchase Price (in dollars per share)	$ 18.91	$ 21.77	$ 24.09	$ 30.29	$ 25.91	$ 23.96	$ 25.16	$ 20.34	$ 23.28	$ 18.99	$ 24.94	$ 26.13	$ 22.92	$ 23.68	$ 22.75
Compensation Expense	$ 18,633	$ 19,987	$ 14,993	$ 17,550	$ 16,231	$ 16,977	$ 12,152	$ 14,078	$ 13,723	$ 15,116	$ 10,873	$ 13,395	$ 71,163	$ 59,438	$ 53,107