Employee Benefit Plans - Summary of the Activity in the SERP's Projected Benefit Obligation (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Benefit obligation:
Beginning balance	$ 117,323,000	$ 122,035,000
Service cost	0	1,002,000
Interest cost	3,293,000	3,076,000
Benefits paid	(3,201,000)	(2,968,000)
Actuarial gain	(31,982,000)	(5,822,000)
Ending balance	85,433,000	117,323,000	$ 122,035,000
SERP
Benefit obligation:
Beginning balance	12,420,000	13,412,000
Service cost	0	147,000	121,000
Interest cost	318,000	291,000	347,000
Benefits paid	(348,000)	(282,000)	(291,000)
Actuarial gain	(2,811,000)	1,148,000
Ending balance	$ 9,579,000	$ 12,420,000	$ 13,412,000