Postretirement Benefits - Schedule of Information Regarding the SERP (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Retirement Benefits [Abstract]
Premiums paid for insurance coverage	$ 443	$ 443
Total investments:
COLI	55,974		$ 55,185
Exchange traded funds	90,514		86,156
Total investments of SERP	$ 146,488		$ 141,341