Employee Benefit Plans - Fair Value of Assets (Details) - SERP - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Employee benefit plans
Total investments measured at fair value	$ 0	$ 0
Rabbi Trust | Fair Value
Employee benefit plans
Total investments measured at fair value	34,143	27,531
Level 1 | Rabbi Trust
Employee benefit plans
Total investments measured at fair value	34,143	27,531
Level 2 | Rabbi Trust
Employee benefit plans
Total investments measured at fair value	0	0
Level 3 | Rabbi Trust
Employee benefit plans
Total investments measured at fair value	0	0
Cash equivalents | Rabbi Trust | Fair Value
Employee benefit plans
Total investments measured at fair value	6	9
Cash equivalents | Level 1 | Rabbi Trust
Employee benefit plans
Total investments measured at fair value	6	9
Cash equivalents | Level 2 | Rabbi Trust
Employee benefit plans
Total investments measured at fair value	0	0
Cash equivalents | Level 3 | Rabbi Trust
Employee benefit plans
Total investments measured at fair value	0	0
Fixed income securities | Rabbi Trust | Fair Value
Employee benefit plans
Total investments measured at fair value	13,676	10,962
Fixed income securities | Level 1 | Rabbi Trust
Employee benefit plans
Total investments measured at fair value	13,676	10,962
Fixed income securities | Level 2 | Rabbi Trust
Employee benefit plans
Total investments measured at fair value	0	0
Fixed income securities | Level 3 | Rabbi Trust
Employee benefit plans
Total investments measured at fair value	0	0
Equity securities | Rabbi Trust | Fair Value
Employee benefit plans
Total investments measured at fair value	20,461	16,560
Equity securities | Level 1 | Rabbi Trust
Employee benefit plans
Total investments measured at fair value	20,461	16,560
Equity securities | Level 2 | Rabbi Trust
Employee benefit plans
Total investments measured at fair value	0	0
Equity securities | Level 3 | Rabbi Trust
Employee benefit plans
Total investments measured at fair value	$ 0	$ 0