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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

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