Employee Benefit Plans - Fair Value of Assets (Details) - SERP - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Employee benefit plans
Fair value of assets held in Rabbi Trust	$ 0	$ 0
Rabbi Trust | Fair Value
Employee benefit plans
Fair value of assets held in Rabbi Trust	27,531	31,468
Level 1 | Rabbi Trust
Employee benefit plans
Fair value of assets held in Rabbi Trust	27,531	31,468
Level 2 | Rabbi Trust
Employee benefit plans
Fair value of assets held in Rabbi Trust	0	0
Level 3 | Rabbi Trust
Employee benefit plans
Fair value of assets held in Rabbi Trust	0	0
Cash equivalents | Rabbi Trust | Fair Value
Employee benefit plans
Fair value of assets held in Rabbi Trust	9	8
Cash equivalents | Level 1 | Rabbi Trust
Employee benefit plans
Fair value of assets held in Rabbi Trust	9	8
Cash equivalents | Level 2 | Rabbi Trust
Employee benefit plans
Fair value of assets held in Rabbi Trust	0	0
Cash equivalents | Level 3 | Rabbi Trust
Employee benefit plans
Fair value of assets held in Rabbi Trust	0	0
Fixed income securities | Rabbi Trust | Fair Value
Employee benefit plans
Fair value of assets held in Rabbi Trust	10,962	12,442
Fixed income securities | Level 1 | Rabbi Trust
Employee benefit plans
Fair value of assets held in Rabbi Trust	10,962	12,442
Fixed income securities | Level 2 | Rabbi Trust
Employee benefit plans
Fair value of assets held in Rabbi Trust	0	0
Fixed income securities | Level 3 | Rabbi Trust
Employee benefit plans
Fair value of assets held in Rabbi Trust	0	0
Equity securities | Rabbi Trust | Fair Value
Employee benefit plans
Fair value of assets held in Rabbi Trust	16,560	19,018
Equity securities | Level 1 | Rabbi Trust
Employee benefit plans
Fair value of assets held in Rabbi Trust	16,560	19,018
Equity securities | Level 2 | Rabbi Trust
Employee benefit plans
Fair value of assets held in Rabbi Trust	0	0
Equity securities | Level 3 | Rabbi Trust
Employee benefit plans
Fair value of assets held in Rabbi Trust	$ 0	$ 0