Investments - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Investments
Accretion of premiums and discounts on investments	$ (412,000)	$ 279,000
Reclassification out of Accumulated Other Comprehensive Income
Investments
Unrealized gains (losses)	0	0
Interest Income
Investments
Interest income on investments	4,400,000	2,400,000
Other Nonoperating Income (Expense)
Investments
Accretion of premiums and discounts on investments	$ 400,000	$ 200,000