Investments - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Investments
Other income, net	$ 318,000	$ 9,000	$ 638,000	$ 23,000
Allowance for credit loss	0		0
Accrued interest receivable	200,000		200,000
Amortization of premiums and discounts on investments			372,000	0
Reclassification out of Accumulated Other Comprehensive Income
Investments
Other income, net	0	0	0	0
Other Nonoperating Income (Expense)
Investments
Interest income on investments	400,000		700,000
Amortization of premiums and discounts on investments	$ 200,000	0	$ 400,000	0
Other Nonoperating Income (Expense) | Maximum
Investments
Interest income on investments		$ 100,000		$ 100,000