Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Net federal income tax liability, current	$ 21,400	$ 19,900
Deferred tax assets, valuation allowance	69,637	83,428
Unrecognized tax benefits that would impact effective tax rate	2,800
Unrecognized tax (benefits) and expenses, interest and penalties charged to income	(200)	700
Unrecognized tax benefits decreased amount	900
Decrease in unrecognized tax benefits is reasonably possible	400
Interest and Penalties
Unrecognized tax benefits that would impact effective tax rate	2,100
US Treasury Securities
Debt securities	$ 596,400	$ 354,100