Fair Value of Financial Instruments - Reconciliation Of Assets Measured at Fair Value On A Recurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Corporate Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 7,968	$ 19,000
Realized Gains (Losses) Included in Net Income	0	0
Unrealized Gains (Losses) Included in Other Comprehensive Loss	19	(1,532)
Purchases	0	0
Sales	0	0
Maturities, Prepayments, and Calls	0	0
Transfers Into Level 3	0	0
Transfers Out of Level 3	0	(9,500)
Ending balance	7,987	7,968
Municipal Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	20,847	34,768
Realized Gains (Losses) Included in Net Income	0	0
Unrealized Gains (Losses) Included in Other Comprehensive Loss	(3,398)	(2,228)
Purchases	9,938	0
Sales	0	0
Maturities, Prepayments, and Calls	(1,080)	(1,798)
Transfers Into Level 3	0	0
Transfers Out of Level 3	0	(9,895)
Ending balance	$ 26,307	$ 20,847