Investment Securities - Allowance for Credit Loss Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Securities, available-for-sale, allowance for credit loss, beginning balance	$ (731)
Securities, available-for-sale, allowance for credit loss, ending balance	(817)
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Securities, available-for-sale, allowance for credit loss, beginning balance	(731)	$ (1,140)
Change in securities for which a previous expected credit loss was recognized	(86)	(292)
Securities, available-for-sale, allowance for credit loss, ending balance	$ (817)	$ (1,432)