Investment Securities - Allowance for Credit Loss Rollforward (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 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	(781)
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Securities, available-for-sale, allowance for credit loss, beginning balance	(731)	$ (1,140)
Additions for securities for which no previous expected credit losses were recognized	1	2
Change in securities for which a previous expected credit loss was recognized	(49)	(395)
Securities, available-for-sale, allowance for credit loss, ending balance	$ (781)	$ (1,537)