Investment Securities (Tables)

3 Months Ended

Mar. 31, 2024

Investments, Debt and Equity Securities [Abstract]

Summary of debt and equity securities

The following tables summarize debt and equity securities as of March 31, 2024 and December 31, 2023.

	Gross Unrealized
	(dollars in thousands)
March 31, 2024	Cost		Gains		Losses		Fair Value
Equity	$	350,947	$	292,940	$	(6,033)	$	637,854
Debt	903,715		2,574		(27,229)		879,060
Other	7,549		1		(10)		7,540
Total	$	1,262,211	$	295,515	$	(33,272)	$	1,524,454

	Gross Unrealized
	(dollars in thousands)
December 31, 2023	Cost		Gains		Losses		Fair Value
Equity	$	344,669	$	246,795	$	(5,549)	$	585,915
Debt	908,316		3,938		(25,181)		887,073
Other	2,889		61		(36)		2,914
Total	$	1,255,874	$	250,794	$	(30,766)	$	1,475,902