Investment Securities (Tables)

6 Months Ended

Jun. 30, 2023

Investments, Debt and Equity Securities [Abstract]

Summary of debt and equity securities

The following tables summarize debt and equity securities as of June 30, 2023 and December 31, 2022.

	Gross Unrealized
	(dollars in thousands)
June 30, 2023	Cost		Gains		Losses		Fair Value
Equity	$	330,886	$	209,975	$	(6,023)	$	534,838
Debt	843,576		1,057		(39,246)		805,387
Other	6,006		59		(7)		6,058
Total	$	1,180,468	$	211,091	$	(45,276)	$	1,346,283

	Gross Unrealized
	(dollars in thousands)
December 31, 2022	Cost		Gains		Losses		Fair Value
Equity	$	323,907	$	159,445	$	(8,949)	$	474,403
Debt	833,035		372		(46,369)		787,038
Other	10,445		20		(9)		10,456
Total	$	1,167,387	$	159,837	$	(55,327)	$	1,271,897