Investment Securities (Tables)

9 Months Ended

Sep. 30, 2021

Investments, Debt and Equity Securities [Abstract]

Summary of debt and equity securities

The following tables summarize debt and equity securities at September 30, 2021 and December 31, 2020.

	Gross Unrealized
	(dollars in thousands)
September 30, 2021	Cost		Gains		Losses		Fair Value
Equity	$	300,141	$	253,423	$	(4,727)	$	548,837
Debt	743,582		6,727		(3,928)		746,381
Other	19,444		—		—		19,444
Total	$	1,063,167	$	260,150	$	(8,655)	$	1,314,662

	Gross Unrealized
	(dollars in thousands)
December 31, 2020	Cost		Gains		Losses		Fair Value
Equity	$	262,564	$	219,658	$	(8,127)	$	474,095
Debt	613,271		18,090		(641)		630,720
Other	11,431		—		—		11,431
Total	$	887,266	$	237,748	$	(8,768)	$	1,116,246