Investment Securities (Tables)

6 Months Ended

Jun. 30, 2020

Investments, Debt and Equity Securities [Abstract]

Summary of debt and equity securities

The following tables summarize debt and equity securities as of June 30, 2020 and December 31, 2019.

	Gross Unrealized
	(dollars in thousands)
June 30, 2020	Cost		Gains		Losses		Fair Value
Equity	$	256,741	$	125,801	$	(11,151)	$	371,391
Debt	440,600		21,243		(1,146)		460,697
Other	8,270		—		(10)		8,260
Total	$	705,611	$	147,044	$	(12,307)	$	840,348

	Gross Unrealized
	(dollars in thousands)
December 31, 2019	Cost		Gains		Losses		Fair Value
Equity	$	258,870	$	144,832	$	(5,990)	$	397,712
Debt	354,535		8,474		(874)		362,135
Other	6,356		—		—		6,356
Total	$	619,761	$	153,306	$	(6,864)	$	766,203