Investment Securities (Tables)

3 Months Ended

Mar. 31, 2020

Investments, Debt and Equity Securities [Abstract]

Summary of debt and equity securities

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

	Gross Unrealized
	(dollars in thousands)
March 31, 2020	Cost	Gains	Losses	Fair Value
Equity	$255,154	$68,633	$(19,685)	$304,102
Debt	428,691	17,399	(6,064)	440,026
Other	8,104	—	—	8,104
Total	$691,949	$86,032	$(25,749)	$752,232

	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