Investments Securities

9 Months Ended

Sep. 30, 2022

Investments, Debt and Equity Securities [Abstract]

Investment Securities

Investment Securities.    Investment securities we hold are recorded at fair value in the accompanying consolidated balance sheets. We apply regulated operations accounting to the unrealized gains and losses of all investment securities. All realized and unrealized gains and losses are determined using the specific identification method.

The following tables summarize debt and equity securities as of September 30, 2022 and December 31, 2021.

	Gross Unrealized
	(dollars in thousands)
September 30, 2022	Cost		Gains		Losses		Fair Value
Equity	$	315,378	$	121,785	$	(8,879)	$	428,284
Debt	799,133		298		(53,665)		745,766
Other	11,853		66		(45)		11,874
Total	$	1,126,364	$	122,149	$	(62,589)	$	1,185,924

	Gross Unrealized
	(dollars in thousands)
December 31, 2021	Cost		Gains		Losses		Fair Value
Equity	$	304,305	$	280,127	$	(4,682)	$	579,750
Debt	774,580		4,859		(7,001)		772,438
Other	19,102		—		(1)		19,101
Total	$	1,097,987	$	284,986	$	(11,684)	$	1,371,289