Investments Securities

3 Months Ended

Mar. 31, 2023

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 March 31, 2023 and December 31, 2022.

	Gross Unrealized
	(dollars in thousands)
March 31, 2023	Cost		Gains		Losses		Fair Value
Equity	$	324,488	$	191,858	$	(7,030)	$	509,316
Debt	830,095		1,698		(34,803)		796,990
Other	9,885		30		(26)		9,889
Total	$	1,164,468	$	193,586	$	(41,859)	$	1,316,195

	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