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Investments Securities
 9 Months Ended
Sep. 30, 2021
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 at September 30, 2021 and December 31, 2020.
Gross Unrealized
(dollars in thousands)
September 30, 2021CostGainsLossesFair
Value
Equity$300,141 $253,423 $(4,727)$548,837 
Debt743,582 6,727 (3,928)746,381 
Other19,444 — — 19,444 
Total$1,063,167 $260,150 $(8,655)$1,314,662 
Gross Unrealized
(dollars in thousands)
December 31, 2020CostGainsLossesFair
Value
Equity$262,564 $219,658 $(8,127)$474,095 
Debt613,271 18,090 (641)630,720 
Other11,431 — — 11,431 
Total$887,266 $237,748 $(8,768)$1,116,246