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Segment financial information (Tables)
3 Months Ended
Mar. 31, 2021
Segment Reporting [Abstract]  
Schedule of segment financial information
(in thousands) Electric utilityBankOtherTotal
Three months ended March 31, 2021    
Revenues from external customers$564,855 $77,131 $960 $642,946 
Intersegment revenues (eliminations)— (9)— 
Revenues$564,864 $77,131 $951 $642,946 
Income (loss) before income taxes$55,090 $37,102 $(11,996)$80,196 
Income taxes (benefit)11,233 7,546 (3,414)15,365 
Net income (loss)43,857 29,556 (8,582)64,831 
Preferred stock dividends of subsidiaries499 — (26)473 
Net income (loss) for common stock$43,358 $29,556 $(8,556)$64,358 
Total assets (at March 31, 2021)
$6,494,908 $8,718,024 $145,741 $15,358,673 
Three months ended March 31, 2020    
Revenues from external customers$597,430 $79,738 $18 $677,186 
Intersegment revenues (eliminations)12 — (12)— 
Revenues$597,442 $79,738 $$677,186 
Income (loss) before income taxes$29,686 $18,969 $(8,959)$39,696 
Income taxes (benefit)5,282 3,208 (2,687)5,803 
Net income (loss)24,404 15,761 (6,272)33,893 
Preferred stock dividends of subsidiaries499 — (26)473 
Net income (loss) for common stock $23,905 $15,761 $(6,246)$33,420 
Total assets (at December 31, 2020)$6,457,373 $8,396,533 $150,101 $15,004,007