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Segment financial information (Tables)
 6 Months Ended
Jun. 30, 2023
Segment Reporting [Abstract]  
Schedule of Segment Financial Information
(in thousands) Electric utilityBankOtherTotal
Three months ended June 30, 2023    
Revenues$794,191 $96,885 $4,609 $895,685 
Income (loss) before income taxes$58,868 $25,055 $(14,556)$69,367 
Income taxes (benefit)13,070 4,851 (3,637)14,284 
Net income (loss)45,798 20,204 (10,919)55,083 
Preferred stock dividends of subsidiaries499 — (26)473 
Net income (loss) for common stock$45,299 $20,204 $(10,893)$54,610 
Six months ended June 30, 2023    
Revenues $1,624,552 $190,742 $8,628 $1,823,922 
Income (loss) before income taxes$119,976 $48,762 $(29,067)$139,671 
Income taxes (benefit)26,670 9,996 (7,272)29,394 
Net income (loss)93,306 38,766 (21,795)110,277 
Preferred stock dividends of subsidiaries998 — (52)946 
Net income (loss) for common stock$92,308 $38,766 $(21,743)$109,331 
Total assets (at June 30, 2023)
$6,761,593 $9,620,691 $137,025 $16,519,309 
Three months ended June 30, 2022    
Revenues$818,873 $75,324 $1,410 $895,607 
Income (loss) before income taxes$56,613 $22,109 $(12,505)$66,217 
Income taxes (benefit)11,979 4,643 (3,419)13,203 
Net income (loss)44,634 17,466 (9,086)53,014 
Preferred stock dividends of subsidiaries499 — (26)473 
Net income (loss) for common stock $44,135 $17,466 $(9,060)$52,541 
Six months ended June 30, 2022    
Revenues from external customers and other sources$1,527,661 $150,439 $2,575 $1,680,675 
Intersegment revenues (eliminations)4 — (4)— 
Revenues$1,527,665 $150,439 $2,571 $1,680,675 
Income (loss) before income taxes$116,059 $52,324 $(14,686)$153,697 
Income taxes (benefit)24,517 10,988 (4,462)31,043 
Net income (loss)91,542 41,336 (10,224)122,654 
Preferred stock dividends of subsidiaries998 — (52)946 
Net income (loss) for common stock $90,544 $41,336 $(10,172)$121,708 
Total assets (at December 31, 2022)
$6,597,467 $9,545,970 $140,807 $16,284,244