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Segment financial information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Segment financial information      
Revenues $ 642,946 $ 677,186  
Income (loss) before income taxes 80,196 39,696  
Income taxes (benefit) 15,365 5,803  
Net income 64,831 33,893  
Preferred stock dividends of subsidiaries 473 473  
Net income for common stock 64,358 33,420  
Total assets 15,358,673   $ 15,004,007
Revenues from external customers      
Segment financial information      
Revenues 642,946 677,186  
Intersegment revenues (eliminations)      
Segment financial information      
Revenues 0 0  
Electric utility      
Segment financial information      
Revenues 564,864 597,442  
Income (loss) before income taxes 55,090 29,686  
Income taxes (benefit) 11,233 5,282  
Net income 43,857 24,404  
Preferred stock dividends of subsidiaries 499 499  
Net income for common stock 43,358 23,905  
Total assets 6,494,908   6,457,373
Electric utility | Revenues from external customers      
Segment financial information      
Revenues 564,855 597,430  
Electric utility | Intersegment revenues (eliminations)      
Segment financial information      
Revenues 9 12  
Bank      
Segment financial information      
Revenues 77,131 79,738  
Income (loss) before income taxes 37,102 18,969  
Income taxes (benefit) 7,546 3,208  
Net income 29,556 15,761  
Preferred stock dividends of subsidiaries 0 0  
Net income for common stock 29,556 15,761  
Total assets 8,718,024    
Bank | Revenues from external customers      
Segment financial information      
Revenues 77,131 79,738  
Bank | Intersegment revenues (eliminations)      
Segment financial information      
Revenues 0 0  
Other      
Segment financial information      
Revenues 951 6  
Income (loss) before income taxes (11,996) (8,959)  
Income taxes (benefit) (3,414) (2,687)  
Net income (8,582) (6,272)  
Preferred stock dividends of subsidiaries (26) (26)  
Net income for common stock (8,556) (6,246)  
Total assets 145,741   $ 150,101
Other | Revenues from external customers      
Segment financial information      
Revenues 960 18  
Other | Intersegment revenues (eliminations)      
Segment financial information      
Revenues $ (9) $ (12)