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Segment financial information (Details)
$ in Thousands
 1 Months Ended 12 Months Ended
Sep. 30, 2020
a
MW
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2018
MWh
MW
Dec. 31, 2017
MW
Jul. 31, 2022
MW
Segment financial information              
Revenues   $ 3,682,166 $ 3,741,985 $ 2,850,379      
Depreciation and amortization   310,797 294,841 278,702      
Interest income   9,105 0 0      
Interest expense, net   208,329 116,703 99,403      
Income before income taxes   245,701 304,195 310,863      
Income taxes (benefit)   44,573 61,167 62,807      
Net income   201,128 243,028 248,056      
Preferred stock dividends of subsidiaries   1,890 1,890 1,890      
Net income for common stock   199,238 241,138 246,166      
Capital expenditures   448,296 344,037 314,524      
Assets   17,243,821 16,284,244 15,822,637      
Electric utility              
Segment financial information              
Revenues   3,269,521 3,408,587 2,539,636      
Depreciation and amortization   270,195 260,744 251,206      
Interest income   6,454          
Interest expense, net   86,140 76,416 72,447      
Income before income taxes   247,140 240,600 223,785      
Income taxes (benefit)   51,193 49,676 44,148      
Net income   195,947 190,924 179,637      
Preferred stock dividends of subsidiaries   1,995 1,995 1,995      
Net income for common stock   193,952 188,929 177,642      
Capital expenditures   438,775 329,457 292,000      
Assets   7,283,554 6,597,467 6,491,625      
Bank              
Segment financial information              
Revenues   394,663 321,068 306,398      
Depreciation and amortization   28,491 24,436 21,124      
Interest income   0          
Interest expense, net   82,797 13,301 5,040      
Income before income taxes   63,401 102,241 130,559      
Income taxes (benefit)   10,039 22,252 29,325      
Net income   53,362 79,989 101,234      
Preferred stock dividends of subsidiaries   0 0 0      
Net income for common stock   53,362 79,989 101,234      
Capital expenditures   5,569 4,704 11,131      
Assets   9,673,192 9,545,970 9,181,603      
Other              
Segment financial information              
Revenues   17,982 12,330 4,345      
Depreciation and amortization   12,111 9,661 6,372      
Interest income   2,651          
Interest expense, net   39,392 26,986 21,916      
Income before income taxes   (64,840) (38,646) (43,481)      
Income taxes (benefit)   (16,659) (10,761) (10,666)      
Net income   (48,181) (27,885) (32,815)      
Preferred stock dividends of subsidiaries   (105) (105) (105)      
Net income for common stock   (48,076) (27,780) (32,710)      
Capital expenditures   3,952 9,876 11,393      
Assets   $ 287,075 140,807 149,409      
Operating Segments              
Segment financial information              
Revenues     3,741,985 2,850,379      
Operating Segments | Electric utility              
Segment financial information              
Revenues     3,408,583 2,539,589      
Operating Segments | Bank              
Segment financial information              
Revenues     321,068 306,398      
Operating Segments | Other              
Segment financial information              
Revenues     12,334 4,392      
Intersegment eliminations              
Segment financial information              
Revenues     0 0      
Intersegment eliminations | Electric utility              
Segment financial information              
Revenues     4 47      
Intersegment eliminations | Bank              
Segment financial information              
Revenues     0 0      
Intersegment eliminations | Other              
Segment financial information              
Revenues     $ (4) $ (47)      
Hamakua Energy              
Segment financial information              
Power produced by power plants (in megawatts) | MW           60  
Mauo, LLC              
Segment financial information              
Power produced by power plants (in megawatts) | MW         8.1    
Power storage capacity (in megawatt hours) | MWh         42.6    
Power purchase agreement term (in years)         15 years    
Power purchase agreement extension term (in years)         5 years    
Ka‘ie‘ie Waho Company, LLC              
Segment financial information              
Photovoltaic system power amount (in megawatts) | MW 6            
Area of land (in acres) | a 20            
Mahipapa, LLC | Green Energy Team, LLC              
Segment financial information              
Unit of renewable energy (in mega watts) | MW             7.5