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Segment financial information (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Feb. 02, 2018
MWh
MW
Dec. 26, 2017
USD ($)
Nov. 24, 2017
MW
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
MW
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Segment financial information                            
Revenues       $ 658,597 $ 673,185 $ 632,281 $ 591,562 $ 617,395 $ 646,055 $ 566,244 $ 550,960 $ 2,555,625 $ 2,380,654 $ 2,602,982
Depreciation and amortization                       221,998 204,746 195,585
Interest expense, net                       91,128 88,558 88,476
Income (loss) before income taxes                       276,580 373,841 254,788
Income taxes (benefit)                       109,393 123,695 93,021
Net income (loss)       32,843 60,544 39,134 34,666 45,107 127,613 44,601 32,825 167,187 250,146 161,767
Preferred stock dividends of subsidiaries                       1,890 1,890 1,890
Net income for common stock       32,370 $ 60,073 $ 38,661 $ 34,193 44,634 $ 127,142 $ 44,128 $ 32,352 165,297 248,256 159,877
Capital expenditures                       495,187 330,043 363,804
Assets       13,099,828       12,425,506       13,099,828 12,425,506 11,782,018
Electric utility                            
Segment financial information                            
Revenues                       2,257,566 2,094,368 2,335,166
Depreciation and amortization                       201,282 193,996 186,319
Interest expense, net                       69,637 66,824 66,370
Income (loss) before income taxes                       205,145 229,113 217,131
Income taxes (benefit)                       83,199 84,801 79,422
Net income (loss)                       121,946 144,312 137,709
Preferred stock dividends of subsidiaries                       1,995 1,995 1,995
Net income for common stock                       119,951 142,317 135,714
Capital expenditures                       441,598 320,437 350,161
Assets       6,196,281       5,975,428       6,196,281 5,975,428 5,672,210
Bank                            
Segment financial information                            
Revenues                       297,640 285,924 267,733
Depreciation and amortization                       19,416 9,813 7,928
Interest expense, net                       12,156 12,755 11,326
Income (loss) before income taxes                       98,716 87,352 83,812
Income taxes (benefit)                       31,719 30,073 29,082
Net income (loss)                       66,997 57,279 54,730
Preferred stock dividends of subsidiaries                       0 0 0
Net income for common stock                       66,997 57,279 54,730
Capital expenditures                       53,272 9,394 13,470
Assets       6,798,659       6,421,357       6,798,659 6,421,357 6,014,755
Other                            
Segment financial information                            
Revenues                       419 362 83
Depreciation and amortization                       1,300 937 1,338
Interest expense, net                       9,335 8,979 10,780
Income (loss) before income taxes                       (27,281) 57,376 (46,155)
Income taxes (benefit)                       (5,525) 8,821 (15,483)
Net income (loss)                       (21,756) 48,555 (30,672)
Preferred stock dividends of subsidiaries                       (105) (105) (105)
Net income for common stock                       (21,651) 48,660 (30,567)
Capital expenditures                       317 212 173
Assets       $ 104,888       $ 28,721       104,888 28,721 95,053
Operating Segments                            
Segment financial information                            
Revenues                       2,555,625 2,380,654 2,602,982
Operating Segments | Electric utility                            
Segment financial information                            
Revenues                       2,257,455 2,094,224 2,335,135
Operating Segments | Bank                            
Segment financial information                            
Revenues                       297,640 285,924 267,733
Operating Segments | Other                            
Segment financial information                            
Revenues                       530 506 114
Intersegment eliminations                            
Segment financial information                            
Revenues                       0 0 0
Intersegment eliminations | Electric utility                            
Segment financial information                            
Revenues                       111 144 31
Intersegment eliminations | Bank                            
Segment financial information                            
Revenues                       0 0 0
Intersegment eliminations | Other                            
Segment financial information                            
Revenues                       $ (111) $ (144) $ (31)
Hamakua Energy Partners, L.P. (HEP)                            
Segment financial information                            
Power produced by power plants (in megawatts) | MW     60                 60    
Hamakua Energy Partners, L.P. (HEP) | Secured Debt                            
Segment financial information                            
Proceeds from issuance of secured notes   $ 67,000                        
Debt instrument, stated interest rate       4.02%               4.02%    
Mauo, LLC | Subsequent Event                            
Segment financial information                            
Power produced by power plants (in megawatts) | MW 8.6                          
Power storage capacity (in megawatt hours) | MWh 42.3                          
Power purchase agreement term 15 years                          
Power purchase agreement extension term 5 years