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Bank segment (HEI only) - Allowance For Loan Losses (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Allowance for credit losses: |  |  |  |
Beginning balance | $ 101,201 | $ 53,355 | $ 52,119 |
Charge-offs | (9,700) | (26,154) | (28,662) |
Recoveries | 6,054 | 4,748 | 6,418 |
Net (charge-offs) recoveries | (3,646) | (21,406) | (22,244) |
Provision for credit losses | (26,425) | 49,811 | 23,480 |
Ending balance | 71,130 | 101,201 | 53,355 | $ 52,119
Average loans outstanding | $ 5,220,491 | $ 5,340,287 | $ 4,986,830 |
Net charge-offs (recoveries) to average loans | 0.07% | 0.40% | 0.45% |
Ending balance: individually evaluated for impairment |  |  | $ 2,691 |
Ending balance: collectively evaluated for impairment |  |  | 50,664 |
Financing Receivables: |  |  |  |
Loans held for investment |  |  | 5,120,664 |
Ending balance: individually evaluated for impairment |  |  | 40,737 |
Ending balance: collectively evaluated for impairment |  |  | $ 5,079,927 |
Accounting standards update, extensible Llist |  |  | Accounting Standards Update 2016-13 [Member] | Accounting Standards Update 2016-13 [Member]
Commercial |  |  |  |
Allowance for credit losses: |  |  |  |
Beginning balance | $ 25,462 | $ 10,245 | $ 9,225 |
Charge-offs | (1,561) | (5,819) | (6,811) |
Recoveries | 1,468 | 872 | 2,351 |
Net (charge-offs) recoveries | (93) | (4,947) | (4,460) |
Provision for credit losses | (9,571) | 19,242 | 5,480 |
Ending balance | 15,798 | 25,462 | 10,245 | $ 9,225
Average loans outstanding | $ 856,226 | $ 935,663 | $ 620,206 |
Net charge-offs (recoveries) to average loans | 0.01% | 0.53% | 0.72% |
Ending balance: individually evaluated for impairment |  |  | $ 1,015 |
Ending balance: collectively evaluated for impairment |  |  | 9,230 |
Financing Receivables: |  |  |  |
Loans held for investment |  |  | 670,674 |
Ending balance: individually evaluated for impairment |  |  | 8,418 |
Ending balance: collectively evaluated for impairment |  |  | 662,256 |
Consumer |  |  |  |
Allowance for credit losses: |  |  |  |
Beginning balance | $ 23,950 | $ 16,206 | 16,769 |
Charge-offs | (8,027) | (19,900) | (21,677) |
Recoveries | 4,320 | 3,381 | 2,967 |
Net (charge-offs) recoveries | (3,707) | (16,519) | (18,710) |
Provision for credit losses | (4,659) | 7,800 | 18,147 |
Ending balance | 15,584 | 23,950 | 16,206 | 16,769
Average loans outstanding | $ 135,609 | $ 215,994 | $ 270,340 |
Net charge-offs (recoveries) to average loans | 2.73% | 7.65% | 6.92% |
Ending balance: individually evaluated for impairment |  |  | $ 454 |
Ending balance: collectively evaluated for impairment |  |  | 15,752 |
Financing Receivables: |  |  |  |
Loans held for investment |  |  | 257,921 |
Ending balance: individually evaluated for impairment |  |  | 507 |
Ending balance: collectively evaluated for impairment |  |  | 257,414 |
Impact of adoption of ASU No. 2016-13 |  |  |  |
Allowance for credit losses: |  |  |  |
Beginning balance |  | $ 19,441 |  |
Ending balance |  |  | 19,441 |
Impact of adoption of ASU No. 2016-13 | Commercial |  |  |  |
Allowance for credit losses: |  |  |  |
Beginning balance |  | 922 |  |
Ending balance |  |  | 922 |
Impact of adoption of ASU No. 2016-13 | Consumer |  |  |  |
Allowance for credit losses: |  |  |  |
Beginning balance |  | 16,463 |  |
Ending balance |  |  | 16,463 |
Residential 1-4 family | Real estate |  |  |  |
Allowance for credit losses: |  |  |  |
Beginning balance | $ 4,600 | 2,380 | 1,976 |
Charge-offs | (67) | (7) | (26) |
Recoveries | 92 | 394 | 854 |
Net (charge-offs) recoveries | 25 | 387 | 828 |
Provision for credit losses | 1,920 | (317) | (424) |
Ending balance | 6,545 | 4,600 | 2,380 | 1,976
Average loans outstanding | $ 2,155,322 | $ 2,148,848 | $ 2,164,759 |
Net charge-offs (recoveries) to average loans | 0.00% | (0.02%) | (0.04%) |
Ending balance: individually evaluated for impairment |  |  | $ 898 |
Ending balance: collectively evaluated for impairment |  |  | 1,482 |
Financing Receivables: |  |  |  |
Loans held for investment |  |  | 2,178,135 |
Ending balance: individually evaluated for impairment |  |  | 15,600 |
Ending balance: collectively evaluated for impairment |  |  | 2,162,535 |
Residential 1-4 family | Impact of adoption of ASU No. 2016-13 | Real estate |  |  |  |
Allowance for credit losses: |  |  |  |
Beginning balance |  | $ 2,150 |  |
Ending balance |  |  | 2,150 |
Commercial real estate | Real estate |  |  |  |
Allowance for credit losses: |  |  |  |
Beginning balance | $ 35,607 | 15,053 | 14,505 |
Charge-offs | 0 | 0 | 0 |
Recoveries | 0 | 0 | 0 |
Net (charge-offs) recoveries | 0 | 0 | 0 |
Provision for credit losses | (10,911) | 20,346 | 548 |
Ending balance | 24,696 | 35,607 | 15,053 | 14,505
Average loans outstanding | $ 1,046,276 | $ 861,096 | $ 781,531 |
Net charge-offs (recoveries) to average loans | 0.00% | 0.00% | 0.00% |
Ending balance: individually evaluated for impairment |  |  | $ 2 |
Ending balance: collectively evaluated for impairment |  |  | 15,051 |
Financing Receivables: |  |  |  |
Loans held for investment |  |  | 824,830 |
Ending balance: individually evaluated for impairment |  |  | 1,048 |
Ending balance: collectively evaluated for impairment |  |  | 823,782 |
Commercial real estate | Impact of adoption of ASU No. 2016-13 | Real estate |  |  |  |
Allowance for credit losses: |  |  |  |
Beginning balance |  | $ 208 |  |
Ending balance |  |  | 208 |
Home equity line of credit | Real estate |  |  |  |
Allowance for credit losses: |  |  |  |
Beginning balance | $ 6,813 | 6,922 | 6,371 |
Charge-offs | (45) | (77) | (144) |
Recoveries | 113 | 63 | 17 |
Net (charge-offs) recoveries | 68 | (14) | (127) |
Provision for credit losses | (1,224) | 446 | 678 |
Ending balance | 5,657 | 6,813 | 6,922 | 6,371
Average loans outstanding | $ 885,759 | $ 1,060,444 | $ 1,043,479 |
Net charge-offs (recoveries) to average loans | (0.01%) | 0.00% | 0.01% |
Ending balance: individually evaluated for impairment |  |  | $ 322 |
Ending balance: collectively evaluated for impairment |  |  | 6,600 |
Financing Receivables: |  |  |  |
Loans held for investment |  |  | 1,092,125 |
Ending balance: individually evaluated for impairment |  |  | 12,073 |
Ending balance: collectively evaluated for impairment |  |  | 1,080,052 |
Home equity line of credit | Impact of adoption of ASU No. 2016-13 | Real estate |  |  |  |
Allowance for credit losses: |  |  |  |
Beginning balance |  | $ (541) |  |
Ending balance |  |  | (541) |
Residential land | Real estate |  |  |  |
Allowance for credit losses: |  |  |  |
Beginning balance | $ 609 | 449 | 479 |
Charge-offs | 0 | (351) | (4) |
Recoveries | 61 | 38 | 229 |
Net (charge-offs) recoveries | 61 | (313) | 225 |
Provision for credit losses | (24) | 537 | (255) |
Ending balance | 646 | 609 | 449 | 479
Average loans outstanding | $ 18,227 | $ 13,799 | $ 14,065 |
Net charge-offs (recoveries) to average loans | (0.33%) | 2.27% | (1.60%) |
Ending balance: individually evaluated for impairment |  |  | $ 0 |
Ending balance: collectively evaluated for impairment |  |  | 449 |
Financing Receivables: |  |  |  |
Loans held for investment |  |  | 14,704 |
Ending balance: individually evaluated for impairment |  |  | 3,091 |
Ending balance: collectively evaluated for impairment |  |  | 11,613 |
Residential land | Impact of adoption of ASU No. 2016-13 | Real estate |  |  |  |
Allowance for credit losses: |  |  |  |
Beginning balance |  | $ (64) |  |
Ending balance |  |  | (64) |
Commercial construction | Real estate |  |  |  |
Allowance for credit losses: |  |  |  |
Beginning balance | $ 4,149 | 2,097 | 2,790 |
Charge-offs | 0 | 0 | 0 |
Recoveries | 0 | 0 | 0 |
Net (charge-offs) recoveries | 0 | 0 | 0 |
Provision for credit losses | (1,963) | 1,763 | (693) |
Ending balance | 2,186 | 4,149 | 2,097 | 2,790
Average loans outstanding | $ 111,711 | $ 93,740 | $ 81,937 |
Net charge-offs (recoveries) to average loans | 0.00% | 0.00% | 0.00% |
Ending balance: individually evaluated for impairment |  |  | $ 0 |
Ending balance: collectively evaluated for impairment |  |  | 2,097 |
Financing Receivables: |  |  |  |
Loans held for investment |  |  | 70,605 |
Ending balance: individually evaluated for impairment |  |  | 0 |
Ending balance: collectively evaluated for impairment |  |  | 70,605 |
Commercial construction | Impact of adoption of ASU No. 2016-13 | Real estate |  |  |  |
Allowance for credit losses: |  |  |  |
Beginning balance |  | $ 289 |  |
Ending balance |  |  | 289 |
Residential construction | Real estate |  |  |  |
Allowance for credit losses: |  |  |  |
Beginning balance | $ 11 | 3 | 4 |
Charge-offs | 0 | 0 | 0 |
Recoveries | 0 | 0 | 0 |
Net (charge-offs) recoveries | 0 | 0 | 0 |
Provision for credit losses | 7 | (6) | (1) |
Ending balance | 18 | 11 | 3 | $ 4
Average loans outstanding | $ 11,361 | $ 10,703 | $ 10,513 |
Net charge-offs (recoveries) to average loans | 0.00% | 0.00% | 0.00% |
Ending balance: individually evaluated for impairment |  |  | $ 0 |
Ending balance: collectively evaluated for impairment |  |  | 3 |
Financing Receivables: |  |  |  |
Loans held for investment |  |  | 11,670 |
Ending balance: individually evaluated for impairment |  |  | 0 |
Ending balance: collectively evaluated for impairment |  |  | 11,670 |
Residential construction | Impact of adoption of ASU No. 2016-13 | Real estate |  |  |  |
Allowance for credit losses: |  |  |  |
Beginning balance |  | $ 14 |  |
Ending balance |  |  | $ 14 |

X
- Definition Financing Receivable, Average Outstanding + References No definition available. + Details
Name: | he_FinancingReceivableAverageOutstanding
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Financing Receivable, Net Charge-offs (Recoveries) To Average Loans + References No definition available. + Details
Name: | he_FinancingReceivableNetChargeOffsRecoveriesToAverageLoans
Namespace Prefix: | he_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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