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Bank segment (HEI only) - Mortgage Servicing Rights and Valuation Allowance Roll Forward (Details) - American Savings Bank (ASB) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Mortgage Servicing Rights [Roll Forward] |  |  |
Beginning balance | $ 8,639 |  |
Ending balance | 8,062 | $ 8,639 |
Allowance for mortgage-servicing assets – bank |  |  |
Mortgage Servicing Rights [Roll Forward] |  |  |
Beginning balance | 8,639 | 9,373 | $ 8,884
Amount capitalized | 1,045 | 1,239 | 2,740
Amortization | (1,622) | (1,973) | (2,251)
Sale of mortgage servicing rights | 0 | 0 | 0
Other-than-temporary impairment | 0 | 0 | 0
Ending balance | 8,062 | 8,639 | 9,373
Valuation Allowance [Roll Forward] |  |  |
Valuation allowance, beginning balance | 0 | 0 | 0
Provision (recovery) | 0 | 0 | 0
Other-than-temporary impairment | 0 | 0 | 0
Valuation allowance, ending balance | 0 | 0 | 0
Net carrying amount | 8,062 | $ 8,639 | $ 9,373
Estimated Aggregate Amortization Expenses of Mortgage Servicing Rights [Abstract] |  |  |
2019 | 1,100 |  |
2020 | 1,000 |  |
2021 | 900 |  |
2022 | 800 |  |
2023 | $ 700 |  |
Measurement Band A |  |  |
Estimated Aggregate Amortization Expenses of Mortgage Servicing Rights [Abstract] |  |  |
Risks inherent in servicing assets and servicing liabilities band percent for risk categorization | 0.50% |  |
Measurement Band B |  |  |
Estimated Aggregate Amortization Expenses of Mortgage Servicing Rights [Abstract] |  |  |
Risks inherent in servicing assets and servicing liabilities band percent for risk categorization | 1.00% |  |

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- Definition Estimated Aggregate Amortization Expenses of Mortgage Servicing Rights [Abstract] + References No definition available. + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of other-than-temporary impairment (OTTI) applied to contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122739-111746 + Details
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