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Bank subsidiary (HEI only) (Details 15) (USD $)	12 Months Ended
	Dec. 31, 2013 contract	Dec. 31, 2012 contract	Dec. 31, 2011 contract
Loan modifications determined to be troubled debt restructurings
Commitments to Borrowers whose Loan Terms are Impaired or Modified under Troubled Debt Restructuring	$ 300,000
Troubled debt restructurings real estate loans
Loan modifications determined to be troubled debt restructurings
Number of contracts	66	80	146
Pre-modification outstanding recorded investment	20,374,000	17,537,000	56,665,000
Post-modification outstanding recorded investment	20,199,000	16,299,000	55,266,000
Minimum period of payment default of loans determined to be TDRs	90 days	90 days	90 days
Troubled debt restructurings that subsequently defaulted
Loan modifications determined to be troubled debt restructurings
Number of contracts	3	1	5
Recorded investment	727,000	482,000	1,327,000
Residential 1-4 family | Troubled debt restructurings real estate loans
Loan modifications determined to be troubled debt restructurings
Number of contracts	34	35	42
Pre-modification outstanding recorded investment	8,876,000	8,805,000	11,233,000
Post-modification outstanding recorded investment	8,957,000	8,232,000	9,853,000
Home equity line of credit | Troubled debt restructurings real estate loans
Loan modifications determined to be troubled debt restructurings
Number of contracts	5	0	1
Pre-modification outstanding recorded investment	637,000	0	93,000
Post-modification outstanding recorded investment	390,000	0	93,000
Home equity line of credit | Troubled debt restructurings that subsequently defaulted
Loan modifications determined to be troubled debt restructurings
Number of contracts	1
Recorded investment	67,000
Residential land | Troubled debt restructurings real estate loans
Loan modifications determined to be troubled debt restructurings
Number of contracts	20	26	46
Pre-modification outstanding recorded investment	6,215,000	6,149,000	9,965,000
Post-modification outstanding recorded investment	6,206,000	5,484,000	9,946,000
Residential land | Troubled debt restructurings that subsequently defaulted
Loan modifications determined to be troubled debt restructurings
Number of contracts		0	1
Recorded investment		0	528,000
Commercial loans | Troubled debt restructurings real estate loans
Loan modifications determined to be troubled debt restructurings
Number of contracts	7	19	56
Pre-modification outstanding recorded investment	4,646,000	2,583,000	35,349,000
Post-modification outstanding recorded investment	4,646,000	2,583,000	35,349,000
Commercial loans | Troubled debt restructurings that subsequently defaulted
Loan modifications determined to be troubled debt restructurings
Number of contracts	2	1	4
Recorded investment	660,000	482,000	799,000
Consumer loans | Troubled debt restructurings real estate loans
Loan modifications determined to be troubled debt restructurings
Number of contracts		0	1
Pre-modification outstanding recorded investment		0	25,000
Post-modification outstanding recorded investment		$ 0	$ 25,000

X

- Definition

Represents the commitments to borrowers whose loan terms are impaired or modified under troubled debt restructuring.

+ References

No definition available.

+ Details

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Namespace Prefix:	he_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents the minimum period of payment default of loans determined to be troubled debt restructurings.

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Definition

The number of contracts under financing receivables that have been modified by troubled debt restructurings during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	he_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of the outstanding recorded investment in financial receivables after the financial receivables being modified as troubled debt restructurings.

+ References

No definition available.

+ Details

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Namespace Prefix:	he_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of the outstanding recorded investment in financial receivables prior to the financial receivables being modified as troubled debt restructurings.

+ References

No definition available.

+ Details

Name:	he_FinancingReceivablesModificationsPreModificationRecordedInvestment
Namespace Prefix:	he_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Details

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Data Type:	xbrli:stringItemType
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Period Type:	duration

X

- Definition

The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 40

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6951948&loc=d3e18845-111554

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