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Bank segment - Credit risk profile - payment activity and assigned grades (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Credit risk profile by internally assigned grade for loans
Current year	$ 162,824		$ 1,296,473
One year before current year	1,275,157		1,220,751
Two years before current year	1,212,168		808,953
Three years before current year	795,046		296,592
Four years before current year	273,757		164,815
Prior	1,204,635		1,077,705
Revolving	1,097,070		1,077,634
Converted to term loans	67,070		62,098
Total	6,087,727		6,005,021
Gross charge-offs	3,422	$ 1,558
Real estate
Credit risk profile by internally assigned grade for loans
Total	5,014,377		4,970,621
Real estate | Residential 1-4 family
Credit risk profile by internally assigned grade for loans
Current year	46,292		432,707
One year before current year	425,843		755,056
Two years before current year	750,578		423,723
Three years before current year	419,047		113,096
Four years before current year	111,556		53,117
Prior	731,000		701,938
Revolving	0		0
Converted to term loans	0		0
Total	2,484,316		2,479,637
Charge offs current year	0
Charge offs one year prior of origination year	0
Charge offs two years prior of origination year	0
Charge offs three years prior of origination year	0
Charge offs four years prior of origination year	0
Charge offs more than five years prior of origination year	809
Charge offs revolving loans	0
Charge offs converted to term loans	0
Gross charge-offs	809	0
Real estate | Home equity line of credit
Credit risk profile by internally assigned grade for loans
Current year	0		0
One year before current year	0		0
Two years before current year	0		0
Three years before current year	0		0
Four years before current year	0		0
Prior	0		0
Revolving	975,386		961,030
Converted to term loans	47,414		41,875
Total	1,022,800		1,002,905
Charge offs current year	0
Charge offs one year prior of origination year	0
Charge offs two years prior of origination year	0
Charge offs three years prior of origination year	0
Charge offs four years prior of origination year	0
Charge offs more than five years prior of origination year	0
Charge offs revolving loans	0
Charge offs converted to term loans	63
Gross charge-offs	63	0
Real estate | Residential land
Credit risk profile by internally assigned grade for loans
Current year	1,204		5,245
One year before current year	5,237		9,010
Two years before current year	8,587		5,222
Three years before current year	4,039		203
Four years before current year	0		522
Prior	994		477
Revolving	0		0
Converted to term loans	0		0
Total	20,061		20,679
Charge offs current year	0
Charge offs one year prior of origination year	0
Charge offs two years prior of origination year	0
Charge offs three years prior of origination year	0
Charge offs four years prior of origination year	0
Charge offs more than five years prior of origination year	0
Charge offs revolving loans	0
Charge offs converted to term loans	0
Gross charge-offs	0	0
Real estate | Residential construction
Credit risk profile by internally assigned grade for loans
Current year	1,444		7,986
One year before current year	6,786		11,624
Two years before current year	7,519		1,178
Three years before current year	0		0
Four years before current year	0		0
Prior	0		0
Revolving	0		0
Converted to term loans	0		0
Total	15,749		20,788
Charge offs current year	0
Charge offs one year prior of origination year	0
Charge offs two years prior of origination year	0
Charge offs three years prior of origination year	0
Charge offs four years prior of origination year	0
Charge offs more than five years prior of origination year	0
Charge offs revolving loans	0
Charge offs converted to term loans	0
Gross charge-offs	0	0
Real estate | Commercial real estate
Credit risk profile by internally assigned grade for loans
Current year	46,745		390,206
One year before current year	392,018		188,380
Two years before current year	185,905		287,432
Three years before current year	280,838		103,322
Four years before current year	93,656		63,084
Prior	369,787		317,464
Revolving	8,235		8,235
Converted to term loans	0		0
Total	1,377,184		1,358,123
Charge offs current year	0
Charge offs one year prior of origination year	0
Charge offs two years prior of origination year	0
Charge offs three years prior of origination year	0
Charge offs four years prior of origination year	0
Charge offs more than five years prior of origination year	0
Charge offs revolving loans	0
Charge offs converted to term loans	0
Gross charge-offs	0	0
Real estate | Commercial construction
Credit risk profile by internally assigned grade for loans
Current year	0		15,094
One year before current year	11,206		47,478
Two years before current year	54,924		44
Three years before current year	44		0
Four years before current year	0		0
Prior	0		0
Revolving	28,093		25,873
Converted to term loans	0		0
Total	94,267		88,489
Charge offs current year	0
Charge offs one year prior of origination year	0
Charge offs two years prior of origination year	0
Charge offs three years prior of origination year	0
Charge offs four years prior of origination year	0
Charge offs more than five years prior of origination year	0
Charge offs revolving loans	0
Charge offs converted to term loans	0
Gross charge-offs	0	0
Consumer
Credit risk profile by internally assigned grade for loans
Current year	36,997		202,061
One year before current year	192,162		21,885
Two years before current year	18,597		5,733
Three years before current year	4,405		8,132
Four years before current year	4,705		604
Prior	382		140
Revolving	9,765		10,956
Converted to term loans	5,388		5,198
Total	272,401		254,709
Charge offs current year	189
Charge offs one year prior of origination year	1,523
Charge offs two years prior of origination year	319
Charge offs three years prior of origination year	57
Charge offs four years prior of origination year	135
Charge offs more than five years prior of origination year	21
Charge offs revolving loans	15
Charge offs converted to term loans	64
Gross charge-offs	2,323	1,482
Commercial
Credit risk profile by internally assigned grade for loans
Current year	30,142		243,174
One year before current year	241,905		187,318
Two years before current year	186,058		85,621
Three years before current year	86,673		71,839
Four years before current year	63,840		47,488
Prior	102,472		57,686
Revolving	75,591		71,540
Converted to term loans	14,268		15,025
Total	800,949		779,691
Charge offs current year	0
Charge offs one year prior of origination year	0
Charge offs two years prior of origination year	51
Charge offs three years prior of origination year	0
Charge offs four years prior of origination year	0
Charge offs more than five years prior of origination year	0
Charge offs revolving loans	14
Charge offs converted to term loans	162
Gross charge-offs	227	$ 76
Pass | Real estate | Commercial real estate
Credit risk profile by internally assigned grade for loans
Current year	41,312		390,206
One year before current year	392,018		177,130
Two years before current year	174,655		283,321
Three years before current year	276,754		51,542
Four years before current year	52,121		63,084
Prior	339,660		278,280
Revolving	8,235		8,235
Converted to term loans	0		0
Total	1,284,755		1,251,798
Pass | Real estate | Commercial construction
Credit risk profile by internally assigned grade for loans
Current year	0		15,094
One year before current year	11,206		47,478
Two years before current year	54,924		44
Three years before current year	44		0
Four years before current year	0		0
Prior	0		0
Revolving	28,093		25,873
Converted to term loans	0		0
Total	94,267		88,489
Pass | Commercial
Credit risk profile by internally assigned grade for loans
Current year	30,142		239,852
One year before current year	238,671		185,013
Two years before current year	184,551		85,220
Three years before current year	86,275		68,161
Four years before current year	60,265		46,142
Prior	97,277		53,192
Revolving	66,200		60,871
Converted to term loans	12,918		13,964
Total	776,299		752,415
Special Mention | Real estate | Commercial real estate
Credit risk profile by internally assigned grade for loans
Current year	0		0
One year before current year	0		11,250
Two years before current year	11,250		3,446
Three years before current year	3,425		40,423
Four years before current year	30,179		0
Prior	21,307		24,466
Revolving	0		0
Converted to term loans	0		0
Total	66,161		79,585
Special Mention | Real estate | Commercial construction
Credit risk profile by internally assigned grade for loans
Current year	0		0
One year before current year	0		0
Two years before current year	0		0
Three years before current year	0		0
Four years before current year	0		0
Prior	0		0
Revolving	0		0
Converted to term loans	0		0
Total	0		0
Special Mention | Commercial
Credit risk profile by internally assigned grade for loans
Current year	0		0
One year before current year	0		0
Two years before current year	0		0
Three years before current year	0		2,374
Four years before current year	2,255		0
Prior	0		645
Revolving	8,492		9,005
Converted to term loans	6		8
Total	10,753		12,032
Substandard | Real estate | Commercial real estate
Credit risk profile by internally assigned grade for loans
Current year	5,433		0
One year before current year	0		0
Two years before current year	0		665
Three years before current year	659		11,357
Four years before current year	11,356		0
Prior	8,820		14,718
Revolving	0		0
Converted to term loans	0		0
Total	26,268		26,740
Substandard | Real estate | Commercial construction
Credit risk profile by internally assigned grade for loans
Current year	0		0
One year before current year	0		0
Two years before current year	0		0
Three years before current year	0		0
Four years before current year	0		0
Prior	0		0
Revolving	0		0
Converted to term loans	0		0
Total	0		0
Substandard | Commercial
Credit risk profile by internally assigned grade for loans
Current year	0		3,322
One year before current year	3,234		2,305
Two years before current year	1,507		401
Three years before current year	398		1,304
Four years before current year	1,320		1,346
Prior	5,195		3,849
Revolving	899		1,664
Converted to term loans	1,344		1,053
Total	13,897		15,244
Doubtful | Real estate | Commercial real estate
Credit risk profile by internally assigned grade for loans
Current year	0		0
One year before current year	0		0
Two years before current year	0		0
Three years before current year	0		0
Four years before current year	0		0
Prior	0		0
Revolving	0		0
Converted to term loans	0		0
Total	0		0
Doubtful | Real estate | Commercial construction
Credit risk profile by internally assigned grade for loans
Current year	0		0
One year before current year	0		0
Two years before current year	0		0
Three years before current year	0		0
Four years before current year	0		0
Prior	0		0
Revolving	0		0
Converted to term loans	0		0
Total	0		0
Doubtful | Commercial
Credit risk profile by internally assigned grade for loans
Current year	0		0
One year before current year	0		0
Two years before current year	0		0
Three years before current year	0		0
Four years before current year	0		0
Prior	0		0
Revolving	0		0
Converted to term loans	0		0
Total	0		0
Current | Real estate | Residential 1-4 family
Credit risk profile by internally assigned grade for loans
Current year	46,292		432,707
One year before current year	425,843		755,056
Two years before current year	750,578		423,455
Three years before current year	418,780		113,096
Four years before current year	110,618		51,860
Prior	727,411		698,354
Revolving	0		0
Converted to term loans	0		0
Total	2,479,522		2,474,528
Current | Real estate | Home equity line of credit
Credit risk profile by internally assigned grade for loans
Current year	0		0
One year before current year	0		0
Two years before current year	0		0
Three years before current year	0		0
Four years before current year	0		0
Prior	0		0
Revolving	973,686		959,131
Converted to term loans	46,565		40,814
Total	1,020,251		999,945
Current | Real estate | Residential land
Credit risk profile by internally assigned grade for loans
Current year	1,204		5,245
One year before current year	5,237		9,010
Two years before current year	8,587		5,222
Three years before current year	4,039		203
Four years before current year	0		522
Prior	994		477
Revolving	0		0
Converted to term loans	0		0
Total	20,061		20,679
Current | Real estate | Residential construction
Credit risk profile by internally assigned grade for loans
Current year	1,444		7,986
One year before current year	6,786		11,624
Two years before current year	7,519		1,178
Three years before current year	0		0
Four years before current year	0		0
Prior	0		0
Revolving	0		0
Converted to term loans	0		0
Total	15,749		20,788
Current | Consumer
Credit risk profile by internally assigned grade for loans
Current year	36,794		199,574
One year before current year	189,133		21,330
Two years before current year	18,047		5,543
Three years before current year	4,233		7,580
Four years before current year	4,301		527
Prior	341		140
Revolving	9,589		10,810
Converted to term loans	4,904		4,782
Total	267,342		250,286
30-59 days past due
Credit risk profile by internally assigned grade for loans
Total	5,567		5,959
30-59 days past due | Real estate | Residential 1-4 family
Credit risk profile by internally assigned grade for loans
Current year	0		0
One year before current year	0		0
Two years before current year	0		0
Three years before current year	0		0
Four years before current year	938		448
Prior	971		1,098
Revolving	0		0
Converted to term loans	0		0
Total	1,909		1,546
30-59 days past due | Real estate | Home equity line of credit
Credit risk profile by internally assigned grade for loans
Current year	0		0
One year before current year	0		0
Two years before current year	0		0
Three years before current year	0		0
Four years before current year	0		0
Prior	0		0
Revolving	781		1,103
Converted to term loans	115		209
Total	896		1,312
30-59 days past due | Real estate | Residential land
Credit risk profile by internally assigned grade for loans
Current year	0		0
One year before current year	0		0
Two years before current year	0		0
Three years before current year	0		0
Four years before current year	0		0
Prior	0		0
Revolving	0		0
Converted to term loans	0		0
Total	0		0
30-59 days past due | Real estate | Residential construction
Credit risk profile by internally assigned grade for loans
Current year	0		0
One year before current year	0		0
Two years before current year	0		0
Three years before current year	0		0
Four years before current year	0		0
Prior	0		0
Revolving	0		0
Converted to term loans	0		0
Total	0		0
30-59 days past due | Real estate | Commercial real estate
Credit risk profile by internally assigned grade for loans
Total	0		508
30-59 days past due | Real estate | Commercial construction
Credit risk profile by internally assigned grade for loans
Total	0		0
30-59 days past due | Consumer
Credit risk profile by internally assigned grade for loans
Current year	203		1,110
One year before current year	1,628		287
Two years before current year	235		65
Three years before current year	54		239
Four years before current year	170		30
Prior	11		0
Revolving	78		81
Converted to term loans	120		167
Total	2,499		1,979
30-59 days past due | Commercial
Credit risk profile by internally assigned grade for loans
Total	263		614
60-89 days past due
Credit risk profile by internally assigned grade for loans
Total	3,024		2,343
60-89 days past due | Real estate | Residential 1-4 family
Credit risk profile by internally assigned grade for loans
Current year	0		0
One year before current year	0		0
Two years before current year	0		268
Three years before current year	0		0
Four years before current year	0		0
Prior	930		90
Revolving	0		0
Converted to term loans	0		0
Total	930		358
60-89 days past due | Real estate | Home equity line of credit
Credit risk profile by internally assigned grade for loans
Current year	0		0
One year before current year	0		0
Two years before current year	0		0
Three years before current year	0		0
Four years before current year	0		0
Prior	0		0
Revolving	346		209
Converted to term loans	337		226
Total	683		435
60-89 days past due | Real estate | Residential land
Credit risk profile by internally assigned grade for loans
Current year	0		0
One year before current year	0		0
Two years before current year	0		0
Three years before current year	0		0
Four years before current year	0		0
Prior	0		0
Revolving	0		0
Converted to term loans	0		0
Total	0		0
60-89 days past due | Real estate | Residential construction
Credit risk profile by internally assigned grade for loans
Current year	0		0
One year before current year	0		0
Two years before current year	0		0
Three years before current year	0		0
Four years before current year	0		0
Prior	0		0
Revolving	0		0
Converted to term loans	0		0
Total	0		0
60-89 days past due | Real estate | Commercial real estate
Credit risk profile by internally assigned grade for loans
Total	0		217
60-89 days past due | Real estate | Commercial construction
Credit risk profile by internally assigned grade for loans
Total	0		0
60-89 days past due | Consumer
Credit risk profile by internally assigned grade for loans
Current year	0		756
One year before current year	899		163
Two years before current year	116		88
Three years before current year	59		137
Four years before current year	129		19
Prior	4		0
Revolving	16		45
Converted to term loans	117		107
Total	1,340		1,315
60-89 days past due | Commercial
Credit risk profile by internally assigned grade for loans
Total	71		18
Greater than 89 days past due
Credit risk profile by internally assigned grade for loans
Total	4,572		5,624
Greater than 89 days past due | Real estate | Residential 1-4 family
Credit risk profile by internally assigned grade for loans
Current year	0		0
One year before current year	0		0
Two years before current year	0		0
Three years before current year	267		0
Four years before current year	0		809
Prior	1,688		2,396
Revolving	0		0
Converted to term loans	0		0
Total	1,955		3,205
Greater than 89 days past due | Real estate | Home equity line of credit
Credit risk profile by internally assigned grade for loans
Current year	0		0
One year before current year	0		0
Two years before current year	0		0
Three years before current year	0		0
Four years before current year	0		0
Prior	0		0
Revolving	573		587
Converted to term loans	397		626
Total	970		1,213
Greater than 89 days past due | Real estate | Residential land
Credit risk profile by internally assigned grade for loans
Current year	0		0
One year before current year	0		0
Two years before current year	0		0
Three years before current year	0		0
Four years before current year	0		0
Prior	0		0
Revolving	0		0
Converted to term loans	0		0
Total	0		0
Greater than 89 days past due | Real estate | Residential construction
Credit risk profile by internally assigned grade for loans
Current year	0		0
One year before current year	0		0
Two years before current year	0		0
Three years before current year	0		0
Four years before current year	0		0
Prior	0		0
Revolving	0		0
Converted to term loans	0		0
Total	0		0
Greater than 89 days past due | Real estate | Commercial real estate
Credit risk profile by internally assigned grade for loans
Total	0		0
Greater than 89 days past due | Real estate | Commercial construction
Credit risk profile by internally assigned grade for loans
Total	0		0
Greater than 89 days past due | Consumer
Credit risk profile by internally assigned grade for loans
Current year	0		621
One year before current year	502		105
Two years before current year	199		37
Three years before current year	59		176
Four years before current year	105		28
Prior	26		0
Revolving	82		20
Converted to term loans	247		142
Total	1,220		1,129
Greater than 89 days past due | Commercial
Credit risk profile by internally assigned grade for loans
Total	$ 427		$ 77

X

- Definition

Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan

+ References

No definition available.

+ Details

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Namespace Prefix:	he_
Data Type:	xbrli:monetaryItemType
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X

- Definition

Financing Receivable, Excluding Accrued Interest, Revolving, Writeoff

+ References

No definition available.

+ Details

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

X

- Definition

Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years Before Current Fiscal Year, Writeoff

+ References

No definition available.

+ Details

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X

- Definition

Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Definition

Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff

+ References

No definition available.

+ Details

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Namespace Prefix:	he_
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Balance Type:	debit
Period Type:	duration

X

- Definition

Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff

+ References

No definition available.

+ Details

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

X

- Definition

Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff

+ References

No definition available.

+ Details

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

X

- Definition

Amortized cost, before allowance for credit loss, fee, and loan in process, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(7))
-URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878

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