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Bank segment (HEI only) - Deposit Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Weighted-average stated rate
Savings	0.03%	0.09%
Checking, interest-bearing	0.02%	0.09%
Checking, Noninterest-bearing	0.00%	0.00%
Commercial checking	0.00%	0.00%
Money market	0.09%	0.69%
Time certificates	0.99%	1.42%
Total weighted-average stated rate	0.09%	0.24%
Deposit liabilities
Savings	$ 2,873,727	$ 2,379,522
Checking
Interest-bearing	1,196,675	1,062,122
Noninterest-bearing	1,329,264	977,459
Commercial checking	1,269,236	932,223
Money market	169,225	150,751
Time certificates	548,830	769,825
Total Amount	7,386,957	6,271,902
Certificate accounts of $100,000 or more	121,300	302,000
Term certificates outstanding, scheduled maturities
2021	348,420
2022	88,675
2023	50,146
2024	33,944
2025	25,225
Thereafter	2,420
Total	548,830
Overdrawn deposit accounts classified as loans	1,000	2,400
Interest expense on deposit liabilities by type of deposit
Time certificates	7,944	12,675	$ 11,044
Savings	1,774	1,904	1,639
Money market	465	953	602
Interest-bearing checking	471	1,298	706
Interest expense on deposit liabilities	$ 10,654	$ 16,830	$ 13,991

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