Bank segment (HEI only) - Deposit Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Weighted-average stated rate
Savings	0.09%	0.07%
Checking, interest-bearing	0.09%	0.09%
Checking, Noninterest-bearing	0.00%	0.00%
Commercial checking	0.00%	0.00%
Money market	0.69%	0.63%
Time certificates	1.42%	1.61%
Total weighted-average stated rate	0.24%	0.27%
Deposit liabilities
Savings	$ 2,379,522	$ 2,322,552
Checking
Interest-bearing	1,062,122	1,055,019
Noninterest-bearing	977,459	932,608
Commercial checking	932,223	868,119
Money market	150,751	152,713
Time certificates	769,825	827,841
Total Amount	6,271,902	6,158,852
Certificate accounts of $100,000 or more	456,500	500,200
Term certificates outstanding, scheduled maturities
2020	503,214
2021	112,632
2022	87,132
2023	29,134
2024	35,253
Thereafter	2,460
Total	769,825
Overdrawn deposit accounts classified as loans	2,400	2,100
Interest expense on deposit liabilities by type of deposit
Time certificates	12,675	11,044	$ 7,687
Savings	1,904	1,639	1,567
Money market	953	602	168
Interest-bearing checking	1,298	706	238
Interest expense on deposit liabilities	$ 16,830	$ 13,991	$ 9,660