Bank segment (HEI only) - Collateral-Dependent Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Nonaccrual [Line Items]
Amortized cost			$ 5,120,664
Consumer mortgage loans collateralized by residential real estate property in foreclosure process	$ 3,400	$ 3,800
Commercial
Financing Receivable, Nonaccrual [Line Items]
Amortized cost			$ 670,674
Residential real estate property | Real estate | Residential 1-4 family
Financing Receivable, Nonaccrual [Line Items]
Amortized cost	3,493	2,541
Residential real estate property | Real estate | Home equity  line of credit
Financing Receivable, Nonaccrual [Line Items]
Amortized cost	1,294	1,567
Residential real estate property | Real estate | Residential land
Financing Receivable, Nonaccrual [Line Items]
Amortized cost	300	300
Commercial real estate | Real estate | Commercial real estate
Financing Receivable, Nonaccrual [Line Items]
Amortized cost	1,221	2,875
Business assets | Commercial
Financing Receivable, Nonaccrual [Line Items]
Amortized cost	692	934
Collateral Pledged
Financing Receivable, Nonaccrual [Line Items]
Amortized cost	7,000	8,217
Collateral Pledged | Real estate
Financing Receivable, Nonaccrual [Line Items]
Amortized cost	$ 6,308	$ 7,283