Bank segment (HEI only) - Allowance for Loan Commitments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Allowance for loan commitments:
Beginning balance	$ 4,900	$ 4,300	$ 1,741
Provision	(500)	600	1,000
Ending balance	4,400	4,900	4,300	$ 1,741
Accounting standards update, extensible enumeration				Accounting Standards Update 2016-13 [Member]
Impact of adoption of ASU No. 2016-13
Allowance for loan commitments:
Beginning balance			1,559
Ending balance				$ 1,559
Real estate | Home equity  line of credit
Allowance for loan commitments:
Beginning balance	400	300	392
Provision	0	100	0
Ending balance	400	400	300	392
Real estate | Home equity  line of credit | Impact of adoption of ASU No. 2016-13
Allowance for loan commitments:
Beginning balance			(92)
Ending balance				(92)
Real estate | Commercial construction
Allowance for loan commitments:
Beginning balance	3,700	3,000	931
Provision	(1,100)	700	324
Ending balance	2,600	3,700	3,000	931
Real estate | Commercial construction | Impact of adoption of ASU No. 2016-13
Allowance for loan commitments:
Beginning balance			1,745
Ending balance				1,745
Commercial
Allowance for loan commitments:
Beginning balance	800	1,000	418
Provision	600	(200)	676
Ending balance	$ 1,400	$ 800	1,000	418
Commercial | Impact of adoption of ASU No. 2016-13
Allowance for loan commitments:
Beginning balance			$ (94)
Ending balance				$ (94)