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