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Bank segment (HEI only) - Allowance for loan commitments (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)
Credit risk profile based on payment activity for loans
Beginning Balance	$ 1,741
Provision	1,000
Ending Balance	4,300
Impact of ASU No. 2016-13
Credit risk profile based on payment activity for loans
Beginning Balance	1,559
Real estate | Home equity  line of credit
Credit risk profile based on payment activity for loans
Beginning Balance	392
Provision	0
Ending Balance	300
Real estate | Home equity  line of credit | Impact of ASU No. 2016-13
Credit risk profile based on payment activity for loans
Beginning Balance	(92)
Real estate | Commercial construction
Credit risk profile based on payment activity for loans
Beginning Balance	931
Provision	324
Ending Balance	3,000
Real estate | Commercial construction | Impact of ASU No. 2016-13
Credit risk profile based on payment activity for loans
Beginning Balance	1,745
Commercial
Credit risk profile based on payment activity for loans
Beginning Balance	418
Provision	676
Ending Balance	1,000
Commercial | Impact of ASU No. 2016-13
Credit risk profile based on payment activity for loans
Beginning Balance	$ (94)

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Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121611286&loc=d3e11927-110247

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82919202-210446

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Amount of expense (reversal of expense) for expected credit loss for off-balance sheet credit exposure. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447

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