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Commitments and Contingencies - Credit Commitments (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Credit Commitments [Line Items]
Credit Commitments	$ 3,400,067	$ 3,538,124
Unfunded Commitments to Extend Credit
Credit Commitments [Line Items]
Credit Commitments	3,294,464	3,433,061
Standby Letters of Credit
Credit Commitments [Line Items]
Credit Commitments	89,883	88,512
Commercial Letters of Credit
Credit Commitments [Line Items]
Credit Commitments	$ 15,720	$ 16,551

X

- Definition

Credit Commitments.

+ References

No definition available.

+ Details

Name:	boh_CreditCommitmentsLineItems
Namespace Prefix:	boh_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The face amount of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.

+ References

No definition available.

+ Details

Name:	us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CommitmentsToExtendCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_StandbyLettersOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: