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Commitments and Contingencies - Credit Commitments (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Credit Commitments [Line Items]
Credit Commitments	$ 3,654,756	$ 3,746,414
Unfunded Commitments to Extend Credit
Credit Commitments [Line Items]
Credit Commitments	3,547,254	3,592,872
Standby Letters of Credit
Credit Commitments [Line Items]
Credit Commitments	86,534	129,512
Commercial Letters of Credit
Credit Commitments [Line Items]
Credit Commitments	$ 20,968	$ 24,030

X

- Definition

Credit Commitments.

+ References

No definition available.

+ Details

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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

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

X

- Details

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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: