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Commitments and Contingencies - Additional Information (Details) $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($)
Standby Letters of Credit
Representations and Warranties [Line Items]
Assets secured for standby letters of credit	$ 63.5
Standby and Commercial Letters of Credit | Minimum [Member]
Representations and Warranties [Line Items]
Standby and commercial letters of credit remaining term	1 month
Standby and Commercial Letters of Credit | Maximum [Member]
Representations and Warranties [Line Items]
Standby and commercial letters of credit remaining term	24 months

X

- Definition

Represents the value of assets secured for the standby letters of credit.

+ References

No definition available.

+ Details

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Namespace Prefix:	boh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Commitments and contingencies.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the remaining term of standby and commercial letters of credit.

+ References

No definition available.

+ Details

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Namespace Prefix:	boh_
Data Type:	xbrli:durationItemType
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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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