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Business Segments - Additional Information (Details)	9 Months Ended
	Sep. 30, 2025 atm branch
Business segment financial information
Federal and state effective tax rate used for segment reporting	26.00%
Consumer Banking
Business segment financial information
Number of branch locations through which products and services are delivered to customers | branch	51
Number of ATM's through which products and services are delivered to customers | atm	322

X

- Definition

The combined Federal and State Effective Tax Rate Used for Segment Reporting purposes.

+ References

No definition available.

+ Details

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X

- Definition

The number of ATMs through which products and services are delivered to customers.

+ References

No definition available.

+ Details

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

X

- Definition

The number of branch locations through which products and services are delivered to customers.

+ References

No definition available.

+ Details

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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: