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Restrictions on Cash and Cash and Cash Equivalents - Additional Information (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Cash And Cash Equivalents [Abstract]
Required Minimum Average Cash Reserve Maintained with Federal Reserve Bank	$ 0	$ 0

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- Definition

The required minimum average cash reserve maintained with the Federal Reserve Bank based on the amount of deposits held with the Federal Reserve Bank.

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

Name:	us-gaap_CashAndCashEquivalentsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration