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Cash and Cash Equivalents - Additional Information (Details) - USD ($) | Mar. 31, 2022 | Dec. 31, 2021
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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