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Business Segments - Additional Information (Details) | 9 Months Ended
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Sep. 30, 2021 branch atm
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 | 54
Number of ATM's through which products and services are delivered to customers | atm | 303

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- Definition The combined Federal and State Effective Tax Rate Used for Segment Reporting purposes. + References No definition available. + Details
Name: | boh_FederalAndStateEffectiveTaxRateUsedForSegmentReporting
Namespace Prefix: | boh_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The number of ATMs through which products and services are delivered to customers. + References No definition available. + Details
Name: | boh_NumberOfATMsThroughWhichProductsAndServicesDeliveredToCustomers
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
Name: | boh_NumberOfBranchLocationsThroughWhichProductsAndServicesDeliveredToCustomers
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
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=boh_ConsumerBankingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |