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v3.22.4

Business Segments - Additional Information (Details) | 12 Months Ended
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Dec. 31, 2022
Segment Reporting [Abstract] |
Federal and state effective tax rate used for segment reporting | 26.00%

X
- 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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- References No definition available. + Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration