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v3.25.3

Commitments and Contingencies - Additional Information (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2025 USD ($)
Standby Letters of Credit |
Representations and Warranties [Line Items] |
Assets secured for standby letters of credit | $ 77.0
Standby and Commercial Letters of Credit | Minimum |
Representations and Warranties [Line Items] |
Standby and commercial letters of credit remaining term | 1 month
Standby and Commercial Letters of Credit | Maximum |
Representations and Warranties [Line Items] |
Standby and commercial letters of credit remaining term | 12 months

X
- Definition Represents the value of assets secured for the standby letters of credit. + References No definition available. + Details
Name: | boh_AssetsSecuredForStandbyLettersOfCredit
Namespace Prefix: | boh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Commitments and contingencies. + References No definition available. + Details
Name: | boh_CommitmentsAndContingenciesLineItems
Namespace Prefix: | boh_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the remaining term of standby and commercial letters of credit. + References No definition available. + Details
Name: | boh_StandbyAndCommercialLettersOfCreditRemainingTerm
Namespace Prefix: | boh_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_StandbyLettersOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=boh_StandbyAndCommercialLetteresOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |