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v3.23.3

Commitments and Contingencies - Additional Information (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2023 USD ($)
Standby Letters of Credit |
Representations and warranties [Line Items] |
Assets secured for standby letters of credit | $ 60.6
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

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- Definition Assets secured for stand by letters of credit. + References No definition available. + Details
Name: | boh_AssetsSecuredForStandByLettersOfCredit
Namespace Prefix: | boh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Definition Stand by and commercial letters of credit remaining term. + References No definition available. + Details
Name: | boh_StandByAndCommercialLettersOfCreditRemainingTerm
Namespace Prefix: | boh_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

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

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

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