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Commitments, Contingencies, and Guarantees - Additional Information (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Dec. 06, 2019 | Dec. 31, 2021 | Dec. 31, 2020
Class Settlement | Settled Litigation |  |  |
Representations and Warranties [Line Items] |  |  |
Litigation settlement amount | $ 8.0 |  |
Litigation settlement, amount awarded from other party | $ 2.0 |  | $ 8.0
Standby Letters of Credit |  |  |
Representations and Warranties [Line Items] |  |  |
Assets secured for standby letters of credit |  | $ 103.0 |
Standby and Commercial Letters of Credit | Minimum [Member] |  |  |
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 |  | 14 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 Contingencies and Guarantees. + References No definition available. + Details
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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
- Definition Amount awarded from other party in judgment or settlement of litigation. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementAmountAwardedFromOtherParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount awarded to other party in judgment or settlement of litigation. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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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
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