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Commitments, Contingencies, and Guarantees - Credit Commitments (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Credit Commitments [Line Items] |  |
Credit Commitments | $ 3,249,761 | $ 3,136,796
Unfunded Commitments to Extend Credit |  |
Credit Commitments [Line Items] |  |
Credit Commitments | 3,090,969 | 2,982,673
Standby Letters of Credit |  |
Credit Commitments [Line Items] |  |
Credit Commitments | 135,279 | 135,167
Commercial Letters of Credit |  |
Credit Commitments [Line Items] |  |
Credit Commitments | $ 23,513 | $ 18,956

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- Definition Credit Commitments. + 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 The face amount of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. + References No definition available. + Details
Name: | us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CommitmentsToExtendCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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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=us-gaap_LetterOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |