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Commitments and Contingencies - Credit Commitments (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Credit Commitments [Line Items] |  |
Credit Commitments | $ 3,654,756 | $ 3,746,414
Unfunded Commitments to Extend Credit |  |
Credit Commitments [Line Items] |  |
Credit Commitments | 3,547,254 | 3,592,872
Standby Letters of Credit |  |
Credit Commitments [Line Items] |  |
Credit Commitments | 86,534 | 129,512
Commercial Letters of Credit |  |
Credit Commitments [Line Items] |  |
Credit Commitments | $ 20,968 | $ 24,030

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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: |