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Loans and Leases and the Allowance for Credit Losses - Schedule of Aging Analysis by Class of Loan and Lease Portfolio (Parenthetical) (Details) | 3 Months Ended
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Mar. 31, 2022
Loans And Leases And Allowance For Loan And Lease Losses [Abstract] |
Number of days non-accrual loans and leases are not past due | 30 days

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- Definition Represents the number of days that the nonaccrual loans that are not past due. + References No definition available. + Details
Name: | boh_FinancingReceivableRecordedInvestmentsNonaccrualStatusCurrentNumberOfDaysNotPastDue
Namespace Prefix: | boh_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Loans and Leases and Allowance for Loan and Lease Losses. + References No definition available. + Details
Name: | boh_LoansAndLeasesAndAllowanceForLoanAndLeaseLossesAbstract
Namespace Prefix: | boh_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration