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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)	6 Months Ended
	Jun. 30, 2023
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

X

- 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

X

- 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