Business Segments - Additional Information (Details)	12 Months Ended
Dec. 31, 2022
Segment Reporting [Abstract]
Federal and state effective tax rate used for segment reporting	26.00%

The combined Federal and State Effective Tax Rate Used for Segment Reporting purposes.

No definition available.

Name:	boh_FederalAndStateEffectiveTaxRateUsedForSegmentReporting
Namespace Prefix:	boh_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration