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Cover page - USD ($)
 12 Months Ended
Dec. 31, 2020
Feb. 16, 2021
Jun. 30, 2020
Entity Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2020    
Document Transition Report false    
Entity File Number 1-6887    
Entity Registrant Name BANK OF HAWAII CORP    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 99-0148992    
Entity Address, Address Line One 130 Merchant Street    
Entity Address, City or Town Honolulu    
Entity Address, State or Province HI    
Entity Address, Postal Zip Code 96813    
City Area Code 888    
Local Phone Number 643-3888    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 2,393,046,926
Entity Common Stock, Shares Outstanding   40,134,784  
Entity Central Index Key 0000046195    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
ICFR Auditor Attestation Flag true    
Documents Incorporated by Reference

Portions of the registrant’s definitive proxy statement relating to its 2021 Annual Meeting of Shareholders, are incorporated herein by reference in Part III of this Annual Report on Form 10-K to the extent stated herein.  Such proxy statement will be filed with the Securities and Exchange Commission within 120 days of the registrant’s fiscal year end ended December 31, 2020.

    
NEW YORK STOCK EXCHANGE, INC. [Member]      
Entity Information [Line Items]      
Title of 12(b) Security Common Stock    
Trading Symbol BOH    
Security Exchange Name NYSE