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Deposits - Additional Information (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Deposits [Abstract] |  |
Total time deposits | $ 3,059,575 | $ 3,057,302
Government entity deposits | 1,900,000 | 2,000,000
Time deposits over $250,000 | $ 1,920,101 | $ 2,100,000

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- Definition The aggregate amount of deposits of governmental entities, which require collateralization by acceptable investment securities of the company. + References No definition available. + Details
Name: | boh_DepositsGovernmentalEntities
Namespace Prefix: | boh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Time deposits over $250,000. + References No definition available. + Details
Name: | boh_TimeDepositsOver250000
Namespace Prefix: | boh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_DepositsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of time deposit liabilities, including certificates of deposit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 405 -Topic 942 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478353/942-405-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(12)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 + Details
Name: | us-gaap_TimeDeposits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant