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Deposits - Additional Information (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Deposits [Abstract] |  |
Total time deposits | $ 1,000,089 | $ 1,662,063
Government entity deposits | 1,200,000 | 1,500,000
Total time deposits100,000 or more | $ 757,964 | $ 1,400,000

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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
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Namespace Prefix: | boh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=116652737&loc=d3e64164-112818 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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- Definition Amount of time deposit liabilities, including certificates of deposit, in denominations of $100,000 or more. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher SEC -Name Industry Guide -Number 3 -Section V -Paragraph D-E + Details
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