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Derivative Financial Instruments - Additional Information (Details) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Interest Rate Swap Agreements
Derivative [Line Items]
Net asset positions, aggregate fair value	$ 148,000,000	$ 114,500,000
Visa Class B Restricted Securities
Derivative [Line Items]
Liability derivatives	$ 0	$ 0

X

- Definition

Derivative Net Asset Position Aggregate Fair Value.

+ References

No definition available.

+ Details

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Namespace Prefix:	boh_
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Balance Type:	debit
Period Type:	instant

X

- Definition

Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as a liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-4B

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480237/815-40-50-5

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- Details

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- Details

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