Name:	boh_CurrentResidentialMortgageLoansServicedForThirdPartiesAsPercentageOfTotal
Namespace Prefix:	boh_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Number of Mortgage Loans Repurchased

No definition available.

Name:	boh_NumberOfMortgageLoansRepurchased
Namespace Prefix:	boh_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Number of Mortgage Loans Repurchased, Pending

No definition available.

Name:	boh_NumberofMortgageLoansRepurchasedPending
Namespace Prefix:	boh_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

Number of Mortgage Loans Repurchased due to Loan Servicing Activities

No definition available.

Name:	boh_NumberofMortgageLoansRepurchasedduetoLoanServicingActivities
Namespace Prefix:	boh_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Number of Mortgage Loans Repurchased due to Loan Servicing Activities, Pending

No definition available.

Name:	boh_NumberofMortgageLoansRepurchasedduetoLoanServicingActivitiesPending
Namespace Prefix:	boh_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

Cash Flows between a transferor and a transferee attributable to purchases of previously transferred financial assets (or its underlying collateral) related to a securitization, asset-backed financing arrangement, or similar transfer in which the transferor has continuing involvement with the transferred financial assets underlying the transaction (including, but not limited to, servicing, recourse, and restrictions on transferor's interests in the transferred financial assets).

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph b
-URI http://asc.fasb.org/extlink&oid=64830801&loc=d3e107207-111719

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Principal amount of transferred financial assets in which the transferor has continuing involvement with the assets underlying the transaction. Continuing involvement includes, but is not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=64830801&loc=d3e107314-111719

Name:	us-gaap_ContinuingInvolvementWithTransferredFinancialAssetsPrincipalAmountOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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.

No definition available.