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Commitments, Contingencies, and Guarantees - Narrative (Details) (Residential Mortgage, USD $)
 3 Months Ended
Mar. 31, 2015
Loan
Residential Mortgage
  
Representations and Warranties [Line Items]  
Continuing Involvement with Transferred Financial Assets, Principal Amount Outstanding $ 2,700,000,000us-gaap_ContinuingInvolvementWithTransferredFinancialAssetsPrincipalAmountOutstanding
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
Number of Mortgage Loans Repurchased 0boh_NumberOfMortgageLoansRepurchased
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
Number of Mortgage Loans Repurchased, Pending 1boh_NumberofMortgageLoansRepurchasedPending
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
Pending Repurchase Mortgage Loans, Unpaid Principal Balance $ 300,000boh_PendingRepurchaseMortgageLoansUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
Number of Mortgage Loans Repurchased due to Loan Servicing Activities, Pending 0boh_NumberofMortgageLoansRepurchasedduetoLoanServicingActivitiesPending
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
Current Residential Mortgage Loans Serviced for Third Parties as Percentage of Total 99.00%boh_CurrentResidentialMortgageLoansServicedForThirdPartiesAsPercentageOfTotal
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember