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Fair Value of Assets and Liabilities (Financial instruments not recorded at FV on recurring basis) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Financial Instruments - Assets    
Held-to-Maturity Securities $ 4,378,007us-gaap_HeldToMaturitySecuritiesFairValue $ 4,504,495us-gaap_HeldToMaturitySecuritiesFairValue
Carrying Amount    
Financial Instruments - Assets    
Held-to-Maturity Securities 4,306,353us-gaap_HeldToMaturitySecuritiesFairValue
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Loans 6,825,344us-gaap_LoansReceivableFairValueDisclosure
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Financial Instruments - Liabilities    
Time Deposits 1,308,932boh_FairValueTimeDeposits
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Securities Sold Under Agreements to Repurchase 672,329us-gaap_SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseFairValueDisclosure
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Long-Term Debt 163,005boh_LongTermDebtExcludingCapitalLeaseObligationsFairValue
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Fair Value    
Financial Instruments - Assets    
Held-to-Maturity Securities 4,378,007us-gaap_HeldToMaturitySecuritiesFairValue
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Loans 7,373,867us-gaap_LoansReceivableFairValueDisclosure
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Financial Instruments - Liabilities    
Time Deposits 1,312,619boh_FairValueTimeDeposits
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Securities Sold Under Agreements to Repurchase 744,649us-gaap_SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseFairValueDisclosure
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Long-Term Debt 164,269boh_LongTermDebtExcludingCapitalLeaseObligationsFairValue
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Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial Instruments - Assets    
Held-to-Maturity Securities 523,372us-gaap_HeldToMaturitySecuritiesFairValue
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Loans 0us-gaap_LoansReceivableFairValueDisclosure
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Financial Instruments - Liabilities    
Time Deposits 0boh_FairValueTimeDeposits
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Securities Sold Under Agreements to Repurchase 0us-gaap_SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseFairValueDisclosure
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Long-Term Debt 0boh_LongTermDebtExcludingCapitalLeaseObligationsFairValue
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Fair Value | Significant Other Observable Inputs (Level 2)    
Financial Instruments - Assets    
Held-to-Maturity Securities 3,854,635us-gaap_HeldToMaturitySecuritiesFairValue
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Loans 0us-gaap_LoansReceivableFairValueDisclosure
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Financial Instruments - Liabilities    
Time Deposits 1,312,619boh_FairValueTimeDeposits
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Securities Sold Under Agreements to Repurchase 744,649us-gaap_SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseFairValueDisclosure
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Long-Term Debt 164,269boh_LongTermDebtExcludingCapitalLeaseObligationsFairValue
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Fair Value | Significant Other Unobservable Inputs (Level 3)    
Financial Instruments - Assets    
Held-to-Maturity Securities 0us-gaap_HeldToMaturitySecuritiesFairValue
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Loans 7,373,867us-gaap_LoansReceivableFairValueDisclosure
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Financial Instruments - Liabilities    
Time Deposits 0boh_FairValueTimeDeposits
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Securities Sold Under Agreements to Repurchase 0us-gaap_SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseFairValueDisclosure
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Long-Term Debt $ 0boh_LongTermDebtExcludingCapitalLeaseObligationsFairValue
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