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Investment Securities (Visa Class B restricted Shares) (Details 8) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Net Investment Income [Line Items]    
Gain on sale of investment securities $ 10,231us-gaap_GainLossOnSaleOfSecuritiesNet $ 2,160us-gaap_GainLossOnSaleOfSecuritiesNet
Visa Class B Restricted Securities    
Net Investment Income [Line Items]    
Conversion ratio to Class A shares 1.6483boh_ConversionRatioofConvertibleSecurities
/ us-gaap_InvestmentTypeAxis
= boh_VisaClassBRestrictedSecuritiesMember		  
Gain on sale of investment securities $ 10,100us-gaap_GainLossOnSaleOfSecuritiesNet
/ us-gaap_InvestmentTypeAxis
= boh_VisaClassBRestrictedSecuritiesMember		  
Sale of investment securities, shares 95,000boh_SaleofInvestmentSecuritiesShares
/ us-gaap_InvestmentTypeAxis
= boh_VisaClassBRestrictedSecuritiesMember		  
Equity securities remaining, shares 297,814boh_EquitySecuritiesShares
/ us-gaap_InvestmentTypeAxis
= boh_VisaClassBRestrictedSecuritiesMember		  
Donation of Investment Securities, Shares 4,700boh_DonationofInvestmentSecuritiesShares
/ us-gaap_InvestmentTypeAxis
= boh_VisaClassBRestrictedSecuritiesMember		  
Visa Class A Unrestricted Securities    
Net Investment Income [Line Items]    
Equity securities remaining, shares 490,887boh_EquitySecuritiesShares
/ us-gaap_InvestmentTypeAxis
= boh_VisaClassAUnrestrictedSecuritiesMember