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Investment Securities (Detail Textuals) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Security
Dec. 31, 2014
Security
Investments Debt And Equity Securities Abstract    
Available for sale securities, restricted $ 4,600,000us-gaap_AvailableForSaleSecuritiesRestricted $ 4,700,000us-gaap_AvailableForSaleSecuritiesRestricted
Available for sale securities, pledged 176,600,000us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged 145,500,000us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged
Number of securities consisted in portfolio 319hwbk_NumberOfSecuritiesInAvailableForSalePortfolio 300hwbk_NumberOfSecuritiesInAvailableForSalePortfolio
Number of securities in loss position 77us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1 74us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
Unrealized loss included in other comprehensive 93,700,000us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities 82,200,000us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities
Loss position for 12 months or longer 47,017,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue 65,249,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
Aggregate unrealized loss included in accumulated other comprehensive income $ 1,000,000us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax $ 1,300,000us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax