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Intangible Assets (Detail Textuals) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jun. 30, 2013
Finite-Lived Intangible Assets [Line Items]        
Amortization expense $ 0us-gaap_AmortizationOfIntangibleAssets $ 135,000us-gaap_AmortizationOfIntangibleAssets $ 408,000us-gaap_AmortizationOfIntangibleAssets  
Core Deposit Intangible Asset        
Finite-Lived Intangible Assets [Line Items]        
Gross Carrying Amount       4,800,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
Amortization expense 0us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
135,000us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
408,000us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
 
Mortgage servicing rights (MSRs)        
Finite-Lived Intangible Assets [Line Items]        
Mortgage loans serviced for others 313,900,000hwbk_LoansServicedForOthers
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ServicingContractsMember
322,500,000hwbk_LoansServicedForOthers
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ServicingContractsMember
   
Mortgage loan servicing fees reported as other non-interest income 895,000us-gaap_ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ServicingContractsMember
901,000us-gaap_ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ServicingContractsMember
878,000us-gaap_ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ServicingContractsMember
 
Amortization 0us-gaap_ServicingAssetAtAmortizedValueAmortization1
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ServicingContractsMember
0us-gaap_ServicingAssetAtAmortizedValueAmortization1
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ServicingContractsMember
0us-gaap_ServicingAssetAtAmortizedValueAmortization1
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ServicingContractsMember
 
Mortgage servicing rights (MSRs) | Error adjustment related to amortization method of MSR's        
Finite-Lived Intangible Assets [Line Items]        
Cumulative effect of change in accounting principle as increase to retained earnings 459,890us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleCumulativeEffectOfChangeOnEquityOrNetAssets1
/ us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis
= hwbk_ErrorAdjustmentAmortizationMethodMortgageServicingRightsMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ServicingContractsMember
     
Amortization     $ 538,000us-gaap_ServicingAssetAtAmortizedValueAmortization1
/ us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis
= hwbk_ErrorAdjustmentAmortizationMethodMortgageServicingRightsMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ServicingContractsMember