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Employee Benefits (Details) (USD $)
3 Months Ended 12 Months Ended 0 Months Ended
Mar. 31, 2015
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Mar. 31, 2014
Dec. 31, 2014
Jul. 01, 2013
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Employee Stock Ownership Plan        
Percentage of common stock outstanding, held in ESOP   8.00%cway_EmployeeStockOwnershipPlanESOPSharesInESOPPercentage    
Term of loan payable   25 years    
Interest rate (as a percent)   3.25%us-gaap_DebtInstrumentInterestRateDuringPeriod    
Shares held by the ESOP        
Allocated (in shares) 15,837us-gaap_EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares      
Committed to be allocated (in shares) 3,959us-gaap_EmployeeStockOwnershipPlanESOPNumberOfCommittedToBeReleasedShares      
Unallocated (in shares) 376,138us-gaap_EmployeeStockOwnershipPlanESOPNumberOfSuspenseShares      
Total (in shares) 395,934us-gaap_EmployeeStockOwnershipPlanESOPSharesInESOP 395,934us-gaap_EmployeeStockOwnershipPlanESOPSharesInESOP    
Fair value of unallocated shares $ 4,200,000cway_EmployeeStockOwnershipPlanESOPNumberOfSuspenseSharesFairValue      
Compensation expense 44,000us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense   41,000us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense  
Change in Control Severance Plan        
Number of times base salary plus highest bonus will be paid immediately prior to termination of participants 2cway_NumberOfTimesBaseSalaryPlusHighestBonusOfSpecifiedPeriodWillBePaidImmediatelyPriorToTerminationOfParticipants      
Period considered for payment of highest bonus immediately prior to termination of participants in the Severance Plan 2 years      
Deferred compensation SERP        
Deferred Compensation Supplemental Executive Plan        
Assets related to the Plan 984,000cway_DeferredCompensationArrangementWithIndividualRecordedAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cway_DeferredCompensationSerpMember
  989,000cway_DeferredCompensationArrangementWithIndividualRecordedAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cway_DeferredCompensationSerpMember
 
Shares held in the Rabbi Trust (in shares) 8,900us-gaap_CommonStockSharesHeldInEmployeeTrustShares
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cway_DeferredCompensationSerpMember
     
Liability for benefit obligation reported in accrued expenses and other liabilities 984,000us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cway_DeferredCompensationSerpMember
  989,000us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cway_DeferredCompensationSerpMember
 
SERP        
Deferred Compensation Supplemental Executive Plan        
Expense (income) 151,000us-gaap_PensionAndOtherPostretirementBenefitExpense
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
  102,000us-gaap_PensionAndOtherPostretirementBenefitExpense
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
 
Defined Benefit Pension Plan        
Deferred Compensation Supplemental Executive Plan        
Expense (income) $ 5,000us-gaap_PensionAndOtherPostretirementBenefitExpense
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
(6,600)us-gaap_PensionAndOtherPostretirementBenefitExpense
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
   
Executive officers | SERP        
Deferred Compensation Supplemental Executive Plan        
Number of employees with whom the entity entered into agreements       6cway_DefinedBenefitPlanNumberOfEmployeesCovered
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
Executive officers | SERP | Minimum        
Deferred Compensation Supplemental Executive Plan        
Retirement age for SERP       65cway_DefinedBenefitPlanRetirementAge
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
Executive officers | SERP | Maximum        
Deferred Compensation Supplemental Executive Plan        
Retirement age for SERP       67cway_DefinedBenefitPlanRetirementAge
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember