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Employee Benefits (Details) (USD $)
0 Months Ended 6 Months Ended
Apr. 08, 2013
Mar. 31, 2015
Mar. 31, 2014
Sep. 30, 2014
Shares granted and outstanding   1,622,116us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber    
Conversion of stock, shares issued 1.2471us-gaap_ConversionOfStockSharesIssued1      
Intrinsic value of all stock options exercisable   $ 1,164,619us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1    
Stock option expense   165,497us-gaap_StockOptionPlanExpense 143,662us-gaap_StockOptionPlanExpense  
Retirement age   65 years    
2002 Stock Option Plan        
Purchase price of common stock (percent)   100.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent
/ us-gaap_PlanNameAxis
= chfn_A2002StockOptionPlanMember
   
2013 Equity Incentive Plan        
Purchase price of common stock (percent)   100.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent
/ us-gaap_PlanNameAxis
= chfn_A2013EquityIncentivePlanMember
   
Stock Options        
Shares issued or retired upon exercise of the option granted under the plan   1,316us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
   
Shares granted and outstanding   1,622,116us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
  1,627,739us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Intrinsic value of stock options outstanding and exercisable   $ 2,583,761us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
   
Options exercisable, end of period   584,252us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
   
Stock Options | 2002 Stock Option Plan        
Expected life at date of grant (years)   10 years    
Number of shares authorized for grant   882,876us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= chfn_A2002StockOptionPlanMember
   
Shares issued or retired upon exercise of the option granted under the plan   77,777us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= chfn_A2002StockOptionPlanMember
   
Shares granted and outstanding   650,436us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= chfn_A2002StockOptionPlanMember
   
Number of shares available for grant   0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= chfn_A2002StockOptionPlanMember
   
Number of shares vested   389,917us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= chfn_A2002StockOptionPlanMember
   
Stock Options | 2013 Equity Incentive Plan        
Expected life at date of grant (years)   10 years    
Number of shares authorized for grant   1,428,943us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= chfn_A2013EquityIncentivePlanMember
   
Shares granted and outstanding   971,680us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= chfn_A2013EquityIncentivePlanMember
   
Number of shares available for grant   457,263us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= chfn_A2013EquityIncentivePlanMember
   
Number of shares vested during period   194,335us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= chfn_A2013EquityIncentivePlanMember
   
Stock Options | Minimum | 2002 Stock Option Plan        
Vesting period (years)   4 years    
Stock Options | Minimum | 2013 Equity Incentive Plan        
Vesting period (years)   1 year    
Stock Options | Maximum | 2002 Stock Option Plan        
Vesting period (years)   5 years    
Stock Options | Maximum | 2013 Equity Incentive Plan        
Vesting period (years)   5 years    
Restricted Stock | 2001 Recognition and Retention Plan        
Number of shares authorized for grant   9,355us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= chfn_TwoThousandOneRecognitionandRetentionPlanMember
   
Number of shares vested   5,610us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= chfn_TwoThousandOneRecognitionandRetentionPlanMember
   
Restricted Stock | 2013 Equity Incentive Plan        
Number of shares authorized for grant   571,577us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= chfn_A2013EquityIncentivePlanMember
   
Shares granted and outstanding   360,092us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= chfn_A2013EquityIncentivePlanMember
   
Number of shares available for grant   211,485us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= chfn_A2013EquityIncentivePlanMember
   
Unvested restricted stock awards - Vested (in Shares)   72,015us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= chfn_A2013EquityIncentivePlanMember