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Securities Available for Sale (Details) (USD $)
3 Months Ended 6 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Sep. 30, 2014
Proceeds from maturities, prepayments and calls of available-for-sale securities     $ 6,774,050us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities $ 9,860,000us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities  
Proceeds from sales of investment securities available for sale     14,024,153us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities 0us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities  
Available-for-sale securities, gross realized gains     2,507us-gaap_AvailableForSaleSecuritiesGrossRealizedGains    
Available-for-sale securities, gross realized losses     29,716us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses    
Available-for-sale securities pledged as collateral 80,338,521us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral   80,338,521us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral   101,679,874us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral
Gross unrealized losses (685,716)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax   (685,716)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax   (2,195,173)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Amortized Cost 182,124,600us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis   182,124,600us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis    
Other than temporary impairment, credit losses recognized in earnings, credit losses on debt securities held 380,000us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld   380,000us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld    
Other than temporary impairment, credit losses recognized in earnings, additions, additional credit losses 0us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses 0us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses 0us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses 0us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses  
Collateralized mortgage obligations: private-label mortgage securities          
Gross unrealized losses (138,000)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= chfn_PrivateLabelMortgageSecuritiesMember
  (138,000)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= chfn_PrivateLabelMortgageSecuritiesMember
   
Amortized Cost 6,600,000us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= chfn_PrivateLabelMortgageSecuritiesMember
  6,600,000us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= chfn_PrivateLabelMortgageSecuritiesMember
   
Available-for-sale securities          
Proceeds from maturities, prepayments and calls of available-for-sale securities     $ 6,774,050us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities
/ chfn_MaturedSecuritiesAxis
= us-gaap_AvailableforsaleSecuritiesMember
$ 9,860,000us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities
/ chfn_MaturedSecuritiesAxis
= us-gaap_AvailableforsaleSecuritiesMember