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Intangible Assets (Textual) (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Core deposit intangible assets [Member]      
Estimated Future Amortization Expense, Fiscal Year Maturity [Abstract]      
2015 $ 2,400,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
   
2016 2,900,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
   
2017 2,600,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
   
2018 2,500,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
   
2019 2,400,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
   
2020 and thereafter 7,200,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
   
Mortgage servicing rights [Member]      
Intangible Assets (Textual) [Abstract]      
Impairment valuation allowance $ 200,000us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= chfc_MortgageServicingRightsMember
$ 200,000us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= chfc_MortgageServicingRightsMember
$ 0us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= chfc_MortgageServicingRightsMember