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Loans (Summary of TDRs with a Payment Default During the Period) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Loans
Mar. 31, 2014
Loans
Troubled debt restructurings on financing receivables with defaults payment    
Financing receivable modifications subsequent default number of contract 4chfc_FinancingReceivableModificationsSubsequentDefaultNumberOfContract 3chfc_FinancingReceivableModificationsSubsequentDefaultNumberOfContract
Financing receivable modification subsequent default recorded investment $ 792chfc_FinancingReceivableModificationSubsequentDefaultRecordedInvestment $ 1,774chfc_FinancingReceivableModificationSubsequentDefaultRecordedInvestment
Consumer Portfolio Segment [Member]    
Troubled debt restructurings on financing receivables with defaults payment    
Financing receivable modifications subsequent default number of contract 1chfc_FinancingReceivableModificationsSubsequentDefaultNumberOfContract
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember		 0chfc_FinancingReceivableModificationsSubsequentDefaultNumberOfContract
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
Financing receivable modification subsequent default recorded investment 33chfc_FinancingReceivableModificationSubsequentDefaultRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember		 0chfc_FinancingReceivableModificationSubsequentDefaultRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
Commercial [Member] | Commercial Loan Portfolio [Member]    
Troubled debt restructurings on financing receivables with defaults payment    
Financing receivable modifications subsequent default number of contract 0chfc_FinancingReceivableModificationsSubsequentDefaultNumberOfContract
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 1chfc_FinancingReceivableModificationsSubsequentDefaultNumberOfContract
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Financing receivable modification subsequent default recorded investment 0chfc_FinancingReceivableModificationSubsequentDefaultRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 104chfc_FinancingReceivableModificationSubsequentDefaultRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Real estate commercial [Member] | Commercial Loan Portfolio [Member]    
Troubled debt restructurings on financing receivables with defaults payment    
Financing receivable modifications subsequent default number of contract 3chfc_FinancingReceivableModificationsSubsequentDefaultNumberOfContract
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 2chfc_FinancingReceivableModificationsSubsequentDefaultNumberOfContract
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Financing receivable modification subsequent default recorded investment 759chfc_FinancingReceivableModificationSubsequentDefaultRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 1,670chfc_FinancingReceivableModificationSubsequentDefaultRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Real Estate Construction Loans [Member] | Commercial Loan Portfolio [Member]    
Troubled debt restructurings on financing receivables with defaults payment    
Financing receivable modifications subsequent default number of contract   0chfc_FinancingReceivableModificationsSubsequentDefaultNumberOfContract
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_RealEstateConstructionLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Financing receivable modification subsequent default recorded investment   0chfc_FinancingReceivableModificationSubsequentDefaultRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_RealEstateConstructionLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Land Development Loans [Member] | Commercial Loan Portfolio [Member]    
Troubled debt restructurings on financing receivables with defaults payment    
Financing receivable modifications subsequent default number of contract   0chfc_FinancingReceivableModificationsSubsequentDefaultNumberOfContract
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_LandDevelopmentLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Financing receivable modification subsequent default recorded investment   0chfc_FinancingReceivableModificationSubsequentDefaultRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_LandDevelopmentLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Subtotal-commercial loan portfolio [Member] | Commercial Loan Portfolio [Member]    
Troubled debt restructurings on financing receivables with defaults payment    
Financing receivable modifications subsequent default number of contract 3chfc_FinancingReceivableModificationsSubsequentDefaultNumberOfContract
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_SubCommercialLoanPortfolioMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 3chfc_FinancingReceivableModificationsSubsequentDefaultNumberOfContract
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_SubCommercialLoanPortfolioMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Financing receivable modification subsequent default recorded investment $ 759chfc_FinancingReceivableModificationSubsequentDefaultRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_SubCommercialLoanPortfolioMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 $ 1,774chfc_FinancingReceivableModificationSubsequentDefaultRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_SubCommercialLoanPortfolioMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember