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Loans (Summary of TDRs with a Payment Default During the Period) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Loans
Dec. 31, 2013
Loans
Dec. 31, 2012
Loans
Troubled debt restructurings on financing receivables with defaults payment      
Financing receivable modifications subsequent default number of loans 25chfc_FinancingReceivableModificationsSubsequentDefaultNumberOfContract 58chfc_FinancingReceivableModificationsSubsequentDefaultNumberOfContract 42chfc_FinancingReceivableModificationsSubsequentDefaultNumberOfContract
Financing receivable modification subsequent default recorded investment $ 3,496chfc_FinancingReceivableModificationSubsequentDefaultRecordedInvestment $ 10,746chfc_FinancingReceivableModificationSubsequentDefaultRecordedInvestment $ 9,515chfc_FinancingReceivableModificationSubsequentDefaultRecordedInvestment
Commercial [Member] | Commercial Loan Portfolio [Member]      
Troubled debt restructurings on financing receivables with defaults payment      
Financing receivable modifications subsequent default number of loans 7chfc_FinancingReceivableModificationsSubsequentDefaultNumberOfContract
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 23chfc_FinancingReceivableModificationsSubsequentDefaultNumberOfContract
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 10chfc_FinancingReceivableModificationsSubsequentDefaultNumberOfContract
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Financing receivable modification subsequent default recorded investment 885chfc_FinancingReceivableModificationSubsequentDefaultRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 2,745chfc_FinancingReceivableModificationSubsequentDefaultRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 1,692chfc_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 loans 6chfc_FinancingReceivableModificationsSubsequentDefaultNumberOfContract
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 8chfc_FinancingReceivableModificationsSubsequentDefaultNumberOfContract
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 15chfc_FinancingReceivableModificationsSubsequentDefaultNumberOfContract
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Financing receivable modification subsequent default recorded investment 2,352chfc_FinancingReceivableModificationSubsequentDefaultRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 4,278chfc_FinancingReceivableModificationSubsequentDefaultRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 4,993chfc_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 loans 0chfc_FinancingReceivableModificationsSubsequentDefaultNumberOfContract
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_RealEstateConstructionLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 3chfc_FinancingReceivableModificationsSubsequentDefaultNumberOfContract
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_RealEstateConstructionLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 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		 371chfc_FinancingReceivableModificationSubsequentDefaultRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_RealEstateConstructionLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 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 loans 0chfc_FinancingReceivableModificationsSubsequentDefaultNumberOfContract
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_LandDevelopmentLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 2chfc_FinancingReceivableModificationsSubsequentDefaultNumberOfContract
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_LandDevelopmentLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 4chfc_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		 1,526chfc_FinancingReceivableModificationSubsequentDefaultRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_LandDevelopmentLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 1,157chfc_FinancingReceivableModificationSubsequentDefaultRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_LandDevelopmentLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Commercial loan portfolio [Member] | Commercial Loan Portfolio [Member]      
Troubled debt restructurings on financing receivables with defaults payment      
Financing receivable modifications subsequent default number of loans 13chfc_FinancingReceivableModificationsSubsequentDefaultNumberOfContract
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_SubCommercialLoanPortfolioMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 36chfc_FinancingReceivableModificationsSubsequentDefaultNumberOfContract
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_SubCommercialLoanPortfolioMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 29chfc_FinancingReceivableModificationsSubsequentDefaultNumberOfContract
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_SubCommercialLoanPortfolioMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Financing receivable modification subsequent default recorded investment 3,237chfc_FinancingReceivableModificationSubsequentDefaultRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_SubCommercialLoanPortfolioMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 8,920chfc_FinancingReceivableModificationSubsequentDefaultRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_SubCommercialLoanPortfolioMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 7,842chfc_FinancingReceivableModificationSubsequentDefaultRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_SubCommercialLoanPortfolioMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Consumer loan portfolio (real estate residential) [Member] | Consumer Portfolio Segment [Member]      
Troubled debt restructurings on financing receivables with defaults payment      
Financing receivable modifications subsequent default number of loans 12chfc_FinancingReceivableModificationsSubsequentDefaultNumberOfContract
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_ConsumerLoanPortfolioRealEstateResidentialMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember		 22chfc_FinancingReceivableModificationsSubsequentDefaultNumberOfContract
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_ConsumerLoanPortfolioRealEstateResidentialMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember		 13chfc_FinancingReceivableModificationsSubsequentDefaultNumberOfContract
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_ConsumerLoanPortfolioRealEstateResidentialMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
Financing receivable modification subsequent default recorded investment $ 259chfc_FinancingReceivableModificationSubsequentDefaultRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_ConsumerLoanPortfolioRealEstateResidentialMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember		 $ 1,826chfc_FinancingReceivableModificationSubsequentDefaultRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_ConsumerLoanPortfolioRealEstateResidentialMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember		 $ 1,673chfc_FinancingReceivableModificationSubsequentDefaultRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_ConsumerLoanPortfolioRealEstateResidentialMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember