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Loans (Textual) (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
Loans
Tenants
BaordOfDirectors
Segment
Dec. 31, 2014
Mar. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Allowance for Credit Losses, Acquired with Deteriorated Credit Quality $ 0us-gaap_FinancingReceivableAllowanceForCreditLossesAcquiredWithDeterioratedCreditQuality $ 500,000us-gaap_FinancingReceivableAllowanceForCreditLossesAcquiredWithDeterioratedCreditQuality $ 500,000us-gaap_FinancingReceivableAllowanceForCreditLossesAcquiredWithDeterioratedCreditQuality
Loans (Textual) [Abstract]      
Number of portfolio segment 2chfc_NumberOfPortfolioSegment    
Number of classes of loans 7chfc_NumberOfClassesOfLoans    
Number of minimum tenants under lease of non-owner occupied commercial real estate 1chfc_MinimumNumberOfTenantsUnderLeaseOfRealEstate    
Number of members of the board of directors in loan committee 8chfc_NumberOfMembersOfBoardOfDirectorsInLoanCommittee    
Minimum due period of loans consider in a nonperforming status 90 days    
Total nonaccrual TDR loans 37,300,000chfc_ModifiedLoansNotReportedAsTdrIncludedInNonaccrualLoans 37,200,000chfc_ModifiedLoansNotReportedAsTdrIncludedInNonaccrualLoans 44,400,000chfc_ModifiedLoansNotReportedAsTdrIncludedInNonaccrualLoans
Difference between recorded investment and unpaid principal balance of loan 29,700,000chfc_DifferenceBetweenRecordedInvestmentAndUnpaidPrincipalBalanceOfLoan 30,600,000chfc_DifferenceBetweenRecordedInvestmentAndUnpaidPrincipalBalanceOfLoan 21,700,000chfc_DifferenceBetweenRecordedInvestmentAndUnpaidPrincipalBalanceOfLoan
Confirmed losses (partial charge-offs) 14,800,000chfc_ConfirmedLosses 15,400,000chfc_ConfirmedLosses 17,800,000chfc_ConfirmedLosses
Fair value of discount adjustment 14,900,000chfc_FairValueOfDiscountAdjustment 15,200,000chfc_FairValueOfDiscountAdjustment 3,900,000chfc_FairValueOfDiscountAdjustment
Acquired impaired loans 11,200,000chfc_AcquiredImpairedLoans 19,900,000chfc_AcquiredImpairedLoans 11,500,000chfc_AcquiredImpairedLoans
Performing trouble debt restructuring under impaired loans 46,000,000chfc_PerformingTroubleDebtRestructuringUnderImpairedLoans 45,700,000chfc_PerformingTroubleDebtRestructuringUnderImpairedLoans 41,800,000chfc_PerformingTroubleDebtRestructuringUnderImpairedLoans
Financing receivable allowance for acquired loans   500,000chfc_FinancingReceivableAllowanceForAcquiredLoans 500,000chfc_FinancingReceivableAllowanceForAcquiredLoans
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference 0us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldReclassificationsFromNonaccretableDifference    
Residential Mortgage Loans in Process of Foreclosure 2,200,000chfc_ResidentialMortgageLoansinProcessofForeclosure    
Commercial Loan Portfolio [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Allowance for Credit Losses, Acquired with Deteriorated Credit Quality 0us-gaap_FinancingReceivableAllowanceForCreditLossesAcquiredWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 0us-gaap_FinancingReceivableAllowanceForCreditLossesAcquiredWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 0us-gaap_FinancingReceivableAllowanceForCreditLossesAcquiredWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Loans (Textual) [Abstract]      
Minimum value of loan requires executive and senior officer approval 1,500,000chfc_MinimumValueOfLoanRequiresExecutiveAndSeniorOfficerApproval
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		    
Consumer Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Allowance for Credit Losses, Acquired with Deteriorated Credit Quality 0us-gaap_FinancingReceivableAllowanceForCreditLossesAcquiredWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember		 500,000us-gaap_FinancingReceivableAllowanceForCreditLossesAcquiredWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember		 500,000us-gaap_FinancingReceivableAllowanceForCreditLossesAcquiredWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
Loans (Textual) [Abstract]      
Maximum due period of loans consider in performing status 90 days    
Minimum due period of loans consider in a nonperforming status 90 days    
Commercial [Member]      
Loans (Textual) [Abstract]      
Minimum value of loan requires group loan authority approval 1,000,000chfc_MinimumValueOfLoanRequiresGroupLoanAuthorityApproval
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_CommercialLoansMember		    
Maximum value of loan requires executive and senior officer approval 3,500,000chfc_MaximumValueOfLoanRequiresExecutiveAndSeniorOfficerApproval
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_CommercialLoansMember		    
Increase in Minimum Value of Loans Requiring Group Loan Authority Approval 5,000,000chfc_IncreaseinMinimumValueofLoansRequiringGroupLoanAuthorityApproval
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_CommercialLoansMember		    
Real Estate Residential Loans [Member]      
Loans (Textual) [Abstract]      
Period for loan secured under real estate residential security 15 years    
Loan-to-value ratio at the time of origination 80.00%chfc_GeneralMaximumLoanToValueRatio
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_RealEstateResidentialLoansMember		    
Land Development Loans [Member]      
Loans (Textual) [Abstract]      
Maximum period for payment of loan 12 months    
Maximum [Member] | Commercial Loan Portfolio [Member]      
Loans (Textual) [Abstract]      
Maximum value of loan requires group loan authority approval 10,000,000chfc_MaximumValueOfLoanRequiresCorporateLoanCommitteeApproval
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		    
Other loans requiring director loan committee approval depending on risk rating and credit action required 10,000,000chfc_ValueOfLoansDependingOnRiskRatingAndRequiresCreditActionFromDirectorLoanCommittee
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		    
Maximum [Member] | Real Estate Residential Loans [Member]      
Loans (Textual) [Abstract]      
Upper limit of number of family residential properties 4chfc_UpperLimitOfNumberOfFamilyUnitsToBeResidentialProperty
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_RealEstateResidentialLoansMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		    
Minimum [Member] | Commercial Loan Portfolio [Member]      
Loans (Textual) [Abstract]      
Minimum value of loan requires group loan authority approval 1,000,000chfc_MinimumValueOfLoanRequiresCorporateLoanCommitteeApproval
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		    
Minimum value of loans depending on risk rating and requires credit action from board of directors 15,000,000chfc_ValueOfLoansDependingOnRiskRatingAndRequiresCreditActionFromBoardOfDirectors
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		    
Minimum [Member] | Commercial [Member]      
Loans (Textual) [Abstract]      
Minimum value of loans requiring only director loan committee approval $ 10,000,000chfc_ValueOfLoanRequiringOnlyDirectorLoanCommitteeApproval
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_CommercialLoansMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		    
Minimum [Member] | Real Estate Residential Loans [Member]      
Loans (Textual) [Abstract]      
Lower limit of number of family residential properties 1chfc_LowerLimitOfNumberOfFamilyUnitsToBeResidentialProperty
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_RealEstateResidentialLoansMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember