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Federal Home Loan Bank Advances (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule of Federal Home Loan Bank Advances [Line Items]      
FHLB advances additional borrowing capacity $ 360,000,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresMaximumAmountAvailable    
FHLB advance prepayment fee 0chfc_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresPrepaymentPenalties 800,000chfc_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresPrepaymentPenalties 0chfc_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresPrepaymentPenalties
Real Estate Residential Loans [Member]      
Schedule of Federal Home Loan Bank Advances [Line Items]      
Carrying value of FHLB collateral $ 1,040,000,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_RealEstateResidentialLoansMember