Significant Accounting Policies (Federal Home Loan Bank Advances) (Details)	Dec. 31, 2014
Accounting Policies [Abstract]
Percentage of FHLB advances secured by first lien real estate residential loans	145.00%

Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Percentage Secured by First Lien Real Estate Residential Loans

No definition available.

Name:	chfc_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresPercentageSecuredByFirstLienRealEstateResidentialLoans
Namespace Prefix:	chfc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant