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Loans (Summary of Loans) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Summary of loans under portfolio    
Commercial loan $ 3,084,024us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial $ 2,518,826us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
Consumer loan 2,604,206us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer 2,128,795us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer
Total loans 5,688,230us-gaap_LoansAndLeasesReceivableGrossCarryingAmount 4,647,621us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Commercial [Member]    
Summary of loans under portfolio    
Commercial loan 1,354,881us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_CommercialLoansMember		 1,176,307us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_CommercialLoansMember
Real estate commercial [Member]    
Summary of loans under portfolio    
Commercial loan 1,557,648us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_RealEstateCommercialLoansMember		 1,232,658us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_RealEstateCommercialLoansMember
Real estate construction [Member]    
Summary of loans under portfolio    
Commercial loan 152,745us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_RealEstateConstructionLoansMember		 89,795us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_RealEstateConstructionLoansMember
Land development [Member]    
Summary of loans under portfolio    
Commercial loan 18,750us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_LandDevelopmentLoansMember		 20,066us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_LandDevelopmentLoansMember
Real estate residential [Member]    
Summary of loans under portfolio    
Consumer loan 1,110,390us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_RealEstateResidentialLoansMember		 960,423us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_RealEstateResidentialLoansMember
Consumer installment [Member]    
Summary of loans under portfolio    
Consumer loan 829,570us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_ConsumerInstallmentLoansMember		 644,769us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_ConsumerInstallmentLoansMember
Home equity [Member]    
Summary of loans under portfolio    
Consumer loan $ 664,246us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_HomeEquityLoansMember		 $ 523,603us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_HomeEquityLoansMember