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Intangible Assets (Carrying and Fair Value of MSRs) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Net carrying value, fair value of MSRs and loans Corporation servicing for others      
Loans serviced for others that have servicing rights capitalized $ 2,062,544chfc_LoansServicedForOthersThatServicingRightsCapitalized $ 2,093,140chfc_LoansServicedForOthersThatServicingRightsCapitalized $ 877,530chfc_LoansServicedForOthersThatServicingRightsCapitalized
Mortgage servicing rights [Member]      
Net carrying value, fair value of MSRs and loans Corporation servicing for others      
Net carrying value of MSRs 11,583chfc_FiniteLivedIntangibleAssetsIncludingCoreDepositMSRAndNonCompeteNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= chfc_MortgageServicingRightsMember		 12,217chfc_FiniteLivedIntangibleAssetsIncludingCoreDepositMSRAndNonCompeteNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= chfc_MortgageServicingRightsMember		 3,316chfc_FiniteLivedIntangibleAssetsIncludingCoreDepositMSRAndNonCompeteNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= chfc_MortgageServicingRightsMember
Fair value of MSRs $ 14,378us-gaap_ServicingAssetAtFairValueAmount
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= chfc_MortgageServicingRightsMember		 $ 14,979us-gaap_ServicingAssetAtFairValueAmount
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= chfc_MortgageServicingRightsMember		 $ 6,706us-gaap_ServicingAssetAtFairValueAmount
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= chfc_MortgageServicingRightsMember