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Other Intangible Assets (Carrying and Fair Value of MSRs) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Net carrying value, fair value of MSRs and loans Corporation servicing for others        
Total other intangible assets $ 33,080us-gaap_FiniteLivedIntangibleAssetsNet $ 13,424us-gaap_FiniteLivedIntangibleAssetsNet    
Loans serviced for others that have servicing rights capitalized 2,093,140chfc_LoansServicedForOthersThatServicingRightsCapitalized 886,730chfc_LoansServicedForOthersThatServicingRightsCapitalized    
Mortgage servicing rights [Member]        
Net carrying value, fair value of MSRs and loans Corporation servicing for others        
Total other intangible assets 12,217us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= chfc_MortgageServicingRightsMember
3,423us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= chfc_MortgageServicingRightsMember
3,478us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= chfc_MortgageServicingRightsMember
3,593us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= chfc_MortgageServicingRightsMember
Fair value of MSRs 14,979us-gaap_ServicingAssetAtFairValueAmount
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= chfc_MortgageServicingRightsMember
6,878us-gaap_ServicingAssetAtFairValueAmount
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= chfc_MortgageServicingRightsMember
   
Originated Portfolio [Member]        
Net carrying value, fair value of MSRs and loans Corporation servicing for others        
Loans serviced for others that have servicing rights capitalized $ 881,000chfc_LoansServicedForOthersThatServicingRightsCapitalized
/ chfc_LoansservicedforothersAxis
= chfc_OriginatedPortfolioSegmentMember