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Goodwill (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Oct. 31, 2014
Dec. 07, 2012
Branches
Goodwill [Line Items]        
Goodwill $ 180,128,000us-gaap_Goodwill $ 120,164,000us-gaap_Goodwill    
Northwestern Bancorp [Member]        
Goodwill [Line Items]        
Goodwill     59,964,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= chfc_NorthwesternBancorpMember		  
Independent Bank [Member]        
Goodwill [Line Items]        
Goodwill       6,800,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= chfc_IndependentBankMember
Number of branches acquired (branches)       21chfc_NumberOfBranchesAcquired
/ us-gaap_BusinessAcquisitionAxis
= chfc_IndependentBankMember
Goodwill expected to be tax deductible       $ 5,900,000us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount
/ us-gaap_BusinessAcquisitionAxis
= chfc_IndependentBankMember