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Significant Accounting Policies (Loans Acquired in a Business Combination) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Pools
Dec. 31, 2013
Apr. 30, 2010
Oct. 31, 2014
Business Acquisition [Line Items]        
Outstanding contractual principal balance of loans with deteriorated quality of acquired loan portfolio 698,163,000us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality $ 294,697,000us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality    
OAK [Member]        
Business Acquisition [Line Items]        
Outstanding contractual principal balance of loans with deteriorated quality of acquired loan portfolio     105,000,000us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality
/ dei_LegalEntityAxis
= chfc_OakMember
 
Outstanding contractual principal balance of loans without deteriorated quality of acquired loan portfolio     578,000,000chfc_FinancingReceivableAcquiredWithWithoutDeterioratedCreditQuality
/ dei_LegalEntityAxis
= chfc_OakMember
 
Outstanding contractual principal balance of acquired loan portfolio     683,000,000us-gaap_BusinessCombinationAcquiredReceivablesGrossContractualAmount
/ dei_LegalEntityAxis
= chfc_OakMember
 
Number of pools of aggregate acquired loans based upon common risk characteristics 14chfc_NumberOfPoolsOfAggregateAcquiredLoansBasedUponCommonRiskCharacteristics
/ dei_LegalEntityAxis
= chfc_OakMember
     
Northwestern Bancorp [Member]        
Business Acquisition [Line Items]        
Outstanding contractual principal balance of loans with deteriorated quality of acquired loan portfolio       46,000,000us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality
/ dei_LegalEntityAxis
= chfc_NorthwesternBancorpMember
Outstanding contractual principal balance of loans without deteriorated quality of acquired loan portfolio       461,000,000chfc_FinancingReceivableAcquiredWithWithoutDeterioratedCreditQuality
/ dei_LegalEntityAxis
= chfc_NorthwesternBancorpMember
Outstanding contractual principal balance of acquired loan portfolio       $ 507,000,000us-gaap_BusinessCombinationAcquiredReceivablesGrossContractualAmount
/ dei_LegalEntityAxis
= chfc_NorthwesternBancorpMember
Number of pools of aggregate acquired loans based upon common risk characteristics 4chfc_NumberOfPoolsOfAggregateAcquiredLoansBasedUponCommonRiskCharacteristics
/ dei_LegalEntityAxis
= chfc_NorthwesternBancorpMember