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Accumulated Other Comprehensive Loss (Details Textual) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accumulated Other Comprehensive Loss (Textual) [Abstract]      
Net unrealized gains (losses) on investment securities-available-for-sale, tax expense (benefit) $ (113)chfc_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentTaxExpense $ (1,335)chfc_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentTaxExpense $ 2,301chfc_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentTaxExpense
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax Benefit $ 17,362chfc_AccumulatedOtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTaxExpense $ 9,714chfc_AccumulatedOtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTaxExpense $ 19,058chfc_AccumulatedOtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTaxExpense