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Other Comprehensive Income (Loss) - Component of Other Comprehensive Income (Loss) (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Equity [Abstract]    
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Before Tax Amount $ 34,527us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax $ 21,431us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Before Tax Amount (7,887)us-gaap_OtherComprehensiveIncomeReclassificationAdjustmentForHeldToMaturityTransferredToAvailableForSaleSecuritiesBeforeTax (9,198)us-gaap_OtherComprehensiveIncomeReclassificationAdjustmentForHeldToMaturityTransferredToAvailableForSaleSecuritiesBeforeTax
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Before Tax Amount (228)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax
Total securities available for sale and transferred securities, Before Tax Amount 26,412us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax 12,233us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax
Defined-benefit post-retirement benefit plans, Change in the net actuarial gain/loss, Before Tax Amount 1,749us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax 672us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax
Derivatives, Reclassification adjustments for gains on interest rate swaps on variable-rate loans included in net income, Before Tax Amount 0cfr_OtherComprehensiveIncomeReclassificationAdjustmentForDerivativeInterestRateSwapsOnVariableRateLoansBeforeTax (9,345)cfr_OtherComprehensiveIncomeReclassificationAdjustmentForDerivativeInterestRateSwapsOnVariableRateLoansBeforeTax
Total derivatives, Before Tax Amount 0us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax (9,345)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax
Total other comprehensive income (loss), before tax 28,161us-gaap_OtherComprehensiveIncomeLossBeforeTax 3,560us-gaap_OtherComprehensiveIncomeLossBeforeTax
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Tax Expense (Benefit) 12,084us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax 7,501us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Tax Expense (Benefit) (2,760)us-gaap_OtherComprehensiveIncomeReclassificationAdjustmentForHeldToMaturityTransferredToAvailableForSaleSecuritiesTax (3,219)us-gaap_OtherComprehensiveIncomeReclassificationAdjustmentForHeldToMaturityTransferredToAvailableForSaleSecuritiesTax
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Tax Expense (Benefit) (80)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax
Total securities available for sale and transferred securities, Tax Expense (Benefit) 9,244us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax 4,282us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax
Defined-benefit post-retirement benefit plans, Change in the net actuarial gain/loss, Tax Expense (Benefit) 612us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax 235us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax
Derivatives, Reclassification adjustments for gains on interest rate swaps on variable-rate loans included in net income, Tax Expense (Benefit) 0cfr_OtherComprehensiveIncomeReclassificationAdjustmentForDerivativeInterestRateSwapsOnVariableRateLoansTaxExpenseBenefit (3,271)cfr_OtherComprehensiveIncomeReclassificationAdjustmentForDerivativeInterestRateSwapsOnVariableRateLoansTaxExpenseBenefit
Total derivatives, Tax Expense (Benefit) 0us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax (3,271)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax
Total other comprehensive income (loss), Tax Expense (Benefit) 9,856us-gaap_OtherComprehensiveIncomeLossTax 1,246us-gaap_OtherComprehensiveIncomeLossTax
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Net of Tax 22,443us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax 13,930us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Net of Tax (5,127)us-gaap_OtherComprehensiveIncomeLossTransfersFromHeldToMaturityToAvailableForSaleSecuritiesNetOfTax (5,979)us-gaap_OtherComprehensiveIncomeLossTransfersFromHeldToMaturityToAvailableForSaleSecuritiesNetOfTax
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Net of Tax (148)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
Total securities available for sale and transferred securities, Net of Tax 17,168us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax 7,951us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Defined-benefit post-retirement benefit plans,Change in the net actuarial gain/loss, Net of Tax 1,137us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax 437us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Derivatives, Reclassification adjustments for gains on interest rate swaps on variabl-rate loans included in net income, Net of Tax 0cfr_OtherComprehensiveIncomeReclassificationAdjustmentForDerivativeInterestRateSwapsOnVariableRateLoansNetOfTax (6,074)cfr_OtherComprehensiveIncomeReclassificationAdjustmentForDerivativeInterestRateSwapsOnVariableRateLoansNetOfTax
Total derivatives, Net of Tax 0us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax (6,074)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
Other comprehensive income (loss), net of tax $ 18,305us-gaap_OtherComprehensiveIncomeLossNetOfTax $ 2,314us-gaap_OtherComprehensiveIncomeLossNetOfTax