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Other Comprehensive Income (Loss) (Component of Other Comprehensive Income (Loss)) (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Equity [Abstract]      
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Before Tax Amount $ 103,044us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax $ (115,245)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax $ 33,412us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Before Tax Amount (35,441)us-gaap_OtherComprehensiveIncomeReclassificationAdjustmentForHeldToMaturityTransferredToAvailableForSaleSecuritiesBeforeTax (35,682)us-gaap_OtherComprehensiveIncomeReclassificationAdjustmentForHeldToMaturityTransferredToAvailableForSaleSecuritiesBeforeTax (657)us-gaap_OtherComprehensiveIncomeReclassificationAdjustmentForHeldToMaturityTransferredToAvailableForSaleSecuritiesBeforeTax
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Before Tax Amount (38)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax (1,176)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax (4,314)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax
Total securities available for sale and transferred securities 67,565us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax (152,103)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax 28,441us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax
Defined-benefit post-retirement benefit plans, Change in the net actuarial gain/loss, Before Tax Amount (34,837)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax 35,293us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax (9,405)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax
Derivatives, Change in the accumulated gain/loss on effective cash flow hedge derivatives, Before Tax Amount 0us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax (49)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax (783)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax
Derivatives, Reclassification adjustments for (gains) losses included in net income, Interest rate swaps on variable-rate loans, Before Tax Amount (30,604)cfr_OtherComprehensiveIncomeReclassificationAdjustmentForDerivativeInterestRateSwapsOnVariableRateLoansBeforeTax (37,380)cfr_OtherComprehensiveIncomeReclassificationAdjustmentForDerivativeInterestRateSwapsOnVariableRateLoansBeforeTax (37,380)cfr_OtherComprehensiveIncomeReclassificationAdjustmentForDerivativeInterestRateSwapsOnVariableRateLoansBeforeTax
Derivatives, Reclassification adjustments for (gains) losses included in net income, Interest rate swap on junior subordinated deferrable interest debentures, Before Tax Amount 0cfr_OtherComprehensiveIncomeReclassificationAdjustmentForDerivativeInterestRateSwapsOnJuniorSubordinatedDeferrableInterestDebenturesBeforeTax 4,064cfr_OtherComprehensiveIncomeReclassificationAdjustmentForDerivativeInterestRateSwapsOnJuniorSubordinatedDeferrableInterestDebenturesBeforeTax 4,224cfr_OtherComprehensiveIncomeReclassificationAdjustmentForDerivativeInterestRateSwapsOnJuniorSubordinatedDeferrableInterestDebenturesBeforeTax
Total derivatives (30,604)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax (33,365)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax (33,939)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax
Other comprehensive income (loss), before tax 2,124us-gaap_OtherComprehensiveIncomeLossBeforeTax (150,175)us-gaap_OtherComprehensiveIncomeLossBeforeTax (14,903)us-gaap_OtherComprehensiveIncomeLossBeforeTax
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Tax Expense (Benefit) 36,065us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax (40,335)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax 11,694us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax
Securities available for sale and transferred securities, change in net unrealized gain on securities transfers to held-to-maturity, tax expense benefit (12,404)us-gaap_OtherComprehensiveIncomeReclassificationAdjustmentForHeldToMaturityTransferredToAvailableForSaleSecuritiesTax (12,489)us-gaap_OtherComprehensiveIncomeReclassificationAdjustmentForHeldToMaturityTransferredToAvailableForSaleSecuritiesTax (230)us-gaap_OtherComprehensiveIncomeReclassificationAdjustmentForHeldToMaturityTransferredToAvailableForSaleSecuritiesTax
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Tax Expense (Benefit) (13)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax (412)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax (1,510)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax
Total securities available for sale and transferred securities, Tax Expense (Benefit) 23,648us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax (53,236)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax 9,954us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax
Defined-benefit post-retirement benefit plans, Change in the net actuarial gain/loss, Tax Expense (Benefit) (12,193)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax 12,353us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax (3,292)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax
Derivatives, Change in the accumulated gain/loss on effective cash flow hedge derivatives, Tax Expense (Benefit)   (17)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax (274)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax
Derivatives, Reclassification adjustments for (gains) losses included in net income, Interest rate swaps on variable-rate loans, Tax Expense (Benefit) (10,711)cfr_OtherComprehensiveIncomeReclassificationAdjustmentForDerivativeInterestRateSwapsOnVariableRateLoansTaxExpenseBenefit (13,083)cfr_OtherComprehensiveIncomeReclassificationAdjustmentForDerivativeInterestRateSwapsOnVariableRateLoansTaxExpenseBenefit (13,083)cfr_OtherComprehensiveIncomeReclassificationAdjustmentForDerivativeInterestRateSwapsOnVariableRateLoansTaxExpenseBenefit
Derivatives, Reclassification adjustments for (gains) losses included in net income, Interest rate swap on junior subordinated deferrable interest debentures, Tax Expense (Benefit)   1,422cfr_OtherComprehensiveIncomeReclassificationAdjustmentForDerivativeInterestRateSwapsOnJuniorSubordinatedDeferralInterestDebenturesTaxExpenseBenefit 1,478cfr_OtherComprehensiveIncomeReclassificationAdjustmentForDerivativeInterestRateSwapsOnJuniorSubordinatedDeferralInterestDebenturesTaxExpenseBenefit
Derivatives, Total derivatives, Tax Expense, (Benefit)   (11,678)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax (11,879)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax
Total other comprehensive income, Tax Expense (Benefit) 744us-gaap_OtherComprehensiveIncomeLossTax (52,561)us-gaap_OtherComprehensiveIncomeLossTax (5,217)us-gaap_OtherComprehensiveIncomeLossTax
Securities available for sale and transferred securities, change in net unrealized gain/loss during the period, net of tax 66,979us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax (74,910)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax 21,718us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Securities available for sale and transferred securities, change in net unrealized gain on securities transfers to held-to-maturity, net of tax (23,037)us-gaap_OtherComprehensiveIncomeLossTransfersFromHeldToMaturityToAvailableForSaleSecuritiesNetOfTax (23,193)us-gaap_OtherComprehensiveIncomeLossTransfersFromHeldToMaturityToAvailableForSaleSecuritiesNetOfTax (427)us-gaap_OtherComprehensiveIncomeLossTransfersFromHeldToMaturityToAvailableForSaleSecuritiesNetOfTax
Securities available for sale and securities transferred, reclassification adjustment for net (gains) losses included in net income, net of tax (25)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax (764)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax (2,804)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
Total securities available for sale and transferred securities, net of tax 43,917us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax (98,867)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax 18,487us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Defined-benefit post-retirement plans, Change in the net actuarial gain/loss, net of tax (22,644)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax 22,940us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax (6,113)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Derivatives, Change in the accumulated gain/loss on effective cash flow hedge derivatives, net of tax   (32)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax (509)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Derivatives, reclassification adjustment for (gains) losses included in net income, interest rate swaps on variable-rate loans, net of tax (19,893)cfr_OtherComprehensiveIncomeReclassificationAdjustmentForDerivativeInterestRateSwapsOnVariableRateLoansNetOfTax (24,297)cfr_OtherComprehensiveIncomeReclassificationAdjustmentForDerivativeInterestRateSwapsOnVariableRateLoansNetOfTax (24,297)cfr_OtherComprehensiveIncomeReclassificationAdjustmentForDerivativeInterestRateSwapsOnVariableRateLoansNetOfTax
Derivatives, reclassification adjustment for (gains) losses included in net income, interest rate swap on junior subordinated deferrable interest debentures, net of tax   2,642cfr_OtherComprehensiveIncomeReclassificationAdjustmentForDerivativeInterestRateSwapsOnJuniorSubordinatedDeferrableInterestDebenturesNetOfTax 2,746cfr_OtherComprehensiveIncomeReclassificationAdjustmentForDerivativeInterestRateSwapsOnJuniorSubordinatedDeferrableInterestDebenturesNetOfTax
Derivatives, Total derivatives, net of tax   (21,687)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax (22,060)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
Other comprehensive income (loss), net of tax $ 1,380us-gaap_OtherComprehensiveIncomeLossNetOfTax $ (97,614)us-gaap_OtherComprehensiveIncomeLossNetOfTax $ (9,686)us-gaap_OtherComprehensiveIncomeLossNetOfTax