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Balance Sheet Offsetting - Financial Instruments Eligible for Offset Consolidated Balance Sheet (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Gross Amount Recognized, Derivatives, Financial Assets	$ 29,921cfr_DerivativeAssetsGross	$ 16,265cfr_DerivativeAssetsGross
Gross Amount Offset, Derivatives, Financial Assets	0cfr_DerivativeAssetsGrossOffset	0cfr_DerivativeAssetsGrossOffset
Net Amount Recognized, Derivative, Financial Assets	29,921us-gaap_DerivativeAssets	16,265us-gaap_DerivativeAssets
Gross Amount Recognized, Resell Agreements, Financial Assets	9,642cfr_ResellAgreementsGross	7,898cfr_ResellAgreementsGross
Gross Amount Offset, Resell Agreements, Financial Assets	0cfr_ResellAgreementGrossOffset	0cfr_ResellAgreementGrossOffset
Net Amount Recognized, Resell Agreements, Financial Assets	9,642us-gaap_ResellAgreementsPeriodEndAmountsExcludingEffectsOfAgreementsReportedNetByCounterparty	7,898us-gaap_ResellAgreementsPeriodEndAmountsExcludingEffectsOfAgreementsReportedNetByCounterparty
Gross Amount Recognized, Financial Assets	39,563cfr_FinancialAssetsGross	24,163cfr_FinancialAssetsGross
Gross Amount Offset, Financial Assets	0cfr_FinancialAssetsGrossOffset	0cfr_FinancialAssetsGrossOffset
Net Amount Recognized, Financial Assets	39,563cfr_FinancialAssetsDerivativesAndResellAgreementsNet	24,163cfr_FinancialAssetsDerivativesAndResellAgreementsNet
Gross Amount Recognized, Derivative, Financial Liabilities	47,898cfr_DerivativeLiabilitiesGross	42,603cfr_DerivativeLiabilitiesGross
Gross Amount Offset, Derivative, Financial Liabilities	0cfr_DerivativeLiabilitiesGrossOffset	0cfr_DerivativeLiabilitiesGrossOffset
Net Amount Recognized, Derivative, Financial Liabilities	47,898us-gaap_DerivativeLiabilities	42,603us-gaap_DerivativeLiabilities
Gross Amount Recognized, Repurchase Agreements, Financial Liabilities	791,119cfr_RepurchaseAgreementsLiabilitiesGross	668,053cfr_RepurchaseAgreementsLiabilitiesGross
Gross Amount Offset, Repurchase Agreements, Financial Liabilities	0cfr_RepurchaseAgreementsLiabilitiesGrossOffset	0cfr_RepurchaseAgreementsLiabilitiesGrossOffset
Net Amount Recognized, Repurchase Agreements, Financial Liabilities	791,119us-gaap_AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability	668,053us-gaap_AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability
Gross Amount Recognized, Financial Liabilities	839,017cfr_FinancialInstrumentsLiabilitiesGross	710,656cfr_FinancialInstrumentsLiabilitiesGross
Gross Amount Offset, Financial Liabilities	0cfr_FinancialInstrumentsLiabilitiesGrossOffset	0cfr_FinancialInstrumentsLiabilitiesGrossOffset
Net Amount Recognized, Financial Liabilities	839,017cfr_FinancialLiabilitiesDerivativesAndRepurchaseAgreementsNet	710,656cfr_FinancialLiabilitiesDerivativesAndRepurchaseAgreementsNet
Loan Lease Interest Rate Swaps And Caps [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Gross Amount Recognized, Derivatives, Financial Assets	2,191cfr_DerivativeAssetsGross / us-gaap_FinancialInstrumentAxis = cfr_LoanLeaseInterestRateSwapsAndCapsMember	12,268cfr_DerivativeAssetsGross / us-gaap_FinancialInstrumentAxis = cfr_LoanLeaseInterestRateSwapsAndCapsMember
Gross Amount Offset, Derivatives, Financial Assets	0cfr_DerivativeAssetsGrossOffset / us-gaap_FinancialInstrumentAxis = cfr_LoanLeaseInterestRateSwapsAndCapsMember	0cfr_DerivativeAssetsGrossOffset / us-gaap_FinancialInstrumentAxis = cfr_LoanLeaseInterestRateSwapsAndCapsMember
Net Amount Recognized, Derivative, Financial Assets	2,191us-gaap_DerivativeAssets / us-gaap_FinancialInstrumentAxis = cfr_LoanLeaseInterestRateSwapsAndCapsMember	12,268us-gaap_DerivativeAssets / us-gaap_FinancialInstrumentAxis = cfr_LoanLeaseInterestRateSwapsAndCapsMember
Commodity Swaps And Options [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Gross Amount Recognized, Derivatives, Financial Assets	27,064cfr_DerivativeAssetsGross / us-gaap_FinancialInstrumentAxis = cfr_CommoditySwapsAndOptionsMember	3,907cfr_DerivativeAssetsGross / us-gaap_FinancialInstrumentAxis = cfr_CommoditySwapsAndOptionsMember
Gross Amount Offset, Derivatives, Financial Assets	0cfr_DerivativeAssetsGrossOffset / us-gaap_FinancialInstrumentAxis = cfr_CommoditySwapsAndOptionsMember	0cfr_DerivativeAssetsGrossOffset / us-gaap_FinancialInstrumentAxis = cfr_CommoditySwapsAndOptionsMember
Net Amount Recognized, Derivative, Financial Assets	27,064us-gaap_DerivativeAssets / us-gaap_FinancialInstrumentAxis = cfr_CommoditySwapsAndOptionsMember	3,907us-gaap_DerivativeAssets / us-gaap_FinancialInstrumentAxis = cfr_CommoditySwapsAndOptionsMember
Gross Amount Recognized, Derivative, Financial Liabilities	5,765cfr_DerivativeLiabilitiesGross / us-gaap_FinancialInstrumentAxis = cfr_CommoditySwapsAndOptionsMember	5,916cfr_DerivativeLiabilitiesGross / us-gaap_FinancialInstrumentAxis = cfr_CommoditySwapsAndOptionsMember
Gross Amount Offset, Derivative, Financial Liabilities	0cfr_DerivativeLiabilitiesGrossOffset / us-gaap_FinancialInstrumentAxis = cfr_CommoditySwapsAndOptionsMember	0cfr_DerivativeLiabilitiesGrossOffset / us-gaap_FinancialInstrumentAxis = cfr_CommoditySwapsAndOptionsMember
Net Amount Recognized, Derivative, Financial Liabilities	5,765us-gaap_DerivativeLiabilities / us-gaap_FinancialInstrumentAxis = cfr_CommoditySwapsAndOptionsMember	5,916us-gaap_DerivativeLiabilities / us-gaap_FinancialInstrumentAxis = cfr_CommoditySwapsAndOptionsMember
Foreign Currency Forward Contracts [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Gross Amount Recognized, Derivatives, Financial Assets	666cfr_DerivativeAssetsGross / us-gaap_FinancialInstrumentAxis = cfr_ForeignCurrencyForwardContractsMember	90cfr_DerivativeAssetsGross / us-gaap_FinancialInstrumentAxis = cfr_ForeignCurrencyForwardContractsMember
Gross Amount Offset, Derivatives, Financial Assets	0cfr_DerivativeAssetsGrossOffset / us-gaap_FinancialInstrumentAxis = cfr_ForeignCurrencyForwardContractsMember	0cfr_DerivativeAssetsGrossOffset / us-gaap_FinancialInstrumentAxis = cfr_ForeignCurrencyForwardContractsMember
Net Amount Recognized, Derivative, Financial Assets	666us-gaap_DerivativeAssets / us-gaap_FinancialInstrumentAxis = cfr_ForeignCurrencyForwardContractsMember	90us-gaap_DerivativeAssets / us-gaap_FinancialInstrumentAxis = cfr_ForeignCurrencyForwardContractsMember
Gross Amount Recognized, Derivative, Financial Liabilities	2cfr_DerivativeLiabilitiesGross / us-gaap_FinancialInstrumentAxis = cfr_ForeignCurrencyForwardContractsMember	27cfr_DerivativeLiabilitiesGross / us-gaap_FinancialInstrumentAxis = cfr_ForeignCurrencyForwardContractsMember
Gross Amount Offset, Derivative, Financial Liabilities	0cfr_DerivativeLiabilitiesGrossOffset / us-gaap_FinancialInstrumentAxis = cfr_ForeignCurrencyForwardContractsMember	0cfr_DerivativeLiabilitiesGrossOffset / us-gaap_FinancialInstrumentAxis = cfr_ForeignCurrencyForwardContractsMember
Net Amount Recognized, Derivative, Financial Liabilities	2us-gaap_DerivativeLiabilities / us-gaap_FinancialInstrumentAxis = cfr_ForeignCurrencyForwardContractsMember	27us-gaap_DerivativeLiabilities / us-gaap_FinancialInstrumentAxis = cfr_ForeignCurrencyForwardContractsMember
Loan Lease Interest Rate Swaps [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Gross Amount Recognized, Derivative, Financial Liabilities	42,131cfr_DerivativeLiabilitiesGross / us-gaap_FinancialInstrumentAxis = cfr_LoanLeaseInterestRateSwapsMember	36,660cfr_DerivativeLiabilitiesGross / us-gaap_FinancialInstrumentAxis = cfr_LoanLeaseInterestRateSwapsMember
Gross Amount Offset, Derivative, Financial Liabilities	0cfr_DerivativeLiabilitiesGrossOffset / us-gaap_FinancialInstrumentAxis = cfr_LoanLeaseInterestRateSwapsMember	0cfr_DerivativeLiabilitiesGrossOffset / us-gaap_FinancialInstrumentAxis = cfr_LoanLeaseInterestRateSwapsMember
Net Amount Recognized, Derivative, Financial Liabilities	$ 42,131us-gaap_DerivativeLiabilities / us-gaap_FinancialInstrumentAxis = cfr_LoanLeaseInterestRateSwapsMember	$ 36,660us-gaap_DerivativeLiabilities / us-gaap_FinancialInstrumentAxis = cfr_LoanLeaseInterestRateSwapsMember

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Amount to be repaid to the counterparty to the repurchase agreement when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under the repurchase agreement exceeds 10 percent of total assets.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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