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Fair Value Measurements (Financial Assets and Financial Liabilities Measured at Fair Value on Recurring Basis) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value	$ 8,461,254us-gaap_AvailableForSaleSecurities	$ 5,895,436us-gaap_AvailableForSaleSecurities
Trading account securities	15,426us-gaap_TradingSecurities	16,398us-gaap_TradingSecurities
Derivative assets:	29,921us-gaap_DerivativeAssets	16,265us-gaap_DerivativeAssets
Derivative liabilities:	47,898us-gaap_DerivativeLiabilities	42,603us-gaap_DerivativeLiabilities
US Treasury [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value	3,811,252us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_USTreasurySecuritiesMember	2,540,554us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_USTreasurySecuritiesMember
Trading account securities	15,339us-gaap_TradingSecurities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_USTreasurySecuritiesMember	15,389us-gaap_TradingSecurities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_USTreasurySecuritiesMember
US Government agencies/ corporations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value		53,980us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
Residential Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value	1,398,724us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember	1,776,016us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value	3,208,907us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember	1,488,914us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Trading account securities	87us-gaap_TradingSecurities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember	1,009us-gaap_TradingSecurities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value	42,371us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_OtherInvestmentsMember	35,972us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_OtherInvestmentsMember
Interest Rate Swaps, Caps and Floors [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets:	41,101us-gaap_DerivativeAssets / us-gaap_FairValueByMeasurementBasisAxis = cfr_InterestRateSwapsCapsAndFloorsMember	44,694us-gaap_DerivativeAssets / us-gaap_FairValueByMeasurementBasisAxis = cfr_InterestRateSwapsCapsAndFloorsMember
Derivative liabilities:	43,853us-gaap_DerivativeLiabilities / us-gaap_FairValueByMeasurementBasisAxis = cfr_InterestRateSwapsCapsAndFloorsMember	47,542us-gaap_DerivativeLiabilities / us-gaap_FairValueByMeasurementBasisAxis = cfr_InterestRateSwapsCapsAndFloorsMember
Commodity Swaps And Options [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets:	32,829us-gaap_DerivativeAssets / us-gaap_FairValueByMeasurementBasisAxis = cfr_CommoditySwapsAndOptionsMember	10,026us-gaap_DerivativeAssets / us-gaap_FairValueByMeasurementBasisAxis = cfr_CommoditySwapsAndOptionsMember
Derivative liabilities:	32,729us-gaap_DerivativeLiabilities / us-gaap_FairValueByMeasurementBasisAxis = cfr_CommoditySwapsAndOptionsMember	9,712us-gaap_DerivativeLiabilities / us-gaap_FairValueByMeasurementBasisAxis = cfr_CommoditySwapsAndOptionsMember
Foreign Currency Forward Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets:	666us-gaap_DerivativeAssets / us-gaap_FairValueByMeasurementBasisAxis = cfr_ForeignCurrencyForwardContractMember	135us-gaap_DerivativeAssets / us-gaap_FairValueByMeasurementBasisAxis = cfr_ForeignCurrencyForwardContractMember
Derivative liabilities:	617us-gaap_DerivativeLiabilities / us-gaap_FairValueByMeasurementBasisAxis = cfr_ForeignCurrencyForwardContractMember	85us-gaap_DerivativeLiabilities / us-gaap_FairValueByMeasurementBasisAxis = cfr_ForeignCurrencyForwardContractMember
Level 1 [Member] | US Treasury [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value	3,811,252us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_USTreasurySecuritiesMember	2,540,554us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_USTreasurySecuritiesMember
Trading account securities	15,339us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_USTreasurySecuritiesMember	15,389us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_USTreasurySecuritiesMember
Level 1 [Member] | Foreign Currency Forward Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets:	666us-gaap_DerivativeAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementBasisAxis = cfr_ForeignCurrencyForwardContractMember	135us-gaap_DerivativeAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementBasisAxis = cfr_ForeignCurrencyForwardContractMember
Derivative liabilities:	617us-gaap_DerivativeLiabilities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementBasisAxis = cfr_ForeignCurrencyForwardContractMember	85us-gaap_DerivativeLiabilities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementBasisAxis = cfr_ForeignCurrencyForwardContractMember
Level 2 [Member] | US Government agencies/ corporations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value		53,980us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
Level 2 [Member] | Residential Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value	1,398,724us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember	1,776,016us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Level 2 [Member] | States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value	3,208,907us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember	1,488,914us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Trading account securities	87us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember	1,009us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Level 2 [Member] | Other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value	42,371us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_OtherInvestmentsMember	35,972us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_OtherInvestmentsMember
Level 2 [Member] | Interest Rate Swaps, Caps and Floors [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets:	40,931us-gaap_DerivativeAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = cfr_InterestRateSwapsCapsAndFloorsMember	44,520us-gaap_DerivativeAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = cfr_InterestRateSwapsCapsAndFloorsMember
Derivative liabilities:	43,853us-gaap_DerivativeLiabilities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = cfr_InterestRateSwapsCapsAndFloorsMember	47,542us-gaap_DerivativeLiabilities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = cfr_InterestRateSwapsCapsAndFloorsMember
Level 2 [Member] | Commodity Swaps And Options [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets:	32,829us-gaap_DerivativeAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = cfr_CommoditySwapsAndOptionsMember	10,026us-gaap_DerivativeAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = cfr_CommoditySwapsAndOptionsMember
Derivative liabilities:	32,729us-gaap_DerivativeLiabilities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = cfr_CommoditySwapsAndOptionsMember	9,712us-gaap_DerivativeLiabilities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = cfr_CommoditySwapsAndOptionsMember
Level 3 [Member] | Interest Rate Swaps, Caps and Floors [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets:	$ 170us-gaap_DerivativeAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = cfr_InterestRateSwapsCapsAndFloorsMember	$ 174us-gaap_DerivativeAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = cfr_InterestRateSwapsCapsAndFloorsMember

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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