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v2.4.1.9

Balance Sheet Offsetting - Financial Instruments Eligible for Offset Consolidated Balance Sheet (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Gross Amount Recognized, Derivatives, Financial Assets | $ 28,161 us-gaap_DerivativeFairValueOfDerivativeAsset | $ 29,921 us-gaap_DerivativeFairValueOfDerivativeAsset
Gross Amount Offset, Derivatives, Financial assets | 0 cfr_DerivativeAssetsGrossOffset | 0 cfr_DerivativeAssetsGrossOffset
Net Amount Recognized, Derivatives, Financial assets | 28,161 us-gaap_DerivativeAssets | 29,921 us-gaap_DerivativeAssets
Gross Amount Recognized, Resell agreements, Financial assets | 9,642 us-gaap_SecuritiesPurchasedUnderAgreementsToResellGross | 9,642 us-gaap_SecuritiesPurchasedUnderAgreementsToResellGross
Gross Amount Offset, Resell agreements, Financial assets | 0 cfr_ResellAgreementGrossOffset | 0 cfr_ResellAgreementGrossOffset
Net Amount Recognized, Resell agreements, Financial assets | 9,642 us-gaap_ResellAgreementsPeriodEndAmountsExcludingEffectsOfAgreementsReportedNetByCounterparty | 9,642 us-gaap_ResellAgreementsPeriodEndAmountsExcludingEffectsOfAgreementsReportedNetByCounterparty
Gross Amount Recognized, Financial assets | 37,803 cfr_FinancialAssetsGross | 39,563 cfr_FinancialAssetsGross
Gross Amount Offset, Financial assets | 0 cfr_FinancialAssetsGrossOffset | 0 cfr_FinancialAssetsGrossOffset
Net Amount Recognized, Financial assets | 37,803 cfr_FinancialAssetsDerivativesAndResellAgreementsNet | 39,563 cfr_FinancialAssetsDerivativesAndResellAgreementsNet
Gross Amount Recognized, Derivatives, Financial Liabilities | 55,894 us-gaap_DerivativeFairValueOfDerivativeLiability | 47,898 us-gaap_DerivativeFairValueOfDerivativeLiability
Gross Amount Offset, Derivatives, Financial liabilities | 0 cfr_DerivativeLiabilitiesGrossOffset | 0 cfr_DerivativeLiabilitiesGrossOffset
Net Amount Recognized, Derivatives, Financial liabilities | 55,894 us-gaap_DerivativeLiabilities | 47,898 us-gaap_DerivativeLiabilities
Gross Amount Recognized, Repurchase agreements, Financial liabilities | 593,107 us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross | 791,119 us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross
Gross Amount Offset, Repurchase agreements, Financial liabilities | 0 cfr_RepurchaseAgreementsLiabilitiesGrossOffset | 0 cfr_RepurchaseAgreementsLiabilitiesGrossOffset
Net Amount Recognized, Repurchase agreements, Financial liabilities | 593,107 us-gaap_AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability | 791,119 us-gaap_AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability
Gross Amount Recognized, Financial liabilities | 649,001 cfr_FinancialInstrumentsLiabilitiesGross | 839,017 cfr_FinancialInstrumentsLiabilitiesGross
Gross Amount Offset, Financial liabilities | 0 cfr_FinancialInstrumentsLiabilitiesGrossOffset | 0 cfr_FinancialInstrumentsLiabilitiesGrossOffset
Net Amount Recognized, Financial Liabilities | 649,001 cfr_FinancialLiabilitiesDerivativesAndRepurchaseAgreementsNet | 839,017 cfr_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 | 1,193 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_FinancialInstrumentAxis = cfr_LoanLeaseInterestRateSwapsAndCapsMember | 2,191 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_FinancialInstrumentAxis = cfr_LoanLeaseInterestRateSwapsAndCapsMember
Gross Amount Offset, Derivatives, Financial assets | 0 cfr_DerivativeAssetsGrossOffset / us-gaap_FinancialInstrumentAxis = cfr_LoanLeaseInterestRateSwapsAndCapsMember | 0 cfr_DerivativeAssetsGrossOffset / us-gaap_FinancialInstrumentAxis = cfr_LoanLeaseInterestRateSwapsAndCapsMember
Net Amount Recognized, Derivatives, Financial assets | 1,193 us-gaap_DerivativeAssets / us-gaap_FinancialInstrumentAxis = cfr_LoanLeaseInterestRateSwapsAndCapsMember | 2,191 us-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 | 26,626 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_FinancialInstrumentAxis = cfr_CommoditySwapsAndOptionsMember | 27,064 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_FinancialInstrumentAxis = cfr_CommoditySwapsAndOptionsMember
Gross Amount Offset, Derivatives, Financial assets | 0 cfr_DerivativeAssetsGrossOffset / us-gaap_FinancialInstrumentAxis = cfr_CommoditySwapsAndOptionsMember | 0 cfr_DerivativeAssetsGrossOffset / us-gaap_FinancialInstrumentAxis = cfr_CommoditySwapsAndOptionsMember
Net Amount Recognized, Derivatives, Financial assets | 26,626 us-gaap_DerivativeAssets / us-gaap_FinancialInstrumentAxis = cfr_CommoditySwapsAndOptionsMember | 27,064 us-gaap_DerivativeAssets / us-gaap_FinancialInstrumentAxis = cfr_CommoditySwapsAndOptionsMember
Gross Amount Recognized, Derivatives, Financial Liabilities | 5,712 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_FinancialInstrumentAxis = cfr_CommoditySwapsAndOptionsMember | 5,765 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_FinancialInstrumentAxis = cfr_CommoditySwapsAndOptionsMember
Gross Amount Offset, Derivatives, Financial liabilities | 0 cfr_DerivativeLiabilitiesGrossOffset / us-gaap_FinancialInstrumentAxis = cfr_CommoditySwapsAndOptionsMember | 0 cfr_DerivativeLiabilitiesGrossOffset / us-gaap_FinancialInstrumentAxis = cfr_CommoditySwapsAndOptionsMember
Net Amount Recognized, Derivatives, Financial liabilities | 5,712 us-gaap_DerivativeLiabilities / us-gaap_FinancialInstrumentAxis = cfr_CommoditySwapsAndOptionsMember | 5,765 us-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 | 342 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_FinancialInstrumentAxis = cfr_ForeignCurrencyForwardContractsMember | 666 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_FinancialInstrumentAxis = cfr_ForeignCurrencyForwardContractsMember
Gross Amount Offset, Derivatives, Financial assets | 0 cfr_DerivativeAssetsGrossOffset / us-gaap_FinancialInstrumentAxis = cfr_ForeignCurrencyForwardContractsMember | 0 cfr_DerivativeAssetsGrossOffset / us-gaap_FinancialInstrumentAxis = cfr_ForeignCurrencyForwardContractsMember
Net Amount Recognized, Derivatives, Financial assets | 342 us-gaap_DerivativeAssets / us-gaap_FinancialInstrumentAxis = cfr_ForeignCurrencyForwardContractsMember | 666 us-gaap_DerivativeAssets / us-gaap_FinancialInstrumentAxis = cfr_ForeignCurrencyForwardContractsMember
Gross Amount Recognized, Derivatives, Financial Liabilities |  | 2 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_FinancialInstrumentAxis = cfr_ForeignCurrencyForwardContractsMember
Gross Amount Offset, Derivatives, Financial liabilities |  | 0 cfr_DerivativeLiabilitiesGrossOffset / us-gaap_FinancialInstrumentAxis = cfr_ForeignCurrencyForwardContractsMember
Net Amount Recognized, Derivatives, Financial liabilities |  | 2 us-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, Derivatives, Financial Liabilities | 50,182 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_FinancialInstrumentAxis = cfr_LoanLeaseInterestRateSwapsMember | 42,131 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_FinancialInstrumentAxis = cfr_LoanLeaseInterestRateSwapsMember
Gross Amount Offset, Derivatives, Financial liabilities | 0 cfr_DerivativeLiabilitiesGrossOffset / us-gaap_FinancialInstrumentAxis = cfr_LoanLeaseInterestRateSwapsMember | 0 cfr_DerivativeLiabilitiesGrossOffset / us-gaap_FinancialInstrumentAxis = cfr_LoanLeaseInterestRateSwapsMember
Net Amount Recognized, Derivatives, Financial liabilities | $ 50,182 us-gaap_DerivativeLiabilities / us-gaap_FinancialInstrumentAxis = cfr_LoanLeaseInterestRateSwapsMember | $ 42,131 us-gaap_DerivativeLiabilities / us-gaap_FinancialInstrumentAxis = cfr_LoanLeaseInterestRateSwapsMember

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(i)(A)(ii)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition This is the total amount of resale agreements as of the reporting date. This is a gross amount (does not net agreement amounts by counterparty). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(2)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount, before effects of master netting arrangements, of funds outstanding loaned in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313 + Details
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- Definition Amount, before effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Repurchase Agreement Accounted for as a Collateralized Borrowing -URI http://asc.fasb.org/extlink&oid=49203159 + Details
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