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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 | Dec. 31, 2014 | Dec. 31, 2013
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Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Gross Amount Recognized, Derivatives, Financial Assets | $ 29,921 cfr_DerivativeAssetsGross | $ 16,265 cfr_DerivativeAssetsGross
Gross Amount Offset, Derivatives, Financial Assets | 0 cfr_DerivativeAssetsGrossOffset | 0 cfr_DerivativeAssetsGrossOffset
Net Amount Recognized, Derivative, Financial Assets | 29,921 us-gaap_DerivativeAssets | 16,265 us-gaap_DerivativeAssets
Gross Amount Recognized, Resell Agreements, Financial Assets | 9,642 cfr_ResellAgreementsGross | 7,898 cfr_ResellAgreementsGross
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 | 7,898 us-gaap_ResellAgreementsPeriodEndAmountsExcludingEffectsOfAgreementsReportedNetByCounterparty
Gross Amount Recognized, Financial Assets | 39,563 cfr_FinancialAssetsGross | 24,163 cfr_FinancialAssetsGross
Gross Amount Offset, Financial Assets | 0 cfr_FinancialAssetsGrossOffset | 0 cfr_FinancialAssetsGrossOffset
Net Amount Recognized, Financial Assets | 39,563 cfr_FinancialAssetsDerivativesAndResellAgreementsNet | 24,163 cfr_FinancialAssetsDerivativesAndResellAgreementsNet
Gross Amount Recognized, Derivative, Financial Liabilities | 47,898 cfr_DerivativeLiabilitiesGross | 42,603 cfr_DerivativeLiabilitiesGross
Gross Amount Offset, Derivative, Financial Liabilities | 0 cfr_DerivativeLiabilitiesGrossOffset | 0 cfr_DerivativeLiabilitiesGrossOffset
Net Amount Recognized, Derivative, Financial Liabilities | 47,898 us-gaap_DerivativeLiabilities | 42,603 us-gaap_DerivativeLiabilities
Gross Amount Recognized, Repurchase Agreements, Financial Liabilities | 791,119 cfr_RepurchaseAgreementsLiabilitiesGross | 668,053 cfr_RepurchaseAgreementsLiabilitiesGross
Gross Amount Offset, Repurchase Agreements, Financial Liabilities | 0 cfr_RepurchaseAgreementsLiabilitiesGrossOffset | 0 cfr_RepurchaseAgreementsLiabilitiesGrossOffset
Net Amount Recognized, Repurchase Agreements, Financial Liabilities | 791,119 us-gaap_AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability | 668,053 us-gaap_AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability
Gross Amount Recognized, Financial Liabilities | 839,017 cfr_FinancialInstrumentsLiabilitiesGross | 710,656 cfr_FinancialInstrumentsLiabilitiesGross
Gross Amount Offset, Financial Liabilities | 0 cfr_FinancialInstrumentsLiabilitiesGrossOffset | 0 cfr_FinancialInstrumentsLiabilitiesGrossOffset
Net Amount Recognized, Financial Liabilities | 839,017 cfr_FinancialLiabilitiesDerivativesAndRepurchaseAgreementsNet | 710,656 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 | 2,191 cfr_DerivativeAssetsGross / us-gaap_FinancialInstrumentAxis = cfr_LoanLeaseInterestRateSwapsAndCapsMember | 12,268 cfr_DerivativeAssetsGross / 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, Derivative, Financial Assets | 2,191 us-gaap_DerivativeAssets / us-gaap_FinancialInstrumentAxis = cfr_LoanLeaseInterestRateSwapsAndCapsMember | 12,268 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 | 27,064 cfr_DerivativeAssetsGross / us-gaap_FinancialInstrumentAxis = cfr_CommoditySwapsAndOptionsMember | 3,907 cfr_DerivativeAssetsGross / 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, Derivative, Financial Assets | 27,064 us-gaap_DerivativeAssets / us-gaap_FinancialInstrumentAxis = cfr_CommoditySwapsAndOptionsMember | 3,907 us-gaap_DerivativeAssets / us-gaap_FinancialInstrumentAxis = cfr_CommoditySwapsAndOptionsMember
Gross Amount Recognized, Derivative, Financial Liabilities | 5,765 cfr_DerivativeLiabilitiesGross / us-gaap_FinancialInstrumentAxis = cfr_CommoditySwapsAndOptionsMember | 5,916 cfr_DerivativeLiabilitiesGross / us-gaap_FinancialInstrumentAxis = cfr_CommoditySwapsAndOptionsMember
Gross Amount Offset, Derivative, Financial Liabilities | 0 cfr_DerivativeLiabilitiesGrossOffset / us-gaap_FinancialInstrumentAxis = cfr_CommoditySwapsAndOptionsMember | 0 cfr_DerivativeLiabilitiesGrossOffset / us-gaap_FinancialInstrumentAxis = cfr_CommoditySwapsAndOptionsMember
Net Amount Recognized, Derivative, Financial Liabilities | 5,765 us-gaap_DerivativeLiabilities / us-gaap_FinancialInstrumentAxis = cfr_CommoditySwapsAndOptionsMember | 5,916 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 | 666 cfr_DerivativeAssetsGross / us-gaap_FinancialInstrumentAxis = cfr_ForeignCurrencyForwardContractsMember | 90 cfr_DerivativeAssetsGross / 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, Derivative, Financial Assets | 666 us-gaap_DerivativeAssets / us-gaap_FinancialInstrumentAxis = cfr_ForeignCurrencyForwardContractsMember | 90 us-gaap_DerivativeAssets / us-gaap_FinancialInstrumentAxis = cfr_ForeignCurrencyForwardContractsMember
Gross Amount Recognized, Derivative, Financial Liabilities | 2 cfr_DerivativeLiabilitiesGross / us-gaap_FinancialInstrumentAxis = cfr_ForeignCurrencyForwardContractsMember | 27 cfr_DerivativeLiabilitiesGross / us-gaap_FinancialInstrumentAxis = cfr_ForeignCurrencyForwardContractsMember
Gross Amount Offset, Derivative, Financial Liabilities | 0 cfr_DerivativeLiabilitiesGrossOffset / us-gaap_FinancialInstrumentAxis = cfr_ForeignCurrencyForwardContractsMember | 0 cfr_DerivativeLiabilitiesGrossOffset / us-gaap_FinancialInstrumentAxis = cfr_ForeignCurrencyForwardContractsMember
Net Amount Recognized, Derivative, Financial Liabilities | 2 us-gaap_DerivativeLiabilities / us-gaap_FinancialInstrumentAxis = cfr_ForeignCurrencyForwardContractsMember | 27 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, Derivative, Financial Liabilities | 42,131 cfr_DerivativeLiabilitiesGross / us-gaap_FinancialInstrumentAxis = cfr_LoanLeaseInterestRateSwapsMember | 36,660 cfr_DerivativeLiabilitiesGross / us-gaap_FinancialInstrumentAxis = cfr_LoanLeaseInterestRateSwapsMember
Gross Amount Offset, Derivative, Financial Liabilities | 0 cfr_DerivativeLiabilitiesGrossOffset / us-gaap_FinancialInstrumentAxis = cfr_LoanLeaseInterestRateSwapsMember | 0 cfr_DerivativeLiabilitiesGrossOffset / us-gaap_FinancialInstrumentAxis = cfr_LoanLeaseInterestRateSwapsMember
Net Amount Recognized, Derivative, Financial Liabilities | $ 42,131 us-gaap_DerivativeLiabilities / us-gaap_FinancialInstrumentAxis = cfr_LoanLeaseInterestRateSwapsMember | $ 36,660 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph m -Subparagraph 1 -Article 4 Reference 2: 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 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226008-175313 + Details
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