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Balance Sheet Offsetting - Financial Instruments Derivative Assets Liabilities and Resell Agreements Net of Amount Not Offset (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] |  |
Net Amount Recognized, Derivatives, Financial Assets | $ 28,161 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral | $ 29,921 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
Gross Amounts Not Offset, Financial Instruments, Total Derivatives, Financial Assets | (19,223)us-gaap_DerivativeCollateralObligationToReturnSecurities | (20,436)us-gaap_DerivativeCollateralObligationToReturnSecurities
Gross Amount Not Offset Collateral, Derivatives, Financial Assets | (7,443)us-gaap_DerivativeCollateralObligationToReturnCash | (6,035)us-gaap_DerivativeCollateralObligationToReturnCash
Net Amount, Derivatives, Financial Assets | 1,495 us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral | 3,450 us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral
Net Amount Recognized, Resell agreements | 9,642 us-gaap_SecuritiesBorrowedNotSubjectToMasterNettingArrangement | 9,642 us-gaap_SecuritiesBorrowedNotSubjectToMasterNettingArrangement
Gross Amounts Not Offset Financial Instruments, Resell Agreements | 0 us-gaap_SecuritiesPurchasedUnderAgreementsToResellCollateralObligationToReturnSecurities | 0 us-gaap_SecuritiesPurchasedUnderAgreementsToResellCollateralObligationToReturnSecurities
Gross Amounts Not Offset Collateral, Resell Agreements, Financial Assets | (9,642)us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnCash | (9,642)us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnCash
Net Amount, Financial Assets, Resell Agreements | 0 us-gaap_SecuritiesBorrowedAmountOffsetAgainstCollateral | 0 us-gaap_SecuritiesBorrowedAmountOffsetAgainstCollateral
Net Amount Recognized, Total Financial Assets | 37,803 cfr_FinancialAssetsDerivativesAndRepurchaseAgreementsNet | 39,563 cfr_FinancialAssetsDerivativesAndRepurchaseAgreementsNet
Gross Amounts Not Offset Collateral, Financial Assets | (17,085)cfr_FinancialAssetsDerivativeAndResellAgreementsCollateralAmountNotOffset | (15,677)cfr_FinancialAssetsDerivativeAndResellAgreementsCollateralAmountNotOffset
Net Amount, Financial Assets | 1,495 cfr_FinancialAssetsDerivativeAssetsAndResellAgreementsNetOfAmountNotOffset | 3,450 cfr_FinancialAssetsDerivativeAssetsAndResellAgreementsNetOfAmountNotOffset
Net Amount Recognized, Derivatives, Financial Liabilities | 55,894 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral | 47,898 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
Gross Amounts Not Offset Financial Instruments, Total Derivatives, Financial Liabilities | (19,223)us-gaap_DerivativeCollateralRightToReclaimSecurities | (20,436)us-gaap_DerivativeCollateralRightToReclaimSecurities
Gross Amounts Not Offset Collateral, Derivatives, Financial Liabilities | (35,308)us-gaap_DerivativeCollateralRightToReclaimCash | (26,307)us-gaap_DerivativeCollateralRightToReclaimCash
Net Amount, Derivatives, Financial Liabilities | 1,363 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral | 1,155 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral
Net Amount Recognized, Repurchase Agreements, Financial Liabilities | 593,107 us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseNotSubjectToMasterNettingArrangement | 791,119 us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseNotSubjectToMasterNettingArrangement
Gross Amounts Not Offset Financial Instruments, Repurchase Agreements, Financial Liabilities | 0 us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimSecurities | 0 us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimSecurities
Gross Amounts Not Offset Collateral, Repurchase Agreements, Financial Liabilities | (593,107)us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimCash | (791,119)us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimCash
Net Amount, Repurchase Agreements, Financial Liabilities | 0 us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAmountOffsetAgainstCollateral | 0 us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAmountOffsetAgainstCollateral
Net Amount Recognized, Financial Liabilities | 649,001 cfr_FinancialLiabilitiesDerivativesAndRepurchaseAgreementsNet | 839,017 cfr_FinancialLiabilitiesDerivativesAndRepurchaseAgreementsNet
Gross Amounts Not Offset Collateral, Financial Liabilities | (628,415)cfr_FinancialLiabilitiesDerivativeAndRepurchaseAgreementsCollateralAmountNotOffset | (817,426)cfr_FinancialLiabilitiesDerivativeAndRepurchaseAgreementsCollateralAmountNotOffset
Net Amount, Financial Liabilities | 1,363 cfr_FinancialInstrumentsDerivativeLiabilitiesAndRepurchaseAgreementsNetOfAmountNotOffset | 1,155 cfr_FinancialInstrumentsDerivativeLiabilitiesAndRepurchaseAgreementsNetOfAmountNotOffset
Counterparty A [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Net Amount Recognized, Derivatives, Financial Assets | 695 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = cfr_CounterpartyaMember | 627 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = cfr_CounterpartyaMember
Gross Amounts Not Offset, Financial Instruments, Total Derivatives, Financial Assets | (695)us-gaap_DerivativeCollateralObligationToReturnSecurities / us-gaap_CounterpartyNameAxis = cfr_CounterpartyaMember | (627)us-gaap_DerivativeCollateralObligationToReturnSecurities / us-gaap_CounterpartyNameAxis = cfr_CounterpartyaMember
Gross Amount Not Offset Collateral, Derivatives, Financial Assets | 0 us-gaap_DerivativeCollateralObligationToReturnCash / us-gaap_CounterpartyNameAxis = cfr_CounterpartyaMember | 0 us-gaap_DerivativeCollateralObligationToReturnCash / us-gaap_CounterpartyNameAxis = cfr_CounterpartyaMember
Net Amount, Derivatives, Financial Assets | 0 us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = cfr_CounterpartyaMember | 0 us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = cfr_CounterpartyaMember
Net Amount Recognized, Derivatives, Financial Liabilities | 20,440 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = cfr_CounterpartyaMember | 18,653 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = cfr_CounterpartyaMember
Gross Amounts Not Offset Financial Instruments, Total Derivatives, Financial Liabilities | (695)us-gaap_DerivativeCollateralRightToReclaimSecurities / us-gaap_CounterpartyNameAxis = cfr_CounterpartyaMember | (627)us-gaap_DerivativeCollateralRightToReclaimSecurities / us-gaap_CounterpartyNameAxis = cfr_CounterpartyaMember
Gross Amounts Not Offset Collateral, Derivatives, Financial Liabilities | (19,121)us-gaap_DerivativeCollateralRightToReclaimCash / us-gaap_CounterpartyNameAxis = cfr_CounterpartyaMember | (17,626)us-gaap_DerivativeCollateralRightToReclaimCash / us-gaap_CounterpartyNameAxis = cfr_CounterpartyaMember
Net Amount, Derivatives, Financial Liabilities | 624 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = cfr_CounterpartyaMember | 400 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = cfr_CounterpartyaMember
Counterparty B [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Net Amount Recognized, Derivatives, Financial Assets | 18,651 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = cfr_CounterpartybMember | 17,308 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = cfr_CounterpartybMember
Gross Amounts Not Offset, Financial Instruments, Total Derivatives, Financial Assets | (10,671)us-gaap_DerivativeCollateralObligationToReturnSecurities / us-gaap_CounterpartyNameAxis = cfr_CounterpartybMember | (9,506)us-gaap_DerivativeCollateralObligationToReturnSecurities / us-gaap_CounterpartyNameAxis = cfr_CounterpartybMember
Gross Amount Not Offset Collateral, Derivatives, Financial Assets | (6,496)us-gaap_DerivativeCollateralObligationToReturnCash / us-gaap_CounterpartyNameAxis = cfr_CounterpartybMember | (4,925)us-gaap_DerivativeCollateralObligationToReturnCash / us-gaap_CounterpartyNameAxis = cfr_CounterpartybMember
Net Amount, Derivatives, Financial Assets | 1,484 us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = cfr_CounterpartybMember | 2,877 us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = cfr_CounterpartybMember
Net Amount Recognized, Derivatives, Financial Liabilities | 10,671 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = cfr_CounterpartybMember | 9,506 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = cfr_CounterpartybMember
Gross Amounts Not Offset Financial Instruments, Total Derivatives, Financial Liabilities | (10,671)us-gaap_DerivativeCollateralRightToReclaimSecurities / us-gaap_CounterpartyNameAxis = cfr_CounterpartybMember | (9,506)us-gaap_DerivativeCollateralRightToReclaimSecurities / us-gaap_CounterpartyNameAxis = cfr_CounterpartybMember
Gross Amounts Not Offset Collateral, Derivatives, Financial Liabilities | 0 us-gaap_DerivativeCollateralRightToReclaimCash / us-gaap_CounterpartyNameAxis = cfr_CounterpartybMember | 0 us-gaap_DerivativeCollateralRightToReclaimCash / us-gaap_CounterpartyNameAxis = cfr_CounterpartybMember
Net Amount, Derivatives, Financial Liabilities | 0 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = cfr_CounterpartybMember | 0 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = cfr_CounterpartybMember
Counterparty C [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Net Amount Recognized, Derivatives, Financial Assets | 5,903 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = cfr_CounterpartycMember | 7,991 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = cfr_CounterpartycMember
Gross Amounts Not Offset, Financial Instruments, Total Derivatives, Financial Assets | (5,903)us-gaap_DerivativeCollateralObligationToReturnSecurities / us-gaap_CounterpartyNameAxis = cfr_CounterpartycMember | (7,539)us-gaap_DerivativeCollateralObligationToReturnSecurities / us-gaap_CounterpartyNameAxis = cfr_CounterpartycMember
Gross Amount Not Offset Collateral, Derivatives, Financial Assets | 0 us-gaap_DerivativeCollateralObligationToReturnCash / us-gaap_CounterpartyNameAxis = cfr_CounterpartycMember | 0 us-gaap_DerivativeCollateralObligationToReturnCash / us-gaap_CounterpartyNameAxis = cfr_CounterpartycMember
Net Amount, Derivatives, Financial Assets | 0 us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = cfr_CounterpartycMember | 452 us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = cfr_CounterpartycMember
Net Amount Recognized, Derivatives, Financial Liabilities | 6,998 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = cfr_CounterpartycMember | 7,539 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = cfr_CounterpartycMember
Gross Amounts Not Offset Financial Instruments, Total Derivatives, Financial Liabilities | (5,903)us-gaap_DerivativeCollateralRightToReclaimSecurities / us-gaap_CounterpartyNameAxis = cfr_CounterpartycMember | (7,539)us-gaap_DerivativeCollateralRightToReclaimSecurities / us-gaap_CounterpartyNameAxis = cfr_CounterpartycMember
Gross Amounts Not Offset Collateral, Derivatives, Financial Liabilities | (1,095)us-gaap_DerivativeCollateralRightToReclaimCash / us-gaap_CounterpartyNameAxis = cfr_CounterpartycMember | 0 us-gaap_DerivativeCollateralRightToReclaimCash / us-gaap_CounterpartyNameAxis = cfr_CounterpartycMember
Net Amount, Derivatives, Financial Liabilities | 0 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = cfr_CounterpartycMember | 0 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = cfr_CounterpartycMember
Other Counterparties [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Net Amount Recognized, Derivatives, Financial Assets | 2,912 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = cfr_OtherCounterpartiesMember | 3,995 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = cfr_OtherCounterpartiesMember
Gross Amounts Not Offset, Financial Instruments, Total Derivatives, Financial Assets | (1,954)us-gaap_DerivativeCollateralObligationToReturnSecurities / us-gaap_CounterpartyNameAxis = cfr_OtherCounterpartiesMember | (2,764)us-gaap_DerivativeCollateralObligationToReturnSecurities / us-gaap_CounterpartyNameAxis = cfr_OtherCounterpartiesMember
Gross Amount Not Offset Collateral, Derivatives, Financial Assets | (947)us-gaap_DerivativeCollateralObligationToReturnCash / us-gaap_CounterpartyNameAxis = cfr_OtherCounterpartiesMember | (1,110)us-gaap_DerivativeCollateralObligationToReturnCash / us-gaap_CounterpartyNameAxis = cfr_OtherCounterpartiesMember
Net Amount, Derivatives, Financial Assets | 11 us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = cfr_OtherCounterpartiesMember | 121 us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = cfr_OtherCounterpartiesMember
Net Amount Recognized, Derivatives, Financial Liabilities | 17,785 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = cfr_OtherCounterpartiesMember | 12,200 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = cfr_OtherCounterpartiesMember
Gross Amounts Not Offset Financial Instruments, Total Derivatives, Financial Liabilities | (1,954)us-gaap_DerivativeCollateralRightToReclaimSecurities / us-gaap_CounterpartyNameAxis = cfr_OtherCounterpartiesMember | (2,764)us-gaap_DerivativeCollateralRightToReclaimSecurities / us-gaap_CounterpartyNameAxis = cfr_OtherCounterpartiesMember
Gross Amounts Not Offset Collateral, Derivatives, Financial Liabilities | (15,092)us-gaap_DerivativeCollateralRightToReclaimCash / us-gaap_CounterpartyNameAxis = cfr_OtherCounterpartiesMember | (8,681)us-gaap_DerivativeCollateralRightToReclaimCash / us-gaap_CounterpartyNameAxis = cfr_OtherCounterpartiesMember
Net Amount, Derivatives, Financial Liabilities | $ 739 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = cfr_OtherCounterpartiesMember | $ 755 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = cfr_OtherCounterpartiesMember

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- Definition Financial Assets Derivative And Resell Agreements Collateral Amount Not Offset + References No definition available. + Details
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- Definition Financial Assets Derivative Assets And Resell Agreements Net Of Amount Not Offset + References No definition available. + Details
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- Definition Financial Instruments Derivative Liabilities And Repurchase Agreements Net Of Amount Not Offset + References No definition available. + Details
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- Definition Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets, securities purchased under agreements to resell and securities borrowed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226016-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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- Definition Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226016-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56946850&loc=d3e41678-113959 + Details
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