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Derivative Financial Instruments Derivative Financial Instruments (Schedule of Notional Amount and Fair Value of Open Foreign Currency Forward Contract) (Details) In Thousands, unless otherwise specified	Dec. 31, 2014 Financial Institution Counterparties [Member] Other Assets [Member] Not Designated as Hedging Instrument [Member] CAD	Dec. 31, 2014 Financial Institution Counterparties [Member] Other Assets [Member] Not Designated as Hedging Instrument [Member] EUR (€)	Dec. 31, 2013 Financial Institution Counterparties [Member] Other Assets [Member] Not Designated as Hedging Instrument [Member] CAD	Dec. 31, 2013 Financial Institution Counterparties [Member] Other Assets [Member] Not Designated as Hedging Instrument [Member] EUR (€)	Dec. 31, 2014 Financial Institution Counterparties [Member] Other Liabilities [Member] Not Designated as Hedging Instrument [Member] CAD	Dec. 31, 2014 Financial Institution Counterparties [Member] Other Liabilities [Member] Not Designated as Hedging Instrument [Member] EUR (€)	Dec. 31, 2014 Financial Institution Counterparties [Member] Other Liabilities [Member] Not Designated as Hedging Instrument [Member] GBP (£)	Dec. 31, 2013 Financial Institution Counterparties [Member] Other Liabilities [Member] Not Designated as Hedging Instrument [Member] CAD	Dec. 31, 2013 Financial Institution Counterparties [Member] Other Liabilities [Member] Not Designated as Hedging Instrument [Member] EUR (€)	Dec. 31, 2013 Financial Institution Counterparties [Member] Other Liabilities [Member] Not Designated as Hedging Instrument [Member] GBP (£)	Dec. 31, 2014 Customer Counterparties [Member] Other Assets [Member] Not Designated as Hedging Instrument [Member] CAD	Dec. 31, 2013 Customer Counterparties [Member] Other Assets [Member] Not Designated as Hedging Instrument [Member] CAD	Dec. 31, 2014 Customer Counterparties [Member] Other Liabilities [Member] Not Designated as Hedging Instrument [Member] CAD	Dec. 31, 2013 Customer Counterparties [Member] Other Liabilities [Member] Not Designated as Hedging Instrument [Member] CAD	Dec. 31, 2014 Eurodollar Foreign Exchange Forward [Member] [Member] Financial Institution Counterparties [Member] USD ($)	Dec. 31, 2013 Eurodollar Foreign Exchange Forward [Member] [Member] Financial Institution Counterparties [Member] USD ($)	Dec. 31, 2014 Foreign Exchange Forward [Member] Financial Institution Counterparties [Member] USD ($)	Dec. 31, 2013 Foreign Exchange Forward [Member] Financial Institution Counterparties [Member] USD ($)	Dec. 31, 2014 Foreign Exchange Forward [Member] Customer Counterparties [Member] USD ($)	Dec. 31, 2013 Foreign Exchange Forward [Member] Customer Counterparties [Member] USD ($)	Dec. 31, 2014 GBP Foreign Exchange Forward [Member] Financial Institution Counterparties [Member] USD ($)	Dec. 31, 2013 GBP Foreign Exchange Forward [Member] Financial Institution Counterparties [Member] USD ($)
Derivative Counter Party [Line Items]
Forward Contracts - Assets, Notional Amount	24,724us-gaap_DerivativeAssetNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember	€ 936us-gaap_DerivativeAssetNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember	18,886us-gaap_DerivativeAssetNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember	€ 1,175us-gaap_DerivativeAssetNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember							0us-gaap_DerivativeAssetNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_CounterpartyNameAxis = cfr_CustomerCounterpartiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember	14,055us-gaap_DerivativeAssetNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_CounterpartyNameAxis = cfr_CustomerCounterpartiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Forward Contracts Liability, Notional Amount					0us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember	0us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember	544us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember	14,078us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember	494us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember	0us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember			24,680us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_CounterpartyNameAxis = cfr_CustomerCounterpartiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember	18,859us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_CounterpartyNameAxis = cfr_CustomerCounterpartiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Forward Contracts - Assets Estimated Fair Value															7us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_DerivativeInstrumentRiskAxis = cfr_EurodollarForeignExchangeForwardMemberMember	5us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_DerivativeInstrumentRiskAxis = cfr_EurodollarForeignExchangeForwardMemberMember	659us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember	85us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember	0us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue / us-gaap_CounterpartyNameAxis = cfr_CustomerCounterpartiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember	45us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue / us-gaap_CounterpartyNameAxis = cfr_CustomerCounterpartiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember
Forward Contracts, Liability Estimated Fair Value															$ 0us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_DerivativeInstrumentRiskAxis = cfr_EurodollarForeignExchangeForwardMemberMember	$ (4)us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_DerivativeInstrumentRiskAxis = cfr_EurodollarForeignExchangeForwardMemberMember	$ 0us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember	$ (23)us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember	$ (615)us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue / us-gaap_CounterpartyNameAxis = cfr_CustomerCounterpartiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember	$ (58)us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue / us-gaap_CounterpartyNameAxis = cfr_CustomerCounterpartiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember	$ (2)us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_DerivativeInstrumentRiskAxis = cfr_GBPForeignExchangeForwardMember	$ 0us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_DerivativeInstrumentRiskAxis = cfr_GBPForeignExchangeForwardMember

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Nominal or face amount used to calculate payments on the derivative asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1B

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959



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-SubTopic 10

-Section 50

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-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959



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Fair value as of the balance sheet date of all foreign currency derivative assets not designated as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Section 50

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-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959

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