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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 ($) | Dec. 31, 2013 GBP Foreign Exchange Forward [Member] Financial Institution Counterparties [Member] USD ($)
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Derivative Counter Party [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forward Contracts - Assets, Notional Amount | 24,724 us-gaap_DerivativeAssetNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | € 936 us-gaap_DerivativeAssetNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 18,886 us-gaap_DerivativeAssetNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | € 1,175 us-gaap_DerivativeAssetNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  |  |  |  |  |  | 0 us-gaap_DerivativeAssetNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_CounterpartyNameAxis = cfr_CustomerCounterpartiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 14,055 us-gaap_DerivativeAssetNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_CounterpartyNameAxis = cfr_CustomerCounterpartiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  |  |  |  |  |  |  |  |  |
Forward Contracts Liability, Notional Amount |  |  |  |  | 0 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 0 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 544 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 14,078 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 494 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 0 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  |  | 24,680 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_CounterpartyNameAxis = cfr_CustomerCounterpartiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 18,859 us-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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_DerivativeInstrumentRiskAxis = cfr_EurodollarForeignExchangeForwardMemberMember | 5 us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_DerivativeInstrumentRiskAxis = cfr_EurodollarForeignExchangeForwardMemberMember | 659 us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember | 85 us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember | 0 us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue / us-gaap_CounterpartyNameAxis = cfr_CustomerCounterpartiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember | 45 us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue / us-gaap_CounterpartyNameAxis = cfr_CustomerCounterpartiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember |  |
Forward Contracts, Liability Estimated Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 us-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 | $ 0 us-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 | $ 0 us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_DerivativeInstrumentRiskAxis = cfr_GBPForeignExchangeForwardMember

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- Definition 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 + Details
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- Definition Nominal or face amount used to calculate payments on the derivative liability. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 + Details
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- Definition 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 -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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