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Derivative Financial Instruments - Notional Amount and Fair Value of Foreign Currency Forward Contract (Detail) In Thousands, unless otherwise specified | Mar. 31, 2015 Financial Institution Counterparties [Member] Other Assets [Member] Non Designated as Hedging Instrument [Member] CAD | Mar. 31, 2015 Financial Institution Counterparties [Member] Other Assets [Member] Non Designated as Hedging Instrument [Member] EUR (€) | Mar. 31, 2015 Financial Institution Counterparties [Member] Other Assets [Member] Non Designated as Hedging Instrument [Member] GBP (£) | Dec. 31, 2014 Financial Institution Counterparties [Member] Other Assets [Member] Non Designated as Hedging Instrument [Member] CAD | Dec. 31, 2014 Financial Institution Counterparties [Member] Other Assets [Member] Non Designated as Hedging Instrument [Member] EUR (€) | Dec. 31, 2014 Financial Institution Counterparties [Member] Other Assets [Member] Non Designated as Hedging Instrument [Member] GBP (£) | Mar. 31, 2015 Financial Institution Counterparties [Member] Other Liabilities [Member] Non Designated as Hedging Instrument [Member] GBP (£) | Dec. 31, 2014 Financial Institution Counterparties [Member] Other Liabilities [Member] Non Designated as Hedging Instrument [Member] GBP (£) | Mar. 31, 2015 Customer Counterparties [Member] Other Liabilities [Member] Non Designated as Hedging Instrument [Member] CAD | Dec. 31, 2014 Customer Counterparties [Member] Other Liabilities [Member] Non Designated as Hedging Instrument [Member] CAD | Mar. 31, 2015 Foreign Exchange Forward [Member] Financial Institution Counterparties [Member] USD ($) | Dec. 31, 2014 Foreign Exchange Forward [Member] Financial Institution Counterparties [Member] USD ($) | Mar. 31, 2015 Foreign Exchange Forward [Member] Customer Counterparties [Member] USD ($) | Dec. 31, 2014 Foreign Exchange Forward [Member] Customer Counterparties [Member] USD ($) | Mar. 31, 2015 GBP Foreign Exchange Forward [Member] Financial Institution Counterparties [Member] USD ($) | Dec. 31, 2014 GBP Foreign Exchange Forward [Member] Financial Institution Counterparties [Member] USD ($) | Mar. 31, 2015 Eurodollar Future [Member] Financial Institution Counterparties [Member] USD ($) | Dec. 31, 2014 Eurodollar Future [Member] Financial Institution Counterparties [Member] USD ($)
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Derivative Counter Party [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forward Contracts – Assets Notional Amount | 22,384 us-gaap_DerivativeAssetNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | € 790 us-gaap_DerivativeAssetNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | £ 486 us-gaap_DerivativeAssetNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 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 | £ 0 us-gaap_DerivativeAssetNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / 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 | 544 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 22,339 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_CounterpartyNameAxis = cfr_CustomerCounterpartiesMember / 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 |  |  |  |  |  |  |  |
Forward Contracts – Assets Estimated Fair Value |  |  |  |  |  |  |  |  |  |  | 329 us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember | 659 us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember |  |  | 2 us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_DerivativeInstrumentRiskAxis = cfr_GBPForeignExchangeForwardMember | 0 us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_DerivativeInstrumentRiskAxis = cfr_GBPForeignExchangeForwardMember | 11 us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EurodollarFutureMember | 7 us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EurodollarFutureMember
Forward Contracts – Liability Estimated Fair Value |  |  |  |  |  |  |  |  |  |  |  |  | $ (284)us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue / us-gaap_CounterpartyNameAxis = cfr_CustomerCounterpartiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember | $ (615)us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue / us-gaap_CounterpartyNameAxis = cfr_CustomerCounterpartiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember | $ 0 us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_DerivativeInstrumentRiskAxis = cfr_GBPForeignExchangeForwardMember | $ (2)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 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 Reference 3: 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=56946850&loc=SL5580258-113959 + 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=56946850&loc=SL5624163-113959 + Details
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