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Derivative Financial Instruments (Schedule of Notional Amounts and Estimated Fair Values of Interest Rate Derivative Contracts Outstanding) (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Designated as Hedging Instrument [Member] | Financial Institution Counterparties Loan Lease Interest Rate Swaps Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | $ 31,614 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateSwapsAssetsMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | $ 50,965 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateSwapsAssetsMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Estimated Fair Value | 469 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateSwapsAssetsMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 1,386 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateSwapsAssetsMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Designated as Hedging Instrument [Member] | Financial Institution Counterparties Loan Lease Interest Rate Swaps Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 37,672 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateSwapsLiabilitiesMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 43,631 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateSwapsLiabilitiesMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Estimated Fair Value | (3,179)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateSwapsLiabilitiesMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | (4,191)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateSwapsLiabilitiesMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Not Designated as Hedging Instrument [Member] | Financial Institution Counterparties Loan Lease Interest Rate Swaps Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 69,842 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateSwapsAssetsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 195,234 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateSwapsAssetsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Estimated Fair Value | 719 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateSwapsAssetsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 9,573 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateSwapsAssetsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Not Designated as Hedging Instrument [Member] | Financial Institution Counterparties Loan Lease Interest Rate Swaps Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 765,979 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateSwapsLiabilitiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 626,980 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateSwapsLiabilitiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Estimated Fair Value | (38,952)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateSwapsLiabilitiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | (32,469)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateSwapsLiabilitiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Not Designated as Hedging Instrument [Member] | Financial Institution Counterparties Loan Lease Interest Rate Caps Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 73,058 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateCapsAssetsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 53,058 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateCapsAssetsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Estimated Fair Value | 1,003 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateCapsAssetsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 1,309 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateCapsAssetsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Not Designated as Hedging Instrument [Member] | Customer Counterparties Loan Lease Interest Rate Swaps Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 765,979 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = cfr_CustomerCounterpartiesLoanLeaseInterestRateSwapsAssetsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 626,980 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = cfr_CustomerCounterpartiesLoanLeaseInterestRateSwapsAssetsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Estimated Fair Value | 38,910 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = cfr_CustomerCounterpartiesLoanLeaseInterestRateSwapsAssetsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 32,426 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = cfr_CustomerCounterpartiesLoanLeaseInterestRateSwapsAssetsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Not Designated as Hedging Instrument [Member] | Customer Counterparties Loan Lease Interest Rate Swaps Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 69,842 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = cfr_CustomerCounterpartiesLoanLeaseInterestRateSwapsLiabilitiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 195,234 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = cfr_CustomerCounterpartiesLoanLeaseInterestRateSwapsLiabilitiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Estimated Fair Value | (719)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = cfr_CustomerCounterpartiesLoanLeaseInterestRateSwapsLiabilitiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | (9,573)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = cfr_CustomerCounterpartiesLoanLeaseInterestRateSwapsLiabilitiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Not Designated as Hedging Instrument [Member] | Customer Counterparties Loan Lease Interest Rate Caps Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 73,058 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = cfr_CustomerCounterpartiesLoanLeaseInterestRateCapsLiabilitiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 53,058 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = cfr_CustomerCounterpartiesLoanLeaseInterestRateCapsLiabilitiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Estimated Fair Value | $ (1,003)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = cfr_CustomerCounterpartiesLoanLeaseInterestRateCapsLiabilitiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | $ (1,309)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = cfr_CustomerCounterpartiesLoanLeaseInterestRateCapsLiabilitiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + 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 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 + Details
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