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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
Designated as Hedging Instrument [Member] | Financial Institution Counterparties Loan Lease Interest Rate Swaps Assets [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	$ 31,614invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateSwapsAssetsMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember	$ 50,965invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateSwapsAssetsMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Estimated Fair Value	469us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateSwapsAssetsMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember	1,386us-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	37,672invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateSwapsLiabilitiesMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember	43,631invest_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	69,842invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateSwapsAssetsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember	195,234invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateSwapsAssetsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Estimated Fair Value	719us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateSwapsAssetsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember	9,573us-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	765,979invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateSwapsLiabilitiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember	626,980invest_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	73,058invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateCapsAssetsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember	53,058invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateCapsAssetsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Estimated Fair Value	1,003us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateCapsAssetsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember	1,309us-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	765,979invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = cfr_CustomerCounterpartiesLoanLeaseInterestRateSwapsAssetsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember	626,980invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = cfr_CustomerCounterpartiesLoanLeaseInterestRateSwapsAssetsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Estimated Fair Value	38,910us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = cfr_CustomerCounterpartiesLoanLeaseInterestRateSwapsAssetsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember	32,426us-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	69,842invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = cfr_CustomerCounterpartiesLoanLeaseInterestRateSwapsLiabilitiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember	195,234invest_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	73,058invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = cfr_CustomerCounterpartiesLoanLeaseInterestRateCapsLiabilitiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember	53,058invest_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

X

- 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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Data Type:	xbrli:monetaryItemType
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X

- 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

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- Details

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- Details

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