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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	Mar. 31, 2015	Dec. 31, 2014
Designated as Hedging Instrument [Member] | Financial institution counterparties Loan/lease interest rate swaps assets [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	$ 23,422invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateSwapsAssetsMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember	$ 31,614invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateSwapsAssetsMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Estimated Fair Value	138us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateSwapsAssetsMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember	469us-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	40,740invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateSwapsLiabilitiesMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember	37,672invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateSwapsLiabilitiesMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Estimated Fair Value	(3,143)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateSwapsLiabilitiesMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember	(3,179)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateSwapsLiabilitiesMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Non Designated as Hedging Instrument [Member] | Financial institution counterparties Loan/lease interest rate swaps assets [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	0invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateSwapsAssetsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember	69,842invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateSwapsAssetsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Estimated Fair Value	0us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateSwapsAssetsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember	719us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateSwapsAssetsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Non Designated as Hedging Instrument [Member] | Financial institution counterparties Loan/lease interest rate swaps liabilities [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	862,403invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateSwapsLiabilitiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember	765,979invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateSwapsLiabilitiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Estimated Fair Value	(47,039)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateSwapsLiabilitiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember	(38,952)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateSwapsLiabilitiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Non Designated as Hedging Instrument [Member] | Financial institution counterparties Loan/lease interest-rate caps assets [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	81,058invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateCapsAssetsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember	73,058invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateCapsAssetsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Estimated Fair Value	1,055us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateCapsAssetsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember	1,003us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = cfr_FinancialInstitutionCounterpartiesLoanLeaseInterestRateCapsAssetsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Non Designated as Hedging Instrument [Member] | Customer counterparties Loan/lease interest rate swaps assets [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	862,403invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = cfr_CustomerCounterpartiesLoanLeaseInterestRateSwapsAssetsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember	765,979invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = cfr_CustomerCounterpartiesLoanLeaseInterestRateSwapsAssetsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Estimated Fair Value	46,995us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = cfr_CustomerCounterpartiesLoanLeaseInterestRateSwapsAssetsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember	38,910us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = cfr_CustomerCounterpartiesLoanLeaseInterestRateSwapsAssetsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Non Designated as Hedging Instrument [Member] | Customer counterparties Loan/lease interest rate swaps liabilities [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	0invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = cfr_CustomerCounterpartiesLoanLeaseInterestRateSwapsLiabilitiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember	69,842invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = cfr_CustomerCounterpartiesLoanLeaseInterestRateSwapsLiabilitiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Estimated Fair Value	0us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = cfr_CustomerCounterpartiesLoanLeaseInterestRateSwapsLiabilitiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember	(719)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = cfr_CustomerCounterpartiesLoanLeaseInterestRateSwapsLiabilitiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Non Designated as Hedging Instrument [Member] | Customer counterparties Loan/lease interest rate caps liabilities [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	81,058invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = cfr_CustomerCounterpartiesLoanLeaseInterestRateCapsLiabilitiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember	73,058invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = cfr_CustomerCounterpartiesLoanLeaseInterestRateCapsLiabilitiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Estimated Fair Value	$ (1,055)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = cfr_CustomerCounterpartiesLoanLeaseInterestRateCapsLiabilitiesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember	$ (1,003)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

Name:	invest_DerivativeNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

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=49121117&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=49121117&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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Namespace Prefix:	us-gaap_
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Balance Type:	debit
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- Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
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- Details

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Namespace Prefix:
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X

- Details

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