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Loans - Investment in Loans Related to Allowance for Loan Losses by Portfolio Segment Disaggregated Based on Impairment Methodology (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial:	$ 5,908,535us-gaap_LoansReceivableCommercialAndIndustrial	$ 5,767,743us-gaap_LoansReceivableCommercialAndIndustrial	$ 5,106,726us-gaap_LoansReceivableCommercialAndIndustrial
Commercial Real Estate	4,074,425us-gaap_LoansReceivableCommercialRealEstate	4,002,097us-gaap_LoansReceivableCommercialRealEstate	3,496,139us-gaap_LoansReceivableCommercialRealEstate
Consumer Real Estate	852,403us-gaap_LoansAndLeasesReceivableConsumerRealEstate	849,051us-gaap_LoansAndLeasesReceivableConsumerRealEstate	818,997us-gaap_LoansAndLeasesReceivableConsumerRealEstate
Consumer and Other	403,118us-gaap_LoansAndLeasesReceivableConsumerInstallmentOther	393,601us-gaap_LoansAndLeasesReceivableConsumerInstallmentOther	352,320us-gaap_LoansAndLeasesReceivableConsumerInstallmentOther
Unearned discounts	(23,668)us-gaap_LoansAndLeasesReceivableDeferredIncome	(24,957)us-gaap_LoansAndLeasesReceivableDeferredIncome	(23,537)us-gaap_LoansAndLeasesReceivableDeferredIncome
Total loans	11,214,813us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome	10,987,535us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome	9,750,645us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
Loans Individually Evaluated for Impairment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial:	31,631us-gaap_LoansReceivableCommercialAndIndustrial / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansIndividuallyEvaluatedForImpairmentMember	32,496us-gaap_LoansReceivableCommercialAndIndustrial / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansIndividuallyEvaluatedForImpairmentMember	19,917us-gaap_LoansReceivableCommercialAndIndustrial / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansIndividuallyEvaluatedForImpairmentMember
Commercial Real Estate	17,660us-gaap_LoansReceivableCommercialRealEstate / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansIndividuallyEvaluatedForImpairmentMember	20,499us-gaap_LoansReceivableCommercialRealEstate / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansIndividuallyEvaluatedForImpairmentMember	21,340us-gaap_LoansReceivableCommercialRealEstate / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansIndividuallyEvaluatedForImpairmentMember
Consumer Real Estate	568us-gaap_LoansAndLeasesReceivableConsumerRealEstate / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansIndividuallyEvaluatedForImpairmentMember	596us-gaap_LoansAndLeasesReceivableConsumerRealEstate / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansIndividuallyEvaluatedForImpairmentMember	718us-gaap_LoansAndLeasesReceivableConsumerRealEstate / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansIndividuallyEvaluatedForImpairmentMember
Consumer and Other	0us-gaap_LoansAndLeasesReceivableConsumerInstallmentOther / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansIndividuallyEvaluatedForImpairmentMember	0us-gaap_LoansAndLeasesReceivableConsumerInstallmentOther / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansIndividuallyEvaluatedForImpairmentMember	264us-gaap_LoansAndLeasesReceivableConsumerInstallmentOther / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansIndividuallyEvaluatedForImpairmentMember
Unearned discounts	0us-gaap_LoansAndLeasesReceivableDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansIndividuallyEvaluatedForImpairmentMember	0us-gaap_LoansAndLeasesReceivableDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansIndividuallyEvaluatedForImpairmentMember	0us-gaap_LoansAndLeasesReceivableDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansIndividuallyEvaluatedForImpairmentMember
Total loans	49,859us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansIndividuallyEvaluatedForImpairmentMember	53,591us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansIndividuallyEvaluatedForImpairmentMember	42,239us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansIndividuallyEvaluatedForImpairmentMember
Loans Collectively Evaluated for Impairment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial:	5,876,904us-gaap_LoansReceivableCommercialAndIndustrial / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansCollectivelyEvaluatedForImpairmentMember	5,735,247us-gaap_LoansReceivableCommercialAndIndustrial / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansCollectivelyEvaluatedForImpairmentMember	5,086,809us-gaap_LoansReceivableCommercialAndIndustrial / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansCollectivelyEvaluatedForImpairmentMember
Commercial Real Estate	4,056,765us-gaap_LoansReceivableCommercialRealEstate / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansCollectivelyEvaluatedForImpairmentMember	3,981,598us-gaap_LoansReceivableCommercialRealEstate / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansCollectivelyEvaluatedForImpairmentMember	3,474,799us-gaap_LoansReceivableCommercialRealEstate / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansCollectivelyEvaluatedForImpairmentMember
Consumer Real Estate	851,835us-gaap_LoansAndLeasesReceivableConsumerRealEstate / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansCollectivelyEvaluatedForImpairmentMember	848,455us-gaap_LoansAndLeasesReceivableConsumerRealEstate / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansCollectivelyEvaluatedForImpairmentMember	818,279us-gaap_LoansAndLeasesReceivableConsumerRealEstate / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansCollectivelyEvaluatedForImpairmentMember
Consumer and Other	403,118us-gaap_LoansAndLeasesReceivableConsumerInstallmentOther / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansCollectivelyEvaluatedForImpairmentMember	393,601us-gaap_LoansAndLeasesReceivableConsumerInstallmentOther / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansCollectivelyEvaluatedForImpairmentMember	352,056us-gaap_LoansAndLeasesReceivableConsumerInstallmentOther / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansCollectivelyEvaluatedForImpairmentMember
Unearned discounts	(23,668)us-gaap_LoansAndLeasesReceivableDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansCollectivelyEvaluatedForImpairmentMember	(24,957)us-gaap_LoansAndLeasesReceivableDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansCollectivelyEvaluatedForImpairmentMember	(23,537)us-gaap_LoansAndLeasesReceivableDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansCollectivelyEvaluatedForImpairmentMember
Total loans	$ 11,164,954us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansCollectivelyEvaluatedForImpairmentMember	$ 10,933,944us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansCollectivelyEvaluatedForImpairmentMember	$ 9,708,406us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansCollectivelyEvaluatedForImpairmentMember

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Amount before allowance of other consumer installment loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount before allowance of consumer real estate loans. Includes, but not limited to, construction financing, residential mortgage loans, and home equity lines of credit. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements.

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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Amount before allowance of loans issued to commercial and industrial institutions. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes real estate loans and loans covered under loss sharing agreements.

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Amount before allowance of commercial loans issued to businesses to acquire, develop, construct, improve, or refinance land or building. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements.

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