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Loans (Non-Accrual Loans, Segregated by Class of Loans) (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Non Accrual Loans Segregated By Class Of Loans [Line Items]    
Non-accrual loans $ 59,925us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest $ 56,720us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
Commercial and Industrial, Energy [Member]    
Non Accrual Loans Segregated By Class Of Loans [Line Items]    
Non-accrual loans 636us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cfr_CommercialAndIndustrialEnergyFinancingReceivableMember		 590us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cfr_CommercialAndIndustrialEnergyFinancingReceivableMember
Commercial and Industrial, Other Commercial [Member]    
Non Accrual Loans Segregated By Class Of Loans [Line Items]    
Non-accrual loans 34,108us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cfr_CommercialAndIndustrialOtherCommercialFinancingReceivableMember		 26,143us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cfr_CommercialAndIndustrialOtherCommercialFinancingReceivableMember
Commercial Real Estate, Buildings, Land and Other [Member]    
Non Accrual Loans Segregated By Class Of Loans [Line Items]    
Non-accrual loans 19,639us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cfr_CommercialRealEstateBuildingsLandAndOtherFinancingReceivableMember		 27,035us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cfr_CommercialRealEstateBuildingsLandAndOtherFinancingReceivableMember
Commercial Real Estate, Construction [Member]    
Non Accrual Loans Segregated By Class Of Loans [Line Items]    
Non-accrual loans 2,792us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		 0us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
Consumer Real Estate [Member]    
Non Accrual Loans Segregated By Class Of Loans [Line Items]    
Non-accrual loans 2,212us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cfr_ConsumerRealEstateFinancingReceivableMember		 2,207us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cfr_ConsumerRealEstateFinancingReceivableMember
Consumer and Other [Member]    
Non Accrual Loans Segregated By Class Of Loans [Line Items]    
Non-accrual loans $ 538us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cfr_ConsumerAndOtherFinancingReceivableMember		 $ 745us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cfr_ConsumerAndOtherFinancingReceivableMember