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Capital and Regulatory Matters (Narrative) (Detail) (USD $)
 0 Months Ended 12 Months Ended 0 Months Ended
Aug. 13, 2013
Feb. 12, 2013
Dec. 31, 2014
quarter
Dec. 31, 2013
Feb. 15, 2013
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]          
Non-cumulative perpetual preferred stock     $ 144,500,000cfr_PreferredStockValueIssuedIncludeForRegulatoryTierOneCapitalCalculations $ 144,500,000cfr_PreferredStockValueIssuedIncludeForRegulatoryTierOneCapitalCalculations  
Non-cumulative perpetual preferred stock, dividend rate percentage     5.375%us-gaap_PreferredStockDividendRatePercentage 5.375%us-gaap_PreferredStockDividendRatePercentage  
Trust preferred securities     133,000,000us-gaap_ProceedsFromIssuanceOfTrustPreferredSecurities 120,000,000us-gaap_ProceedsFromIssuanceOfTrustPreferredSecurities  
Corporation's aggregate subordinated notes     137,115,000us-gaap_JuniorSubordinatedNotes 123,712,000us-gaap_JuniorSubordinatedNotes  
Preferred stock, shares issued     6,000,000us-gaap_PreferredStockSharesIssued 6,000,000us-gaap_PreferredStockSharesIssued  
Preferred stock, par value     $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare  
Issuance of preferred stock       144,486,000us-gaap_StockIssuedDuringPeriodValueNewIssues  
Accelerated share repurchase authorized amount     150,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount    
Amount paid under accelerated share repurchase agreement   144,000,000cfr_AcceleratedShareRepurchaseProgramRepurchaseAmount      
Shares repurchased under accelerated share repurchase program 331,671cfr_AcceleratedShareRepurchaseProgramRepurchaseShare 1,905,077cfr_AcceleratedShareRepurchaseProgramRepurchaseShare      
Accelerated Share Repurchase Program Repurchase Share Percent   80.00%cfr_AcceleratedShareRepurchaseProgramRepurchaseSharePercent      
Aggregate dividends available for payment without prior regulatory approval     363,900,000us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithoutRegulatoryApproval    
Maximum number of quarterly periods by which the corporation has the right to defer interest payments on junior subordinated deferrable interest debentures     20cfr_Maximumnumberofquarterlyperiodsbywhichthecorporationhastherighttodeferinterestpaymentsonjuniorsubordinateddeferrableinterestdebentures    
Non Cumulative Perpetual Preferred Stock And Seriesa Preferred Stock [Member]          
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]          
Preferred stock, shares issued         6,000,000us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= cfr_NonCumulativePerpetualPreferredStockAndSeriesaPreferredStockMember
Series A Preferred Stock, Liquidation preference value         150,000,000us-gaap_PreferredStockLiquidationPreferenceValue
/ us-gaap_StatementClassOfStockAxis
= cfr_NonCumulativePerpetualPreferredStockAndSeriesaPreferredStockMember
Issuance of preferred stock         144,500,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementClassOfStockAxis
= cfr_NonCumulativePerpetualPreferredStockAndSeriesaPreferredStockMember
Non Cumulative Perpetual Preferred Stock [Member]          
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]          
Non-cumulative perpetual preferred stock, dividend rate percentage         5.375%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= cfr_NonCumulativePerpetualPreferredStockMember
Preferred stock, par value         $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= cfr_NonCumulativePerpetualPreferredStockMember
Series A Preferred Stock [Member]          
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]          
Series A Preferred Stock, Liquidation preference value     25us-gaap_PreferredStockLiquidationPreferenceValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember		 25us-gaap_PreferredStockLiquidationPreferenceValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember		  
Liquidation preference per share         $ 25us-gaap_PreferredStockLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
Floating Rate Subordinated Notes [Member]          
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]          
Corporation's aggregate subordinated notes     100,000,000us-gaap_JuniorSubordinatedNotes
/ us-gaap_DebtInstrumentAxis
= cfr_FloatingRateSubordinatedNotesMember		    
Per year percentage of decreases in permissible portion of Subordinate Note included in Total Capital     20.00%cfr_PermissiblePercentageDecreasedEachOfFinalFiveYearsOfTermOfNotes
/ us-gaap_DebtInstrumentAxis
= cfr_FloatingRateSubordinatedNotesMember		    
Final years of the term of the notes     5 years    
Permissible portion of subordinated note included in total capital     $ 40,000,000cfr_PermissiblePortionOfSubordinatedNotesIncludedInCapital
/ us-gaap_DebtInstrumentAxis
= cfr_FloatingRateSubordinatedNotesMember		 $ 60,000,000cfr_PermissiblePortionOfSubordinatedNotesIncludedInCapital
/ us-gaap_DebtInstrumentAxis
= cfr_FloatingRateSubordinatedNotesMember