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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 |  |  | $ 144,500,000 cfr_PreferredStockValueIssuedIncludeForRegulatoryTierOneCapitalCalculations | $ 144,500,000 cfr_PreferredStockValueIssuedIncludeForRegulatoryTierOneCapitalCalculations |
Non-cumulative perpetual preferred stock, dividend rate percentage |  |  | 5.375%us-gaap_PreferredStockDividendRatePercentage | 5.375%us-gaap_PreferredStockDividendRatePercentage |
Trust preferred securities |  |  | 133,000,000 us-gaap_ProceedsFromIssuanceOfTrustPreferredSecurities | 120,000,000 us-gaap_ProceedsFromIssuanceOfTrustPreferredSecurities |
Corporation's aggregate subordinated notes |  |  | 137,115,000 us-gaap_JuniorSubordinatedNotes | 123,712,000 us-gaap_JuniorSubordinatedNotes |
Preferred stock, shares issued |  |  | 6,000,000 us-gaap_PreferredStockSharesIssued | 6,000,000 us-gaap_PreferredStockSharesIssued |
Preferred stock, par value |  |  | $ 0.01 us-gaap_PreferredStockParOrStatedValuePerShare | $ 0.01 us-gaap_PreferredStockParOrStatedValuePerShare |
Issuance of preferred stock |  |  |  | 144,486,000 us-gaap_StockIssuedDuringPeriodValueNewIssues |
Accelerated share repurchase authorized amount |  |  | 150,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount |  |
Amount paid under accelerated share repurchase agreement |  | 144,000,000 cfr_AcceleratedShareRepurchaseProgramRepurchaseAmount |  |  |
Shares repurchased under accelerated share repurchase program | 331,671 cfr_AcceleratedShareRepurchaseProgramRepurchaseShare | 1,905,077 cfr_AcceleratedShareRepurchaseProgramRepurchaseShare |  |  |
Accelerated Share Repurchase Program Repurchase Share Percent |  | 80.00%cfr_AcceleratedShareRepurchaseProgramRepurchaseSharePercent |  |  |
Aggregate dividends available for payment without prior regulatory approval |  |  | 363,900,000 us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithoutRegulatoryApproval |  |
Maximum number of quarterly periods by which the corporation has the right to defer interest payments on junior subordinated deferrable interest debentures |  |  | 20 cfr_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 |  |  |  |  | 6,000,000 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = cfr_NonCumulativePerpetualPreferredStockAndSeriesaPreferredStockMember
Series A Preferred Stock, Liquidation preference value |  |  |  |  | 150,000,000 us-gaap_PreferredStockLiquidationPreferenceValue / us-gaap_StatementClassOfStockAxis = cfr_NonCumulativePerpetualPreferredStockAndSeriesaPreferredStockMember
Issuance of preferred stock |  |  |  |  | 144,500,000 us-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 |  |  |  |  | $ 0.01 us-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 |  |  | 25 us-gaap_PreferredStockLiquidationPreferenceValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember | 25 us-gaap_PreferredStockLiquidationPreferenceValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |
Liquidation preference per share |  |  |  |  | $ 25 us-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 |  |  | 100,000,000 us-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 |  |  | $ 40,000,000 cfr_PermissiblePortionOfSubordinatedNotesIncludedInCapital / us-gaap_DebtInstrumentAxis = cfr_FloatingRateSubordinatedNotesMember | $ 60,000,000 cfr_PermissiblePortionOfSubordinatedNotesIncludedInCapital / us-gaap_DebtInstrumentAxis = cfr_FloatingRateSubordinatedNotesMember |

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