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Stock-Based Compensation - Summary of Activity in Corporation's Active Stock Plans (Detail) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Shares Available for Grant 1,973,427us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant  
Authorized, Shares Available for Grant 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized  
Granted, Shares Available for Grant 0cfr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNumberOfSharesAvailableForGrantGranted  
Stock options exercised, Shares Available for Grant 0cfr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNumberOfSharesAvailableForGrantExercised  
Stock awards vested, Shares Available for Grant 0cfr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNumberOfSharesAvailableForGrantVested  
Forfeited, Shares Available for Grant 5,191cfr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresSharesAvailableForGrant  
Cancelled/expired, Shares Available for Grant 0cfr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsCancelledOrExpiredSharesAvailableForGrant  
Ending Balance, Shares Available for Grant 1,978,618us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant  
Beginning Balance, Director Deferred Stock Units Outstanding 38,867cfr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsDeferredStockUnitsOutstanding  
Granted, Director Deferred Stock Units Outstanding 0cfr_ShareBasedCompensationArrangementByShareBasedPaymentsAwardGrantDeferredStockUnitsOutstanding  
Stock options exercised, Director Deferred Stock Units Outstanding 0cfr_ShareBasedCompensationArrangementByShareBasedPaymentsAwardExercisesDeferredStockUnitsOutstanding  
Stock awards vested, Director Deferred Stock Units Outstanding 0cfr_ShareBasedCompensationArrangementByShareBasedPaymentsAwardVestedDeferredStockUnitsOutstanding  
Forfeited, Director Deferred Stock Units Outstanding 0cfr_ShareBasedCompensationArrangementByShareBasedPaymentsAwardForfeituresDeferredStockUnitsOutstanding  
Cancelled/expired, Director Deferred Stock Units Outstanding 0cfr_ShareBasedCompensationArrangementByShareBasedPaymentsAwardCancelledDeferredStockUnitsOutstanding  
Ending Balance, Director Deferred Stock Units Outstanding 38,867cfr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsDeferredStockUnitsOutstanding  
Stock options exercised, Number of Shares (14,350)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised (329,825)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Non-Vested Stock Awards/Stock Units Outstanding [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares 175,490us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= cfr_NonVestedStockAwardsOutstandingMember
 
Granted, Number of Shares 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= cfr_NonVestedStockAwardsOutstandingMember
 
Stock options exercised, Number of Shares 0us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= cfr_NonVestedStockAwardsOutstandingMember
 
Stock awards vested, Number of Shares 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber
/ us-gaap_AwardTypeAxis
= cfr_NonVestedStockAwardsOutstandingMember
 
Forfeited, Number of Shares 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
/ us-gaap_AwardTypeAxis
= cfr_NonVestedStockAwardsOutstandingMember
 
Cancelled/expired, Number of Shares 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod
/ us-gaap_AwardTypeAxis
= cfr_NonVestedStockAwardsOutstandingMember
 
Ending Balance, Number of Shares 175,490us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= cfr_NonVestedStockAwardsOutstandingMember
 
Beginning Balance, Weighted-Average Grant-Date Fair Value 60.55us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cfr_NonVestedStockAwardsOutstandingMember
 
Granted, Weighted-Average Grant-Date Fair Value 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cfr_NonVestedStockAwardsOutstandingMember
 
Stock awards vested, Weighted-Average Grant-Date Fair Value 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cfr_NonVestedStockAwardsOutstandingMember
 
Forfeited, Weighted-Average Grant-Date Fair Value 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cfr_NonVestedStockAwardsOutstandingMember
 
Cancelled/expired, Weighted-Average Grant-Date Fair Value 0cfr_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsCancellationsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cfr_NonVestedStockAwardsOutstandingMember
 
Ending Balance, Weighted-Average Grant-Date Fair Value 60.55us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cfr_NonVestedStockAwardsOutstandingMember
 
Stock options exercised, Weighted-Average Exercise Price 0us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= cfr_NonVestedStockAwardsOutstandingMember
 
Stock Options Outstanding [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares 5,029,882us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Granted, Number of Shares 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Stock options exercised, Number of Shares (14,350)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Stock awards vested, Number of Shares 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Forfeited, Number of Shares (5,191)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Cancelled/expired, Number of Shares (193)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Ending Balance, Number of Shares 5,010,148us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Beginning Balance, Weighted-Average Exercise Price 58.99us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Granted, Weighted-Average Exercise Price 0.00us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Stock options exercised, Weighted-Average Exercise Price 50.74us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Stock awards vested, Weighted-Average Exercise Price 0cfr_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsVestedInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Forfeited, Weighted-Average Exercise Price 65.97us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Cancelled/expired, Weighted-Average Exercise Price 71.39us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Ending Balance, Weighted-Average Exercise Price 59.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember