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Employee Benefit Plans (Summary of Activity in Corporation's Active Stock Plans) (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Beginning Balance, Shares Available for Grant 2,862,603us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant 1,157,413us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant 1,963,455us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Authorized, Shares Available for Grant 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized 2,293,660us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized  
Granted, Shares Available for Grant (955,443)cfr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNumberOfSharesAvailableForGrantGranted (635,360)cfr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNumberOfSharesAvailableForGrantGranted (825,542)cfr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNumberOfSharesAvailableForGrantGranted
Forfeited, Shares Available for Grant 66,267cfr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresSharesAvailableForGrant 46,890cfr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresSharesAvailableForGrant 19,750cfr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresSharesAvailableForGrant
Cancelled/expired, Shares Available for Grant 0cfr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsCancelledOrExpiredSharesAvailableForGrant 0cfr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsCancelledOrExpiredSharesAvailableForGrant (250)cfr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsCancelledOrExpiredSharesAvailableForGrant
Ending Balance, Shares Available for Grant 1,973,427us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant 2,862,603us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant 1,157,413us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Beginning Balance, Director Deferred Stock Units Outstanding 33,224cfr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsDeferredStockUnitsOutstanding 27,724cfr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsDeferredStockUnitsOutstanding 22,092cfr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsDeferredStockUnitsOutstanding
Granted, Director Deferred Stock Units Outstanding 5,643cfr_ShareBasedCompensationArrangementByShareBasedPaymentsAwardGrantDeferredStockUnitsOutstanding 5,500cfr_ShareBasedCompensationArrangementByShareBasedPaymentsAwardGrantDeferredStockUnitsOutstanding 5,632cfr_ShareBasedCompensationArrangementByShareBasedPaymentsAwardGrantDeferredStockUnitsOutstanding
Ending Balance, Director Deferred Stock Units Outstanding 38,867cfr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsDeferredStockUnitsOutstanding 33,224cfr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsDeferredStockUnitsOutstanding 27,724cfr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsDeferredStockUnitsOutstanding
Stock options exercised, Number of Shares (594,231)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised (1,319,786)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised (206,366)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Beginning Balance, Weighted-Average Grant-Date Fair Value $ 13.74us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue $ 11.07us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue  
Ending Balance, Weighted-Average Grant-Date Fair Value $ 16.97us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue $ 13.74us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue $ 11.07us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
Non-Vested Stock Awards/ Stock Units Outstanding [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Beginning Balance, Number of Shares 199,740us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= cfr_NonVestedStockAwardsOutstandingMember
188,560us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= cfr_NonVestedStockAwardsOutstandingMember
169,530us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= cfr_NonVestedStockAwardsOutstandingMember
Granted, Number of Shares 32,050us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= cfr_NonVestedStockAwardsOutstandingMember
38,010us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= cfr_NonVestedStockAwardsOutstandingMember
49,130us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= cfr_NonVestedStockAwardsOutstandingMember
Stock awards vested, Number of Shares (56,300)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber
/ us-gaap_AwardTypeAxis
= cfr_NonVestedStockAwardsOutstandingMember
(26,830)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber
/ us-gaap_AwardTypeAxis
= cfr_NonVestedStockAwardsOutstandingMember
(30,100)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber
/ us-gaap_AwardTypeAxis
= cfr_NonVestedStockAwardsOutstandingMember
Ending Balance, Number of Shares 175,490us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= cfr_NonVestedStockAwardsOutstandingMember
199,740us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= cfr_NonVestedStockAwardsOutstandingMember
188,560us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= cfr_NonVestedStockAwardsOutstandingMember
Beginning Balance, Weighted-Average Grant-Date Fair Value $ 55.32us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cfr_NonVestedStockAwardsOutstandingMember
$ 51.67us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cfr_NonVestedStockAwardsOutstandingMember
$ 50.33us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cfr_NonVestedStockAwardsOutstandingMember
Granted, Weighted-Average Grant-Date Fair Value $ 78.92us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cfr_NonVestedStockAwardsOutstandingMember
$ 71.39us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cfr_NonVestedStockAwardsOutstandingMember
$ 54.56us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cfr_NonVestedStockAwardsOutstandingMember
Stock awards vested, Weighted-Average Grant-Date Fair Value $ 52.46us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cfr_NonVestedStockAwardsOutstandingMember
$ 50.64us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cfr_NonVestedStockAwardsOutstandingMember
$ 52.44us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cfr_NonVestedStockAwardsOutstandingMember
Ending Balance, Weighted-Average Grant-Date Fair Value $ 60.55us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cfr_NonVestedStockAwardsOutstandingMember
$ 55.32us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cfr_NonVestedStockAwardsOutstandingMember
$ 51.67us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ 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 4,738,690us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= cfr_StockOptionsOutstandingMember
5,513,516us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= cfr_StockOptionsOutstandingMember
4,968,822us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= cfr_StockOptionsOutstandingMember
Granted, Number of Shares 917,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= cfr_StockOptionsOutstandingMember
591,850us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= cfr_StockOptionsOutstandingMember
770,780us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= cfr_StockOptionsOutstandingMember
Stock options exercised, Number of Shares (560,291)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= cfr_StockOptionsOutstandingMember
(1,319,786)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= cfr_StockOptionsOutstandingMember
(206,336)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= cfr_StockOptionsOutstandingMember
Forfeited, Number of Shares (66,267)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
/ us-gaap_AwardTypeAxis
= cfr_StockOptionsOutstandingMember
(46,890)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
/ us-gaap_AwardTypeAxis
= cfr_StockOptionsOutstandingMember
(19,750)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
/ us-gaap_AwardTypeAxis
= cfr_StockOptionsOutstandingMember
Ending Balance, Number of Shares 5,029,882us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= cfr_StockOptionsOutstandingMember
4,738,690us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= cfr_StockOptionsOutstandingMember
5,513,516us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= cfr_StockOptionsOutstandingMember
Beginning Balance, Weighted-Average Exercise Price $ 54.35us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= cfr_StockOptionsOutstandingMember
$ 51.94us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= cfr_StockOptionsOutstandingMember
$ 51.49us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= cfr_StockOptionsOutstandingMember
Granted, Weighted-Average Exercise Price $ 78.93us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= cfr_StockOptionsOutstandingMember
$ 71.38us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= cfr_StockOptionsOutstandingMember
$ 54.56us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= cfr_StockOptionsOutstandingMember
Stock options exercised, Weighted-Average Exercise Price $ 52.04us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= cfr_StockOptionsOutstandingMember
$ 52.02us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= cfr_StockOptionsOutstandingMember
$ 50.96us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= cfr_StockOptionsOutstandingMember
Forfeited, Weighted-Average Exercise Price $ 62.21us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= cfr_StockOptionsOutstandingMember
$ 46.05us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= cfr_StockOptionsOutstandingMember
$ 50.49us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= cfr_StockOptionsOutstandingMember
Ending Balance, Weighted-Average Exercise Price $ 58.99us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= cfr_StockOptionsOutstandingMember
$ 54.35us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= cfr_StockOptionsOutstandingMember
$ 51.94us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= cfr_StockOptionsOutstandingMember