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Employee Benefit Plans (Narrative) (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Expense related to benefit plans | $ 10,800,000 us-gaap_PensionAndOtherPostretirementBenefitExpense | $ 11,400,000 us-gaap_PensionAndOtherPostretirementBenefitExpense | $ 9,200,000 us-gaap_PensionAndOtherPostretirementBenefitExpense
Net actuarial loss expected to be recognized | 7,000,000 cfr_OtherComprehensiveIncomeNetActuarialGainLossExpectedToBeRecognized |  |
Modeling process confidence ratio | 90.00%cfr_ModelingProcessConfidenceRatio |  |
Percentage of equity investments in mutual fund | 71.00%cfr_PercentageOfEquityInvestmentsInMutualFund |  |
Assumed long-term rate of return | 7.75%cfr_AssumedLongTermRateOfReturnInDeterminationOfNetPeriodicBenefitCost |  |
Expected defined benefit plans contribution within a year | 1,100,000 cfr_ExpectedDefinedBenefitPlansContributionWithinOneYear |  |
Target percentage of pay at age 55 | 45.00%cfr_TargetPercentageOfPayAtAgeOfFiftyFive |  |
Target percentage of pay at age 60 | 60.00%cfr_TargetPercentageOfPayAtAgeOfSixty |  |
Stock purchase plan expense | 9,142,000 us-gaap_StockOptionPlanExpense | 8,814,000 us-gaap_StockOptionPlanExpense | 9,663,000 us-gaap_StockOptionPlanExpense
Maximum exercise period of options granted, years | 10 years |  |
Awards other than in the form of stock options | 281,840 cfr_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsNumberofAdditionalSharesAuthorized |  |
Intrinsic value of outstanding in-the-money stock options | 66,500,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue |  |
Outstanding in-the-money exercisable stock options | 56,400,000 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 |  |
Weighted-average period, unrecognized expense related to stock options, years | 3 years 1 month 6 days |  |
Weighted-average period, unrecognized expense related to non-vested stock awards, years | 2 years 6 months |  |
Weighted-average fair value of stock options granted | $ 16.97 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue | $ 13.74 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue | $ 11.07 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
401(k) Plan [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Contribution match by employer | 100.00%cfr_DefinedBenefitPlanContributionEmployerMatchPercentage / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = cfr_FourZeroOneKPlanMember |  |
Participants contribution eligible for match | 6.00%cfr_ParticipantsContributionEligibleForMatch / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = cfr_FourZeroOneKPlanMember |  |
Stock purchase plan expense | $ 12,300,000 us-gaap_StockOptionPlanExpense / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = cfr_FourZeroOneKPlanMember | $ 11,500,000 us-gaap_StockOptionPlanExpense / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = cfr_FourZeroOneKPlanMember | $ 10,800,000 us-gaap_StockOptionPlanExpense / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = cfr_FourZeroOneKPlanMember
Equity Securities [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Target asset allocation percentage | 65.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember |  |
Fixed Income Securities [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Target asset allocation percentage | 32.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_FixedIncomeSecuritiesMember |  |
2005 Plan [Member] | Stock Options [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Life period of options awarded, years | 10 years | 10 years | 10 years
Vesting period of options awarded, years | 4 years | 4 years | 4 years
2005 Plan [Member] | Non Vested Stock Awards and Stock Units [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Life period of options awarded, years | 10 years | 10 years | 10 years
Cliff vesting period, years | 4 years | 4 years | 4 years
2007 Directors Plan [Member] | Stock Options [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Options awarded during period | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember / us-gaap_PlanNameAxis = cfr_TwoThousandSevenDirectorPlanMember | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember / us-gaap_PlanNameAxis = cfr_TwoThousandSevenDirectorPlanMember | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember / us-gaap_PlanNameAxis = cfr_TwoThousandSevenDirectorPlanMember
Minimum [Member] | 401(k) Plan [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Contribution percentage of eligible compensation | 2.00%cfr_DefinedBenefitPlanContributionsByPlanParticipantsPercentage / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = cfr_FourZeroOneKPlanMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Maximum [Member] | 401(k) Plan [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Contribution percentage of eligible compensation | 50.00%cfr_DefinedBenefitPlanContributionsByPlanParticipantsPercentage / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = cfr_FourZeroOneKPlanMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |

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- Definition Defined benefit plan contribution employer match percentage + References No definition available. + Details
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- Definition Defined Benefit Plan Contributions By Plan Participants Percentage + References No definition available. + Details
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- Definition Expected Defined Benefit Plans Contribution Within One Year + References No definition available. + Details
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- Definition Percentage of equity investments in mutual fund + References No definition available. + Details
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- Definition Target percentage of pay at the age of fifty five + References No definition available. + Details
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- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The amount of pension and other (such as medical, dental and life insurance) postretirement benefit costs recognized during the period for (1) defined benefit plans (periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss) on assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments) and for (2) defined contribution plans (to the extent that a plan's defined contributions to an individual's account are to be made for periods in which that individual renders services, the net cost for a period is the contribution called for in that period; if a plan calls for contributions for periods after an individual retires or terminates, the estimated cost is accrued during the employee's service period). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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