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Derivative Financial Instruments (Schedule of Weighted-Average Rates Paid and Received for Interest Rate Swaps Outstanding) (Detail) | Dec. 31, 2014
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Weighted Average Interest Rate Paid [Member] |
Weighted Average Discount Rate [Line Items] |
Fair Value Hedge Loan Lease Interest Rate Swaps | 2.80%cfr_FairValueHedgeLoanLeaseInterestRateSwaps / us-gaap_DerivativeByNatureAxis = cfr_WeightedAverageInterestRatePaidMember
Weighted-Average Interest Rate Received [Member] |
Weighted Average Discount Rate [Line Items] |
Fair Value Hedge Loan Lease Interest Rate Swaps | 0.16%cfr_FairValueHedgeLoanLeaseInterestRateSwaps / us-gaap_DerivativeByNatureAxis = cfr_WeightedAverageInterestRateReceivedMember
Financial Institution Counterparties [Member] | Weighted Average Interest Rate Paid [Member] |
Weighted Average Discount Rate [Line Items] |
Non-hedging interest rate swaps - financial institution counterparties | 4.05%cfr_NonHedgingInterestRateSwaps / us-gaap_DerivativeByNatureAxis = cfr_WeightedAverageInterestRatePaidMember / us-gaap_HedgingDesignationAxis = cfr_FinancialInstitutionCounterpartiesMember
Financial Institution Counterparties [Member] | Weighted-Average Interest Rate Received [Member] |
Weighted Average Discount Rate [Line Items] |
Non-hedging interest rate swaps - financial institution counterparties | 1.67%cfr_NonHedgingInterestRateSwaps / us-gaap_DerivativeByNatureAxis = cfr_WeightedAverageInterestRateReceivedMember / us-gaap_HedgingDesignationAxis = cfr_FinancialInstitutionCounterpartiesMember
Customer Counterparties [Member] | Weighted Average Interest Rate Paid [Member] |
Weighted Average Discount Rate [Line Items] |
Non-hedging interest rate swap - customer counterparties | 1.67%cfr_NonHedgingInterestRateSwaps2 / us-gaap_DerivativeByNatureAxis = cfr_WeightedAverageInterestRatePaidMember / us-gaap_HedgingDesignationAxis = cfr_CustomerCounterpartiesMember
Customer Counterparties [Member] | Weighted-Average Interest Rate Received [Member] |
Weighted Average Discount Rate [Line Items] |
Non-hedging interest rate swap - customer counterparties | 4.05%cfr_NonHedgingInterestRateSwaps2 / us-gaap_DerivativeByNatureAxis = cfr_WeightedAverageInterestRateReceivedMember / us-gaap_HedgingDesignationAxis = cfr_CustomerCounterpartiesMember

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- Definition Fair Value Hedge Loan Lease Interest Rate Swaps + References No definition available. + Details
Name: | cfr_FairValueHedgeLoanLeaseInterestRateSwaps
Namespace Prefix: | cfr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Non-hedging interest rate swaps + References No definition available. + Details
Name: | cfr_NonHedgingInterestRateSwaps
Namespace Prefix: | cfr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Non-hedging interest rate swaps (2) + References No definition available. + Details
Name: | cfr_NonHedgingInterestRateSwaps2
Namespace Prefix: | cfr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_WeightedAverageDiscountRateLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DerivativeByNatureAxis=cfr_WeightedAverageInterestRatePaidMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DerivativeByNatureAxis=cfr_WeightedAverageInterestRateReceivedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_HedgingDesignationAxis=cfr_CustomerCounterpartiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_HedgingDesignationAxis=cfr_FinancialInstitutionCounterpartiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |