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Derivative Financial Instruments - Schedule of Weighted-Average Rates Paid and Received for Interest Rate Swaps Outstanding (Detail) | Mar. 31, 2015
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Weighted Average Interest Rate Paid [Member] |
Weighted Average Discount Rate [Line Items] |
Fair value hedge loan/lease interest rate swaps | 2.70%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 | 0.17%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 | 4.04%cfr_NonHedgingInterestRateSwaps / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_DerivativeByNatureAxis = cfr_WeightedAverageInterestRatePaidMember
Financial Institution Counterparties [Member] | Weighted-Average Interest Rate Received [Member] |
Weighted Average Discount Rate [Line Items] |
Non-hedging interest rate swaps – financial institution counterparties | 1.74%cfr_NonHedgingInterestRateSwaps / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_DerivativeByNatureAxis = cfr_WeightedAverageInterestRateReceivedMember
Customer Counterparties [Member] | Weighted Average Interest Rate Paid [Member] |
Weighted Average Discount Rate [Line Items] |
Non-hedging interest rate swaps – customer counterparties | 1.74%cfr_NonHedgingInterestRateSwaps2 / us-gaap_CounterpartyNameAxis = cfr_CustomerCounterpartiesMember / us-gaap_DerivativeByNatureAxis = cfr_WeightedAverageInterestRatePaidMember
Customer Counterparties [Member] | Weighted-Average Interest Rate Received [Member] |
Weighted Average Discount Rate [Line Items] |
Non-hedging interest rate swaps – customer counterparties | 4.04%cfr_NonHedgingInterestRateSwaps2 / us-gaap_CounterpartyNameAxis = cfr_CustomerCounterpartiesMember / us-gaap_DerivativeByNatureAxis = cfr_WeightedAverageInterestRateReceivedMember

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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_CounterpartyNameAxis=cfr_CustomerCounterpartiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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