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Derivative Financial Instruments - Schedule of Weighted-Average Rates Paid and Received for Interest Rate Swaps Outstanding (Detail) | Mar. 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 | 2.63%
Weighted Average Interest Rate Paid [Member] | Financial Institution Counterparties [Member] |
Weighted Average Discount Rate [Line Items] |
Non-hedging interest rate swaps – financial institution counterparties | 3.67%
Weighted Average Interest Rate Paid [Member] | Customer Counterparties [Member] |
Weighted Average Discount Rate [Line Items] |
Non-hedging interest rate swaps – customer counterparties | 2.11%
Weighted-Average Interest Rate Received [Member] |
Weighted Average Discount Rate [Line Items] |
Fair value hedge loan/lease interest rate swaps | 0.15%
Weighted-Average Interest Rate Received [Member] | Financial Institution Counterparties [Member] |
Weighted Average Discount Rate [Line Items] |
Non-hedging interest rate swaps – financial institution counterparties | 2.11%
Weighted-Average Interest Rate Received [Member] | Customer Counterparties [Member] |
Weighted Average Discount Rate [Line Items] |
Non-hedging interest rate swaps – customer counterparties | 3.67%

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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