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Commitments and Contingencies - Financial Instruments with Off-Balance-Sheet Risk (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Standby Letters of Credit [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Financial instruments with off- balance-sheet risk | $ 248,267 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_StandbyLettersOfCreditMember | $ 248,360 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_StandbyLettersOfCreditMember
Commitments to Extend Credit [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Financial instruments with off- balance-sheet risk | 8,033,631 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_CommitmentsToExtendCreditMember | 7,955,779 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_CommitmentsToExtendCreditMember
Deferred Standby Letter of Credit Fees [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Financial instruments with off- balance-sheet risk | $ 1,798 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FinancialInstrumentAxis = cfr_DeferredStandbyLetterOfCreditFeesMember | $ 1,942 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FinancialInstrumentAxis = cfr_DeferredStandbyLetterOfCreditFeesMember

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- Definition The fair value of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Details
Name: | us-gaap_FinancialInstrumentAxis=cfr_DeferredStandbyLetterOfCreditFeesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CommitmentsToExtendCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |