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Premises and Equipment (Narrative) (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Property, Plant and Equipment [Abstract] |  |  |
Depreciation and amortization of premises and equipment, year to date | $ 23.5 cfr_DepreciationAndAmortizationOfPremisesAndEquipmentYearToDate | $ 22.5 cfr_DepreciationAndAmortizationOfPremisesAndEquipmentYearToDate | $ 21.8 cfr_DepreciationAndAmortizationOfPremisesAndEquipmentYearToDate

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- Definition Depreciation and amortization of premises and equipment, year to date. + References No definition available. + Details
Name: | cfr_DepreciationAndAmortizationOfPremisesAndEquipmentYearToDate
Namespace Prefix: | cfr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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