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