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Fair Value Measurements (Foreclosed Assets Remeasured and Reported at Fair Value) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	$ 5,300us-gaap_ForeclosedAssets	$ 11,900us-gaap_ForeclosedAssets
Foreclosed Assets Remeasured at Initial Recognition [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value of foreclosed assets prior to remeasurement	6,388cfr_CarryingValueOfForeclosedAssetsPriorToRemeasurement / us-gaap_FairValueByMeasurementBasisAxis = cfr_ForeclosedAssetRemeasuredAtInitialRecognitionMember	7,580cfr_CarryingValueOfForeclosedAssetsPriorToRemeasurement / us-gaap_FairValueByMeasurementBasisAxis = cfr_ForeclosedAssetRemeasuredAtInitialRecognitionMember	9,428cfr_CarryingValueOfForeclosedAssetsPriorToRemeasurement / us-gaap_FairValueByMeasurementBasisAxis = cfr_ForeclosedAssetRemeasuredAtInitialRecognitionMember
Charge-offs recognized in the allowance for loan losses	(285)cfr_ChargeOffsRecognizedInAllowanceForLoanLosses / us-gaap_FairValueByMeasurementBasisAxis = cfr_ForeclosedAssetRemeasuredAtInitialRecognitionMember	(710)cfr_ChargeOffsRecognizedInAllowanceForLoanLosses / us-gaap_FairValueByMeasurementBasisAxis = cfr_ForeclosedAssetRemeasuredAtInitialRecognitionMember	(1,611)cfr_ChargeOffsRecognizedInAllowanceForLoanLosses / us-gaap_FairValueByMeasurementBasisAxis = cfr_ForeclosedAssetRemeasuredAtInitialRecognitionMember
Fair value	6,103us-gaap_ForeclosedAssets / us-gaap_FairValueByMeasurementBasisAxis = cfr_ForeclosedAssetRemeasuredAtInitialRecognitionMember	6,870us-gaap_ForeclosedAssets / us-gaap_FairValueByMeasurementBasisAxis = cfr_ForeclosedAssetRemeasuredAtInitialRecognitionMember	7,817us-gaap_ForeclosedAssets / us-gaap_FairValueByMeasurementBasisAxis = cfr_ForeclosedAssetRemeasuredAtInitialRecognitionMember
Foreclosed Assets Remeasured Subsequent to Initial Recognition [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value of foreclosed assets prior to remeasurement	5,026cfr_CarryingValueOfForeclosedAssetsPriorToRemeasurement / us-gaap_FairValueByMeasurementBasisAxis = cfr_ForeclosedAssetsRemeasuredSubsequentToInitialRecognitionMember	4,979cfr_CarryingValueOfForeclosedAssetsPriorToRemeasurement / us-gaap_FairValueByMeasurementBasisAxis = cfr_ForeclosedAssetsRemeasuredSubsequentToInitialRecognitionMember	12,126cfr_CarryingValueOfForeclosedAssetsPriorToRemeasurement / us-gaap_FairValueByMeasurementBasisAxis = cfr_ForeclosedAssetsRemeasuredSubsequentToInitialRecognitionMember
Write-downs included in other non-interest expense	(1,289)cfr_WriteDownsIncludedInOtherNonInterestExpense / us-gaap_FairValueByMeasurementBasisAxis = cfr_ForeclosedAssetsRemeasuredSubsequentToInitialRecognitionMember	(895)cfr_WriteDownsIncludedInOtherNonInterestExpense / us-gaap_FairValueByMeasurementBasisAxis = cfr_ForeclosedAssetsRemeasuredSubsequentToInitialRecognitionMember	(2,093)cfr_WriteDownsIncludedInOtherNonInterestExpense / us-gaap_FairValueByMeasurementBasisAxis = cfr_ForeclosedAssetsRemeasuredSubsequentToInitialRecognitionMember
Fair value	$ 3,737us-gaap_ForeclosedAssets / us-gaap_FairValueByMeasurementBasisAxis = cfr_ForeclosedAssetsRemeasuredSubsequentToInitialRecognitionMember	$ 4,084us-gaap_ForeclosedAssets / us-gaap_FairValueByMeasurementBasisAxis = cfr_ForeclosedAssetsRemeasuredSubsequentToInitialRecognitionMember	$ 10,033us-gaap_ForeclosedAssets / us-gaap_FairValueByMeasurementBasisAxis = cfr_ForeclosedAssetsRemeasuredSubsequentToInitialRecognitionMember

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- Definition

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- Definition

Carrying amount as of the balance sheet date of all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings or defeasance; includes real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4437-111522

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