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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
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | $ 5,300 us-gaap_ForeclosedAssets | $ 11,900 us-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 | 6,388 cfr_CarryingValueOfForeclosedAssetsPriorToRemeasurement / us-gaap_FairValueByMeasurementBasisAxis = cfr_ForeclosedAssetRemeasuredAtInitialRecognitionMember | 7,580 cfr_CarryingValueOfForeclosedAssetsPriorToRemeasurement / us-gaap_FairValueByMeasurementBasisAxis = cfr_ForeclosedAssetRemeasuredAtInitialRecognitionMember | 9,428 cfr_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 | 6,103 us-gaap_ForeclosedAssets / us-gaap_FairValueByMeasurementBasisAxis = cfr_ForeclosedAssetRemeasuredAtInitialRecognitionMember | 6,870 us-gaap_ForeclosedAssets / us-gaap_FairValueByMeasurementBasisAxis = cfr_ForeclosedAssetRemeasuredAtInitialRecognitionMember | 7,817 us-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 | 5,026 cfr_CarryingValueOfForeclosedAssetsPriorToRemeasurement / us-gaap_FairValueByMeasurementBasisAxis = cfr_ForeclosedAssetsRemeasuredSubsequentToInitialRecognitionMember | 4,979 cfr_CarryingValueOfForeclosedAssetsPriorToRemeasurement / us-gaap_FairValueByMeasurementBasisAxis = cfr_ForeclosedAssetsRemeasuredSubsequentToInitialRecognitionMember | 12,126 cfr_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 | $ 3,737 us-gaap_ForeclosedAssets / us-gaap_FairValueByMeasurementBasisAxis = cfr_ForeclosedAssetsRemeasuredSubsequentToInitialRecognitionMember | $ 4,084 us-gaap_ForeclosedAssets / us-gaap_FairValueByMeasurementBasisAxis = cfr_ForeclosedAssetsRemeasuredSubsequentToInitialRecognitionMember | $ 10,033 us-gaap_ForeclosedAssets / us-gaap_FairValueByMeasurementBasisAxis = cfr_ForeclosedAssetsRemeasuredSubsequentToInitialRecognitionMember

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- Definition Carrying Value Of Foreclosed Assets Prior To Remeasurement + References No definition available. + Details
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- Definition Charge Offs Recognized In Allowance For Loan Losses + References No definition available. + Details
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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 + Details
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