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Loans - Additional Information (Detail) (USD $) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2015 Item | Mar. 31, 2014 | Feb. 28, 2015 | Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Maximum loan-to-value percentage on home equity loans | 80.00%cfr_MaximumLoanToValuePercentageOnHomeEquityLoans |  |  |
Concentration of loans in a single industry in excess of ten percent | 0.00%cfr_Concentrationofloansinasingleindustryinexcessoftenpercent |  |  |
Maximum percentage loan related to single industry | 10.00%cfr_MaximumPercentageOfLoanRelatedToSingleIndustry |  |  |
Minimum number of days to be considered past due | 90 days |  |  |
Troubled debt restructurings | $ 613,000 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 | $ 793,000 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 |  |
Previously restructured loans past due | 0 cfr_PreviouslyRestructuredLoansPastDue |  |  |
Financing receivable, modifications, pre-modification recorded investment | 709,000 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 | 819,000 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 |  |
Number of days past due for payment of interest on loans, minimum | 120 days |  |  |
Number of loans with calculated risk of 10 or higher greater than $5 million | 3 cfr_NumberOfLoansWithCalculatedRiskOfTenOrHigher |  |  |
Loan amount threshold | 5,000,000 cfr_LoanAmountThreshold |  |  |
Loan value with weighted-average loan-to-value | 33,200,000 cfr_LoanValueWithWeightedAverageLoanToValue |  |  |
Weighted-average loan-to-value ratio | 64.20%cfr_WeightedAverageLoanToValueRatioPercentage |  |  |
Texas Leading Index economic condition indicator |  |  | 126.9 cfr_TexasLeadingIndexEconomicConditionIndicator | 129.4 cfr_TexasLeadingIndexEconomicConditionIndicator
Maximum origination value of loans which were subject to further refinement of valuation methodology | 1,000,000 cfr_MaximumOriginationValueOfLoansWhichWereSubjectToFurtherRefinementOfValuationMethodology |  |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percentage of owner-occupied commercial real estate loans | 54.00%cfr_PercentageOfOwnerOccupiedCommercialRealEstateLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |  |  |
Commercial and industrial, Energy [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percentage of loans related to a single industry | 16.20%cfr_Percentageofloansrelatedtoasingleindustry / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_CommercialAndIndustrialEnergyFinancingReceivableMember |  |  |
Troubled debt restructurings | 0 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_CommercialAndIndustrialEnergyFinancingReceivableMember | 0 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_CommercialAndIndustrialEnergyFinancingReceivableMember |  |
Financing receivable, modifications, pre-modification recorded investment | 0 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_CommercialAndIndustrialEnergyFinancingReceivableMember | 0 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_CommercialAndIndustrialEnergyFinancingReceivableMember |  |
Non-Accrual Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Additional interest that would have been recognized on non-accrual loans, net of tax | 397,000 us-gaap_LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_NonAccrualLoansMember | 358,000 us-gaap_LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_NonAccrualLoansMember |  |
Commercial Portfolio Segment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivables, impaired, troubled debt restructuring, write-down | 88,000 us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember |  |  |
Financing receivable, modifications, pre-modification recorded investment | 314,000 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember |  |  |
Number of days past due for payment of interest on loans, minimum | 180 days |  |  |
Grade 12 [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of days past due for payment of interest on loans, minimum | 120 days |  |  |
General percentage of valuation allowance in excess of principal balance, maximum | 30.00%cfr_PercentOfValuationAllowanceInExcessOfPrincipalBalanceMaximum / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_GradeTwelveMember |  |  |
Grade 13 [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
General percentage of valuation allowance in excess of principal balance, minimum | 30.00%cfr_PercentOfValuationAllowanceInExcessOfPrincipalBalanceMinimum / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_GradeThirteenMember |  |  |
Commercial real estate, Buildings, land and other [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Previously Restructured Loans Moved to OREO | 500,000 cfr_PreviouslyRestructuredLoansMovedtoOREO / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_CommercialRealEstateBuildingsLandAndOtherFinancingReceivableMember |  |  |
Charge-off of previously restructures loans | $ 0 cfr_ChargeOffOfPreviouslyRestructuresLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_CommercialRealEstateBuildingsLandAndOtherFinancingReceivableMember |  |  |

X
- Definition Charge Off Of Previously Restructures Loans + References No definition available. + Details
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- Definition Concentration of loans in a single industry in excess of ten percent + References No definition available. + Details
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- Definition Loan Amount Threshold + References No definition available. + Details
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- Definition Loan Value With Weighted-Average Loan-To-Value + References No definition available. + Details
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- Definition Maximum Loan To Value Percentage On Home Equity Loans + References No definition available. + Details
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- Definition Maximum origination value of loans which were subject to further refinement of valuation methodology. + References No definition available. + Details
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- Definition Maximum Percentage of Loan Related To Single Industry + References No definition available. + Details
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- Definition Minimum Number Of Days To Be Considered Past Due + References No definition available. + Details
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- Definition Number Of Days Past Due + References No definition available. + Details
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- Definition Number Of Loans With Calculated Risk Of Ten Or Higher + References No definition available. + Details
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- Definition Percentage of loans related to a single industry + References No definition available. + Details
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- Definition Percentage Of Owner Occupied Commercial Real Estate Loans + References No definition available. + Details
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Data Type: | num:percentItemType
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- Definition Percent Of Valuation Allowance In Excess Of Principal Balance Maximum + References No definition available. + Details
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- Definition Percent Of Valuation Allowance In Excess Of Principal Balance Minimum + References No definition available. + Details
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- Definition Previously Restructured Loans Moved to OREO + References No definition available. + Details
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- Definition Previously Restructured Loans Past Due + References No definition available. + Details
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- Definition Texas Leading Index economic condition indicator + References No definition available. + Details
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- Definition Weighted Average Loan To Value Ratio Percentage + References No definition available. + Details
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Namespace Prefix: | cfr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
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- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953676-111524 + Details
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- Definition Pre-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953676-111524 + Details
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- Definition Reflects the amount of the write-down related to a troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554 + Details
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- Definition Reflects the amount of additional interest income that would have been recorded if impaired or nonperforming loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18794-111554 + Details
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