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Loans - Net (Charge-Offs)/Recoveries, Segregated by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
(Net charge-offs)/Recoveries | $ (1,996)us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet | $ (3,882)us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet
Commercial and industrial, Energy [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
(Net charge-offs)/Recoveries | 2 us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_CommercialAndIndustrialEnergyFinancingReceivableMember | (13)us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_CommercialAndIndustrialEnergyFinancingReceivableMember
Commercial and industrial, Other commercial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
(Net charge-offs)/Recoveries | (852)us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_CommercialAndIndustrialOtherCommercialFinancingReceivableMember | (1,683)us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_CommercialAndIndustrialOtherCommercialFinancingReceivableMember
Commercial real estate, Buildings, land and other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
(Net charge-offs)/Recoveries | (307)us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_CommercialRealEstateBuildingsLandAndOtherFinancingReceivableMember | (1,618)us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_CommercialRealEstateBuildingsLandAndOtherFinancingReceivableMember
Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
(Net charge-offs)/Recoveries | 1 us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConstructionLoansMember | 40 us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConstructionLoansMember
Consumer Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
(Net charge-offs)/Recoveries | (28)us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember | 23 us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember
Consumer and Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
(Net charge-offs)/Recoveries | $ (812)us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember | $ (631)us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember

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- Definition Amount of other addition (reduction) in allowance reserve for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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