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Borrowed Funds (Narrative) (Detail) (USD $) | 12 Months Ended | 1 Months Ended
--- | --- | ---
Dec. 31, 2014 quarter | Dec. 31, 2013 | Dec. 31, 2004 | Feb. 28, 2007
Borrowed Funds [Line Items] |  |  |  |
Federal funds purchased | $ 12,000,000 us-gaap_FederalFundsPurchased | $ 200,000 us-gaap_FederalFundsPurchased |  |
Securities sold under agreements to repurchase | 791,100,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase | 668,100,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase |  |
Maximum number of quarterly periods by which the corporation has the right to defer interest payments on junior subordinated deferrable interest debentures | 20 cfr_Maximumnumberofquarterlyperiodsbywhichthecorporationhastherighttodeferinterestpaymentsonjuniorsubordinateddeferrableinterestdebentures |  |  |
Junior subordinated deferrable interest debentures | 137,115,000 us-gaap_JuniorSubordinatedNotes | 123,712,000 us-gaap_JuniorSubordinatedNotes |  |
Common equity securities |  | 144,486,000 us-gaap_StockIssuedDuringPeriodValueNewIssues |  |
Maximum allowable percentage of core capital included in Tier 1 Capital by Most Bank Holding Companies | 25.00%cfr_MaximumAllowablePercentageOfCoreCapitalIncludedInTierOneCapitalByMostBankHoldingCompanies |  |  |
Proceeds from Issuance of Trust Preferred Securities | 133,000,000 us-gaap_ProceedsFromIssuanceOfTrustPreferredSecurities | 120,000,000 us-gaap_ProceedsFromIssuanceOfTrustPreferredSecurities |  |
Trust II [Member] |  |  |  |
Borrowed Funds [Line Items] |  |  |  |
Advances, variable-rate | 1.78%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = cfr_CullenFrostCapitalTrustIIMember | 1.79%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = cfr_CullenFrostCapitalTrustIIMember | 1.55%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = cfr_CullenFrostCapitalTrustIIMember |
LIBOR plus margin |  |  | Three-month LIBOR plus a margin of 1.55% |
Trust preferred securities, issued |  |  | 120,000,000 cfr_TrustPreferredSecuritiesIssued / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = cfr_CullenFrostCapitalTrustIIMember |
Maturity date of trust preferred securities | March 1, 2034 |  |  |
WNB Capital Trust I [Member] |  |  |  |
Borrowed Funds [Line Items] |  |  |  |
Advances, variable-rate | 2.58%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = cfr_WNBCapitalTrustIMember |  | 2.35%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = cfr_WNBCapitalTrustIMember |
Trust preferred securities, issued |  |  | 13,000,000 cfr_TrustPreferredSecuritiesIssued / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = cfr_WNBCapitalTrustIMember |
Maturity date of trust preferred securities | July 23, 2034 |  |  |
Federal Funds Purchased [Member] | Minimum [Member] |  |  |  |
Borrowed Funds [Line Items] |  |  |  |
Short term debt maturity period | 1 day |  |  |
Federal Funds Purchased [Member] | Maximum [Member] |  |  |  |
Borrowed Funds [Line Items] |  |  |  |
Short term debt maturity period | 90 days |  |  |
Securities Sold under Agreements to Repurchase [Member] | Minimum [Member] |  |  |  |
Borrowed Funds [Line Items] |  |  |  |
Short term debt maturity period | 30 days |  |  |
Securities Sold under Agreements to Repurchase [Member] | Maximum [Member] |  |  |  |
Borrowed Funds [Line Items] |  |  |  |
Short term debt maturity period | 90 days |  |  |
Subordinated Notes Payable [Member] |  |  |  |
Borrowed Funds [Line Items] |  |  |  |
Subordinated Notes |  |  |  | 100,000,000 us-gaap_SubordinatedDebt / us-gaap_LongtermDebtTypeAxis = cfr_SubordinatedNotesPayableMember
Subordinated Notes interest rate |  |  |  | 5.75%us-gaap_SubordinatedBorrowingInterestRate / us-gaap_LongtermDebtTypeAxis = cfr_SubordinatedNotesPayableMember
Maturity date |  |  |  | Feb. 15, 2017
Advances, variable-rate | 0.76%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_LongtermDebtTypeAxis = cfr_SubordinatedNotesPayableMember | 0.77%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_LongtermDebtTypeAxis = cfr_SubordinatedNotesPayableMember |  | 0.53%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_LongtermDebtTypeAxis = cfr_SubordinatedNotesPayableMember
LIBOR plus margin |  |  |  | Three-month LIBOR for the related interest period plus 0.53%
Percentage of redemption price | 100.00%cfr_PercentageOfRedemptionPriceNotesPayable / us-gaap_LongtermDebtTypeAxis = cfr_SubordinatedNotesPayableMember |  |  |
Unamortized debt issuance cost related to note | 250,000 us-gaap_UnamortizedDebtIssuanceExpense / us-gaap_LongtermDebtTypeAxis = cfr_SubordinatedNotesPayableMember | 370,000 us-gaap_UnamortizedDebtIssuanceExpense / us-gaap_LongtermDebtTypeAxis = cfr_SubordinatedNotesPayableMember |  |
Junior Subordinated Deferrable Interest Debenture [Member] | Trust II [Member] |  |  |  |
Borrowed Funds [Line Items] |  |  |  |
Unamortized debt issuance cost related to note | 1,100,000 us-gaap_UnamortizedDebtIssuanceExpense / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = cfr_CullenFrostCapitalTrustIIMember | 1,200,000 us-gaap_UnamortizedDebtIssuanceExpense / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = cfr_CullenFrostCapitalTrustIIMember |  |
Junior subordinated deferrable interest debentures | 123,712,000.000 us-gaap_JuniorSubordinatedNotes / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = cfr_CullenFrostCapitalTrustIIMember | 123,712,000 us-gaap_JuniorSubordinatedNotes / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = cfr_CullenFrostCapitalTrustIIMember |  |
Common equity securities | 3,700,000.0 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = cfr_CullenFrostCapitalTrustIIMember |  |  |
Junior Subordinated Deferrable Interest Debenture [Member] | WNB Capital Trust I [Member] |  |  |  |
Borrowed Funds [Line Items] |  |  |  |
Junior subordinated deferrable interest debentures | 13,403,000.000 us-gaap_JuniorSubordinatedNotes / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = cfr_WNBCapitalTrustIMember |  |  |
Common equity securities | $ 403,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = cfr_WNBCapitalTrustIMember |  |  |

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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 10 -Section F Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Article 5 -Subsection 19, 20, 22 + Details
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