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Loans - Age Analysis of Past Due Loans, Segregated by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | $ 88,933 us-gaap_FinancingReceivableRecordedInvestmentPastDue |  |
Current Loans | 11,125,880 us-gaap_FinancingReceivableRecordedInvestmentCurrent |  |
Total loans | 11,214,813 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome | 10,987,535 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome | 9,750,645 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
Accruing Loans 90 or More Days Past Due | 13,639 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing |  |
Commercial and industrial, Energy [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 5,538 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_CommercialAndIndustrialEnergyFinancingReceivableMember |  |
Current Loans | 1,813,511 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_CommercialAndIndustrialEnergyFinancingReceivableMember |  |
Total loans | 1,819,049 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_CommercialAndIndustrialEnergyFinancingReceivableMember |  |
Accruing Loans 90 or More Days Past Due | 3,902 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_CommercialAndIndustrialEnergyFinancingReceivableMember |  |
Commercial and industrial, Other commercial [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 49,116 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_CommercialAndIndustrialOtherCommercialFinancingReceivableMember |  |
Current Loans | 4,040,370 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_CommercialAndIndustrialOtherCommercialFinancingReceivableMember |  |
Total loans | 4,089,486 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_CommercialAndIndustrialOtherCommercialFinancingReceivableMember |  |
Accruing Loans 90 or More Days Past Due | 6,078 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_CommercialAndIndustrialOtherCommercialFinancingReceivableMember |  |
Commercial real estate, Buildings, land and other [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 20,410 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_CommercialRealEstateBuildingsLandAndOtherFinancingReceivableMember |  |
Current Loans | 3,368,386 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_CommercialRealEstateBuildingsLandAndOtherFinancingReceivableMember |  |
Total loans | 3,388,796 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_CommercialRealEstateBuildingsLandAndOtherFinancingReceivableMember |  |
Accruing Loans 90 or More Days Past Due | 1,278 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_CommercialRealEstateBuildingsLandAndOtherFinancingReceivableMember |  |
Construction Loans [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 1,421 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConstructionLoansMember |  |
Current Loans | 684,208 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConstructionLoansMember |  |
Total loans | 685,629 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConstructionLoansMember |  |
Accruing Loans 90 or More Days Past Due | 50 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConstructionLoansMember |  |
Consumer Real Estate [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 7,631 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember |  |
Current Loans | 844,772 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember |  |
Total loans | 852,403 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember |  |
Accruing Loans 90 or More Days Past Due | 1,662 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember |  |
Consumer and Other [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 4,817 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember |  |
Current Loans | 398,301 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember |  |
Total loans | 403,118 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember |  |
Accruing Loans 90 or More Days Past Due | 669 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember |  |
Unearned discounts [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 0 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_UnearnedDiscountsMember |  |
Current Loans | (23,668)us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_UnearnedDiscountsMember |  |
Total loans | (23,668)us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_UnearnedDiscountsMember |  |
Accruing Loans 90 or More Days Past Due | 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_UnearnedDiscountsMember |  |
Financing Receivables, 30 to 89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 49,227 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivablesPeriodPastDueAxis = cfr_FinancingReceivables30to89DaysPastDueMember |  |
Financing Receivables, 30 to 89 Days Past Due [Member] | Commercial and industrial, Energy [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 1,000 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_CommercialAndIndustrialEnergyFinancingReceivableMember / us-gaap_FinancingReceivablesPeriodPastDueAxis = cfr_FinancingReceivables30to89DaysPastDueMember |  |
Financing Receivables, 30 to 89 Days Past Due [Member] | Commercial and industrial, Other commercial [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 23,685 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_CommercialAndIndustrialOtherCommercialFinancingReceivableMember / us-gaap_FinancingReceivablesPeriodPastDueAxis = cfr_FinancingReceivables30to89DaysPastDueMember |  |
Financing Receivables, 30 to 89 Days Past Due [Member] | Commercial real estate, Buildings, land and other [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 13,405 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_CommercialRealEstateBuildingsLandAndOtherFinancingReceivableMember / us-gaap_FinancingReceivablesPeriodPastDueAxis = cfr_FinancingReceivables30to89DaysPastDueMember |  |
Financing Receivables, 30 to 89 Days Past Due [Member] | Construction Loans [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 1,371 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConstructionLoansMember / us-gaap_FinancingReceivablesPeriodPastDueAxis = cfr_FinancingReceivables30to89DaysPastDueMember |  |
Financing Receivables, 30 to 89 Days Past Due [Member] | Consumer Real Estate [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 5,670 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivablesPeriodPastDueAxis = cfr_FinancingReceivables30to89DaysPastDueMember |  |
Financing Receivables, 30 to 89 Days Past Due [Member] | Consumer and Other [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 4,096 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_FinancingReceivablesPeriodPastDueAxis = cfr_FinancingReceivables30to89DaysPastDueMember |  |
Financing Receivables, 30 to 89 Days Past Due [Member] | Unearned discounts [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 0 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_UnearnedDiscountsMember / us-gaap_FinancingReceivablesPeriodPastDueAxis = cfr_FinancingReceivables30to89DaysPastDueMember |  |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 39,706 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember |  |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial and industrial, Energy [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 4,538 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_CommercialAndIndustrialEnergyFinancingReceivableMember / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember |  |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial and industrial, Other commercial [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 25,431 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_CommercialAndIndustrialOtherCommercialFinancingReceivableMember / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember |  |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial real estate, Buildings, land and other [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 7,005 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_CommercialRealEstateBuildingsLandAndOtherFinancingReceivableMember / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember |  |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Construction Loans [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 50 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConstructionLoansMember / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember |  |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Real Estate [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 1,961 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember |  |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer and Other [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 721 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember |  |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Unearned discounts [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | $ 0 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_UnearnedDiscountsMember / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember |  |

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- Definition Recorded investment in financing receivables that are 90 days or more past due and still accruing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5111-111524 + Details
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- Definition Recorded Investment in financing receivables that are past due at the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953401-111524 + Details
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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 + Details
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