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v2.4.1.9

Loans - Investment in Loans Related to Allowance for Loan Losses by Portfolio Segment Disaggregated Based on Impairment Methodology (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and industrial: | $ 5,908,535 us-gaap_LoansReceivableCommercialAndIndustrial | $ 5,767,743 us-gaap_LoansReceivableCommercialAndIndustrial | $ 5,106,726 us-gaap_LoansReceivableCommercialAndIndustrial
Commercial Real Estate | 4,074,425 us-gaap_LoansReceivableCommercialRealEstate | 4,002,097 us-gaap_LoansReceivableCommercialRealEstate | 3,496,139 us-gaap_LoansReceivableCommercialRealEstate
Consumer Real Estate | 852,403 us-gaap_LoansAndLeasesReceivableConsumerRealEstate | 849,051 us-gaap_LoansAndLeasesReceivableConsumerRealEstate | 818,997 us-gaap_LoansAndLeasesReceivableConsumerRealEstate
Consumer and Other | 403,118 us-gaap_LoansAndLeasesReceivableConsumerInstallmentOther | 393,601 us-gaap_LoansAndLeasesReceivableConsumerInstallmentOther | 352,320 us-gaap_LoansAndLeasesReceivableConsumerInstallmentOther
Unearned discounts | (23,668)us-gaap_LoansAndLeasesReceivableDeferredIncome | (24,957)us-gaap_LoansAndLeasesReceivableDeferredIncome | (23,537)us-gaap_LoansAndLeasesReceivableDeferredIncome
Total loans | 11,214,813 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome | 10,987,535 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome | 9,750,645 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
Loans Individually Evaluated for Impairment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and industrial: | 31,631 us-gaap_LoansReceivableCommercialAndIndustrial / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansIndividuallyEvaluatedForImpairmentMember | 32,496 us-gaap_LoansReceivableCommercialAndIndustrial / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansIndividuallyEvaluatedForImpairmentMember | 19,917 us-gaap_LoansReceivableCommercialAndIndustrial / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansIndividuallyEvaluatedForImpairmentMember
Commercial Real Estate | 17,660 us-gaap_LoansReceivableCommercialRealEstate / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansIndividuallyEvaluatedForImpairmentMember | 20,499 us-gaap_LoansReceivableCommercialRealEstate / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansIndividuallyEvaluatedForImpairmentMember | 21,340 us-gaap_LoansReceivableCommercialRealEstate / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansIndividuallyEvaluatedForImpairmentMember
Consumer Real Estate | 568 us-gaap_LoansAndLeasesReceivableConsumerRealEstate / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansIndividuallyEvaluatedForImpairmentMember | 596 us-gaap_LoansAndLeasesReceivableConsumerRealEstate / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansIndividuallyEvaluatedForImpairmentMember | 718 us-gaap_LoansAndLeasesReceivableConsumerRealEstate / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansIndividuallyEvaluatedForImpairmentMember
Consumer and Other | 0 us-gaap_LoansAndLeasesReceivableConsumerInstallmentOther / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansIndividuallyEvaluatedForImpairmentMember | 0 us-gaap_LoansAndLeasesReceivableConsumerInstallmentOther / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansIndividuallyEvaluatedForImpairmentMember | 264 us-gaap_LoansAndLeasesReceivableConsumerInstallmentOther / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansIndividuallyEvaluatedForImpairmentMember
Unearned discounts | 0 us-gaap_LoansAndLeasesReceivableDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansIndividuallyEvaluatedForImpairmentMember | 0 us-gaap_LoansAndLeasesReceivableDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansIndividuallyEvaluatedForImpairmentMember | 0 us-gaap_LoansAndLeasesReceivableDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansIndividuallyEvaluatedForImpairmentMember
Total loans | 49,859 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansIndividuallyEvaluatedForImpairmentMember | 53,591 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansIndividuallyEvaluatedForImpairmentMember | 42,239 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansIndividuallyEvaluatedForImpairmentMember
Loans Collectively Evaluated for Impairment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and industrial: | 5,876,904 us-gaap_LoansReceivableCommercialAndIndustrial / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansCollectivelyEvaluatedForImpairmentMember | 5,735,247 us-gaap_LoansReceivableCommercialAndIndustrial / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansCollectivelyEvaluatedForImpairmentMember | 5,086,809 us-gaap_LoansReceivableCommercialAndIndustrial / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansCollectivelyEvaluatedForImpairmentMember
Commercial Real Estate | 4,056,765 us-gaap_LoansReceivableCommercialRealEstate / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansCollectivelyEvaluatedForImpairmentMember | 3,981,598 us-gaap_LoansReceivableCommercialRealEstate / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansCollectivelyEvaluatedForImpairmentMember | 3,474,799 us-gaap_LoansReceivableCommercialRealEstate / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansCollectivelyEvaluatedForImpairmentMember
Consumer Real Estate | 851,835 us-gaap_LoansAndLeasesReceivableConsumerRealEstate / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansCollectivelyEvaluatedForImpairmentMember | 848,455 us-gaap_LoansAndLeasesReceivableConsumerRealEstate / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansCollectivelyEvaluatedForImpairmentMember | 818,279 us-gaap_LoansAndLeasesReceivableConsumerRealEstate / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansCollectivelyEvaluatedForImpairmentMember
Consumer and Other | 403,118 us-gaap_LoansAndLeasesReceivableConsumerInstallmentOther / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansCollectivelyEvaluatedForImpairmentMember | 393,601 us-gaap_LoansAndLeasesReceivableConsumerInstallmentOther / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansCollectivelyEvaluatedForImpairmentMember | 352,056 us-gaap_LoansAndLeasesReceivableConsumerInstallmentOther / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansCollectivelyEvaluatedForImpairmentMember
Unearned discounts | (23,668)us-gaap_LoansAndLeasesReceivableDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansCollectivelyEvaluatedForImpairmentMember | (24,957)us-gaap_LoansAndLeasesReceivableDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansCollectivelyEvaluatedForImpairmentMember | (23,537)us-gaap_LoansAndLeasesReceivableDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansCollectivelyEvaluatedForImpairmentMember
Total loans | $ 11,164,954 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansCollectivelyEvaluatedForImpairmentMember | $ 10,933,944 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansCollectivelyEvaluatedForImpairmentMember | $ 9,708,406 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfr_LoansCollectivelyEvaluatedForImpairmentMember

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- Definition Amount before allowance of other consumer installment loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. 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 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 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(a)(4),(b)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount before allowance of consumer real estate loans. Includes, but not limited to, construction financing, residential mortgage loans, and home equity lines of credit. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. 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 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 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(a)(2),(3),(b)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for 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 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6378556&loc=d3e10152-111534 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=25496975&loc=d3e45377-112738 Reference 4: 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) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + 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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- Definition Amount before allowance of loans issued to commercial and industrial institutions. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes real estate loans and loans 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 3 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5066-111524 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount before allowance of commercial loans issued to businesses to acquire, develop, construct, improve, or refinance land or building. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans 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 3 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5066-111524 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(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 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 210.7-03.1(c)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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