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Loans - Loans (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 mortgages | 3,095,830 us-gaap_LoansReceivableCommercialMortgage | 3,080,202 us-gaap_LoansReceivableCommercialMortgage |
Construction | 685,629 us-gaap_LoansReceivableCommercialConstruction | 629,988 us-gaap_LoansReceivableCommercialConstruction |
Land | 292,966 cfr_LoansReceivableCommercialRealEstateLand | 291,907 cfr_LoansReceivableCommercialRealEstateLand |
Total commercial real estate | 4,074,425 us-gaap_LoansReceivableCommercialRealEstate | 4,002,097 us-gaap_LoansReceivableCommercialRealEstate | 3,496,139 us-gaap_LoansReceivableCommercialRealEstate
Home equity loans | 338,732 us-gaap_LoansAndLeasesReceivableConsumerHomeEquity | 342,725 us-gaap_LoansAndLeasesReceivableConsumerHomeEquity |
Home equity lines of credit | 222,967 cfr_LoansAndLeasesReceivableConsumerHomeEquityLinesOfCredit | 220,128 cfr_LoansAndLeasesReceivableConsumerHomeEquityLinesOfCredit |
Other | 290,704 us-gaap_LoansAndLeasesReceivableConsumerOther | 286,198 us-gaap_LoansAndLeasesReceivableConsumerOther |
Total consumer real estate | 852,403 us-gaap_LoansAndLeasesReceivableConsumerRealEstate | 849,051 us-gaap_LoansAndLeasesReceivableConsumerRealEstate | 818,997 us-gaap_LoansAndLeasesReceivableConsumerRealEstate
Total real estate | 4,926,828 cfr_LoansAndLeasesReceivableRealEstate | 4,851,148 cfr_LoansAndLeasesReceivableRealEstate |
Consumer installment | 395,879 us-gaap_LoansAndLeasesReceivableConsumerInstallmentAndRevolving | 385,479 us-gaap_LoansAndLeasesReceivableConsumerInstallmentAndRevolving |
Other | 7,239 us-gaap_LoansAndLeasesReceivableOther | 8,122 us-gaap_LoansAndLeasesReceivableOther |
Total 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
Total commercial and industrial percentage of total loans | 52.70%cfr_PercentageOfCommercialAndIndustrialLoansToLoans | 52.50%cfr_PercentageOfCommercialAndIndustrialLoansToLoans |
Commercial mortgages percentage of total loans | 27.60%cfr_PercentageOfCommercialRealEstateMortgageLoansToLoans | 28.00%cfr_PercentageOfCommercialRealEstateMortgageLoansToLoans |
Construction percentage of total loans | 6.10%cfr_PercentageOfCommercialRealEstateConstructionLoansToLoans | 5.70%cfr_PercentageOfCommercialRealEstateConstructionLoansToLoans |
Land percentage of total loans | 2.60%cfr_PercentageOfCommercialRealEstateLandLoansToLoans | 2.70%cfr_PercentageOfCommercialRealEstateLandLoansToLoans |
Total commercial real estate percentage of total loans | 36.30%cfr_PercentageOfCommercialRealEstateLoanToLoans | 36.40%cfr_PercentageOfCommercialRealEstateLoanToLoans |
Home equity loans percentage of total loans | 3.00%cfr_PercentageOfConsumerHomeEquityLoansToLoans | 3.10%cfr_PercentageOfConsumerHomeEquityLoansToLoans |
Home equity lines of credit percentage of total loans | 2.00%cfr_PercentageOfConsumerRealEstateHomeEquityLinesOfCreditToLoans | 2.00%cfr_PercentageOfConsumerRealEstateHomeEquityLinesOfCreditToLoans |
Other percentage of total loans | 2.60%cfr_PercentageOfOtherConsumerRealEstateLoansToLoans | 2.60%cfr_PercentageOfOtherConsumerRealEstateLoansToLoans |
Total consumer real estate percentage of total loans | 7.60%cfr_PercentageOfLoansAndLeasesReceivableConsumerRealEstateToLoans | 7.70%cfr_PercentageOfLoansAndLeasesReceivableConsumerRealEstateToLoans |
Total real estate percentage of total loans | 43.90%cfr_PercentageOfRealEstateLoansToLoans | 44.10%cfr_PercentageOfRealEstateLoansToLoans |
Consumer installment percentage of total loans | 3.50%cfr_PercentageOfConsumerInstallmentLoansToLoans | 3.50%cfr_PercentageOfConsumerInstallmentLoansToLoans |
Other percentage of total loans | 0.10%cfr_PercentageOfOtherConsumerLoansToLoans | 0.10%cfr_PercentageOfOtherConsumerLoansToLoans |
Total consumer and other percentage of total loans | 3.60%cfr_PercentageOfLoansAndLeasesReceivableConsumerOtherToLoans | 3.60%cfr_PercentageOfLoansAndLeasesReceivableConsumerOtherToLoans |
Unearned discounts percentage of total loans | (0.20%)cfr_PercentageOfUnearnedDiscountsToLoans | (0.20%)cfr_PercentageOfUnearnedDiscountsToLoans |
Total loans percentage | 100.00%cfr_PercentageOfLoansToLoans | 100.00%cfr_PercentageOfLoansToLoans |
Commercial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and industrial: | 5,582,282 us-gaap_LoansReceivableCommercialAndIndustrial / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember | 5,429,206 us-gaap_LoansReceivableCommercialAndIndustrial / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember |
Total commercial and industrial percentage of total loans | 49.80%cfr_PercentageOfCommercialAndIndustrialLoansToLoans / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember | 49.40%cfr_PercentageOfCommercialAndIndustrialLoansToLoans / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember |
Leases [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and industrial: | $ 326,253 us-gaap_LoansReceivableCommercialAndIndustrial / us-gaap_FinancialInstrumentAxis = us-gaap_FinanceLeasesPortfolioSegmentMember | $ 338,537 us-gaap_LoansReceivableCommercialAndIndustrial / us-gaap_FinancialInstrumentAxis = us-gaap_FinanceLeasesPortfolioSegmentMember |
Total commercial and industrial percentage of total loans | 2.90%cfr_PercentageOfCommercialAndIndustrialLoansToLoans / us-gaap_FinancialInstrumentAxis = us-gaap_FinanceLeasesPortfolioSegmentMember | 3.10%cfr_PercentageOfCommercialAndIndustrialLoansToLoans / us-gaap_FinancialInstrumentAxis = us-gaap_FinanceLeasesPortfolioSegmentMember |

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- Definition Amount before allowance of revolving, open-end loan, extended under a line of credit and secured by the borrower's residential property. 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)(3),(b)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount before allowance of installment and revolving loans issued to individuals, including, but not limited to credit card, automobile, boat, student, durable home appliance 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 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 loans and leases not otherwise specified in the taxonomy. 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)(7),(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 other loans and leases not otherwise specified in the taxonomy. 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)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount before allowance of commercial construction loans. 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)(2)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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