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Loans - Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Commercial and industrial: $ 5,908,535us-gaap_LoansReceivableCommercialAndIndustrial $ 5,767,743us-gaap_LoansReceivableCommercialAndIndustrial $ 5,106,726us-gaap_LoansReceivableCommercialAndIndustrial
Commercial mortgages 3,095,830us-gaap_LoansReceivableCommercialMortgage 3,080,202us-gaap_LoansReceivableCommercialMortgage  
Construction 685,629us-gaap_LoansReceivableCommercialConstruction 629,988us-gaap_LoansReceivableCommercialConstruction  
Land 292,966cfr_LoansReceivableCommercialRealEstateLand 291,907cfr_LoansReceivableCommercialRealEstateLand  
Total commercial real estate 4,074,425us-gaap_LoansReceivableCommercialRealEstate 4,002,097us-gaap_LoansReceivableCommercialRealEstate 3,496,139us-gaap_LoansReceivableCommercialRealEstate
Home equity loans 338,732us-gaap_LoansAndLeasesReceivableConsumerHomeEquity 342,725us-gaap_LoansAndLeasesReceivableConsumerHomeEquity  
Home equity lines of credit 222,967cfr_LoansAndLeasesReceivableConsumerHomeEquityLinesOfCredit 220,128cfr_LoansAndLeasesReceivableConsumerHomeEquityLinesOfCredit  
Other 290,704us-gaap_LoansAndLeasesReceivableConsumerOther 286,198us-gaap_LoansAndLeasesReceivableConsumerOther  
Total consumer real estate 852,403us-gaap_LoansAndLeasesReceivableConsumerRealEstate 849,051us-gaap_LoansAndLeasesReceivableConsumerRealEstate 818,997us-gaap_LoansAndLeasesReceivableConsumerRealEstate
Total real estate 4,926,828cfr_LoansAndLeasesReceivableRealEstate 4,851,148cfr_LoansAndLeasesReceivableRealEstate  
Consumer installment 395,879us-gaap_LoansAndLeasesReceivableConsumerInstallmentAndRevolving 385,479us-gaap_LoansAndLeasesReceivableConsumerInstallmentAndRevolving  
Other 7,239us-gaap_LoansAndLeasesReceivableOther 8,122us-gaap_LoansAndLeasesReceivableOther  
Total consumer and other 403,118us-gaap_LoansAndLeasesReceivableConsumerInstallmentOther 393,601us-gaap_LoansAndLeasesReceivableConsumerInstallmentOther 352,320us-gaap_LoansAndLeasesReceivableConsumerInstallmentOther
Unearned discounts (23,668)us-gaap_LoansAndLeasesReceivableDeferredIncome (24,957)us-gaap_LoansAndLeasesReceivableDeferredIncome (23,537)us-gaap_LoansAndLeasesReceivableDeferredIncome
Total loans 11,214,813us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome 10,987,535us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome 9,750,645us-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: 5,582,282us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
5,429,206us-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: $ 326,253us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FinanceLeasesPortfolioSegmentMember
$ 338,537us-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