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Deposits - Schedule of Deposits (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Deposit [Line Items]    
Total non-interest-bearing demand deposits $ 10,031,950us-gaap_NoninterestBearingDepositLiabilities $ 10,149,061us-gaap_NoninterestBearingDepositLiabilities
Total interest-bearing deposits 14,117,672us-gaap_InterestBearingDepositLiabilities 13,986,869us-gaap_InterestBearingDepositLiabilities
Total deposits 24,149,622us-gaap_Deposits 24,135,930us-gaap_Deposits
Total non-interest-bearing demand deposits, Percentage of Total 41.50%cfr_PercentageOfNonInterestBearingDemandDepositsToDeposits 42.00%cfr_PercentageOfNonInterestBearingDemandDepositsToDeposits
Total interest-bearing deposits, Percentage of Total 58.50%us-gaap_PercentageOfInterestBearingDomesticDepositsToDeposits 58.00%us-gaap_PercentageOfInterestBearingDomesticDepositsToDeposits
Total deposits, Percentage of Total 100.00%cfr_DepositsPercentage 100.00%cfr_DepositsPercentage
Commercial and Individual [Member]    
Deposit [Line Items]    
Total non-interest-bearing demand deposits 9,186,477us-gaap_NoninterestBearingDepositLiabilities
/ us-gaap_DebtInstrumentAxis
= cfr_CommercialAndIndividualMember
9,256,045us-gaap_NoninterestBearingDepositLiabilities
/ us-gaap_DebtInstrumentAxis
= cfr_CommercialAndIndividualMember
Total non-interest-bearing demand deposits, Percentage of Total 38.00%cfr_PercentageOfNonInterestBearingDemandDepositsToDeposits
/ us-gaap_DebtInstrumentAxis
= cfr_CommercialAndIndividualMember
38.30%cfr_PercentageOfNonInterestBearingDemandDepositsToDeposits
/ us-gaap_DebtInstrumentAxis
= cfr_CommercialAndIndividualMember
Correspondent Banks [Member]    
Deposit [Line Items]    
Total non-interest-bearing demand deposits 367,977us-gaap_NoninterestBearingDepositLiabilities
/ us-gaap_DebtInstrumentAxis
= cfr_CorrespondentBanksMember
429,000us-gaap_NoninterestBearingDepositLiabilities
/ us-gaap_DebtInstrumentAxis
= cfr_CorrespondentBanksMember
Total non-interest-bearing demand deposits, Percentage of Total 1.50%cfr_PercentageOfNonInterestBearingDemandDepositsToDeposits
/ us-gaap_DebtInstrumentAxis
= cfr_CorrespondentBanksMember
1.80%cfr_PercentageOfNonInterestBearingDemandDepositsToDeposits
/ us-gaap_DebtInstrumentAxis
= cfr_CorrespondentBanksMember
Private Accounts [Member]    
Deposit [Line Items]    
Savings and interest checking 4,917,918us-gaap_DepositsSavingsDeposits
/ us-gaap_DebtInstrumentAxis
= cfr_PrivateAccountsMember
4,743,963us-gaap_DepositsSavingsDeposits
/ us-gaap_DebtInstrumentAxis
= cfr_PrivateAccountsMember
Money market accounts 7,889,909us-gaap_DepositsMoneyMarketDeposits
/ us-gaap_DebtInstrumentAxis
= cfr_PrivateAccountsMember
7,860,403us-gaap_DepositsMoneyMarketDeposits
/ us-gaap_DebtInstrumentAxis
= cfr_PrivateAccountsMember
Time accounts of $100,000 or more 480,604us-gaap_TimeDeposits100000OrMoreDomestic
/ us-gaap_DebtInstrumentAxis
= cfr_PrivateAccountsMember
490,209us-gaap_TimeDeposits100000OrMoreDomestic
/ us-gaap_DebtInstrumentAxis
= cfr_PrivateAccountsMember
Time accounts under $100,000 429,845us-gaap_TimeDepositsLessThan100000
/ us-gaap_DebtInstrumentAxis
= cfr_PrivateAccountsMember
454,220us-gaap_TimeDepositsLessThan100000
/ us-gaap_DebtInstrumentAxis
= cfr_PrivateAccountsMember
Total private accounts 13,718,276cfr_InterestBearingPrivateAccountsDeposits
/ us-gaap_DebtInstrumentAxis
= cfr_PrivateAccountsMember
13,548,795cfr_InterestBearingPrivateAccountsDeposits
/ us-gaap_DebtInstrumentAxis
= cfr_PrivateAccountsMember
Savings and interest checking, Percentage of Total 20.30%us-gaap_PercentageOfInterestBearingDomesticDepositsToDepositsSavings
/ us-gaap_DebtInstrumentAxis
= cfr_PrivateAccountsMember
19.70%us-gaap_PercentageOfInterestBearingDomesticDepositsToDepositsSavings
/ us-gaap_DebtInstrumentAxis
= cfr_PrivateAccountsMember
Money market accounts, Percentage of Total 32.70%us-gaap_PercentageOfInterestBearingDomesticDepositsToDepositsMoneyMarket
/ us-gaap_DebtInstrumentAxis
= cfr_PrivateAccountsMember
32.60%us-gaap_PercentageOfInterestBearingDomesticDepositsToDepositsMoneyMarket
/ us-gaap_DebtInstrumentAxis
= cfr_PrivateAccountsMember
Time accounts of $100,000 or more, Percentage of Total 2.00%cfr_PercentageOfTimeAccountsOf100000OrMoreDeposits
/ us-gaap_DebtInstrumentAxis
= cfr_PrivateAccountsMember
2.00%cfr_PercentageOfTimeAccountsOf100000OrMoreDeposits
/ us-gaap_DebtInstrumentAxis
= cfr_PrivateAccountsMember
Time accounts under $100,000, Percentage of Total 1.80%cfr_PercentageOfTimeAccountsUnder100000ToDeposits
/ us-gaap_DebtInstrumentAxis
= cfr_PrivateAccountsMember
1.90%cfr_PercentageOfTimeAccountsUnder100000ToDeposits
/ us-gaap_DebtInstrumentAxis
= cfr_PrivateAccountsMember
Total private accounts, Percentage of Total 56.80%cfr_PercentageOfNonInterestBearingDemandDepositsToDeposit
/ us-gaap_DebtInstrumentAxis
= cfr_PrivateAccountsMember
56.20%cfr_PercentageOfNonInterestBearingDemandDepositsToDeposit
/ us-gaap_DebtInstrumentAxis
= cfr_PrivateAccountsMember
Public Funds [Member]    
Deposit [Line Items]    
Total non-interest-bearing demand deposits 477,496us-gaap_NoninterestBearingDepositLiabilities
/ us-gaap_DebtInstrumentAxis
= cfr_PublicFundsMember
464,016us-gaap_NoninterestBearingDepositLiabilities
/ us-gaap_DebtInstrumentAxis
= cfr_PublicFundsMember
Savings and interest checking 297,449us-gaap_DepositsSavingsDeposits
/ us-gaap_DebtInstrumentAxis
= cfr_PublicFundsMember
326,090us-gaap_DepositsSavingsDeposits
/ us-gaap_DebtInstrumentAxis
= cfr_PublicFundsMember
Money market accounts 53,003us-gaap_DepositsMoneyMarketDeposits
/ us-gaap_DebtInstrumentAxis
= cfr_PublicFundsMember
57,145us-gaap_DepositsMoneyMarketDeposits
/ us-gaap_DebtInstrumentAxis
= cfr_PublicFundsMember
Time accounts of $100,000 or more 47,711us-gaap_TimeDeposits100000OrMoreDomestic
/ us-gaap_DebtInstrumentAxis
= cfr_PublicFundsMember
53,684us-gaap_TimeDeposits100000OrMoreDomestic
/ us-gaap_DebtInstrumentAxis
= cfr_PublicFundsMember
Time accounts under $100,000 1,233us-gaap_TimeDepositsLessThan100000
/ us-gaap_DebtInstrumentAxis
= cfr_PublicFundsMember
1,155us-gaap_TimeDepositsLessThan100000
/ us-gaap_DebtInstrumentAxis
= cfr_PublicFundsMember
Total public funds $ 399,396cfr_InterestBearingDepositsPublicFunds
/ us-gaap_DebtInstrumentAxis
= cfr_PublicFundsMember
$ 438,074cfr_InterestBearingDepositsPublicFunds
/ us-gaap_DebtInstrumentAxis
= cfr_PublicFundsMember
Total non-interest-bearing demand deposits, Percentage of Total 2.00%cfr_PercentageOfNonInterestBearingDemandDepositsToDeposits
/ us-gaap_DebtInstrumentAxis
= cfr_PublicFundsMember
1.90%cfr_PercentageOfNonInterestBearingDemandDepositsToDeposits
/ us-gaap_DebtInstrumentAxis
= cfr_PublicFundsMember
Savings and interest checking, Percentage of Total 1.30%us-gaap_PercentageOfInterestBearingDomesticDepositsToDepositsSavings
/ us-gaap_DebtInstrumentAxis
= cfr_PublicFundsMember
1.40%us-gaap_PercentageOfInterestBearingDomesticDepositsToDepositsSavings
/ us-gaap_DebtInstrumentAxis
= cfr_PublicFundsMember
Money market accounts, Percentage of Total 0.20%us-gaap_PercentageOfInterestBearingDomesticDepositsToDepositsMoneyMarket
/ us-gaap_DebtInstrumentAxis
= cfr_PublicFundsMember
0.20%us-gaap_PercentageOfInterestBearingDomesticDepositsToDepositsMoneyMarket
/ us-gaap_DebtInstrumentAxis
= cfr_PublicFundsMember
Time accounts under $100,000, Percentage of Total 0.00%cfr_PercentageOfTimeAccountsUnder100000ToDeposits
/ us-gaap_DebtInstrumentAxis
= cfr_PublicFundsMember
0.00%cfr_PercentageOfTimeAccountsUnder100000ToDeposits
/ us-gaap_DebtInstrumentAxis
= cfr_PublicFundsMember
Time accounts of $100,000 or more, Percentage of Total 0.20%cfr_PercentageOfTimeAccountsOf100000OrMoreToDeposits
/ us-gaap_DebtInstrumentAxis
= cfr_PublicFundsMember
0.20%cfr_PercentageOfTimeAccountsOf100000OrMoreToDeposits
/ us-gaap_DebtInstrumentAxis
= cfr_PublicFundsMember
Total public funds, Percentage of Total 1.70%cfr_PercentageOfPublicFundsToDeposits
/ us-gaap_DebtInstrumentAxis
= cfr_PublicFundsMember
1.80%cfr_PercentageOfPublicFundsToDeposits
/ us-gaap_DebtInstrumentAxis
= cfr_PublicFundsMember