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Deposits - Schedule of Deposits (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Deposit [Line Items] |  |
Total non-interest-bearing demand deposits | $ 10,031,950 us-gaap_NoninterestBearingDepositLiabilities | $ 10,149,061 us-gaap_NoninterestBearingDepositLiabilities
Total interest-bearing deposits | 14,117,672 us-gaap_InterestBearingDepositLiabilities | 13,986,869 us-gaap_InterestBearingDepositLiabilities
Total deposits | 24,149,622 us-gaap_Deposits | 24,135,930 us-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 | 9,186,477 us-gaap_NoninterestBearingDepositLiabilities / us-gaap_DebtInstrumentAxis = cfr_CommercialAndIndividualMember | 9,256,045 us-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 | 367,977 us-gaap_NoninterestBearingDepositLiabilities / us-gaap_DebtInstrumentAxis = cfr_CorrespondentBanksMember | 429,000 us-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 | 4,917,918 us-gaap_DepositsSavingsDeposits / us-gaap_DebtInstrumentAxis = cfr_PrivateAccountsMember | 4,743,963 us-gaap_DepositsSavingsDeposits / us-gaap_DebtInstrumentAxis = cfr_PrivateAccountsMember
Money market accounts | 7,889,909 us-gaap_DepositsMoneyMarketDeposits / us-gaap_DebtInstrumentAxis = cfr_PrivateAccountsMember | 7,860,403 us-gaap_DepositsMoneyMarketDeposits / us-gaap_DebtInstrumentAxis = cfr_PrivateAccountsMember
Time accounts of $100,000 or more | 480,604 us-gaap_TimeDeposits100000OrMoreDomestic / us-gaap_DebtInstrumentAxis = cfr_PrivateAccountsMember | 490,209 us-gaap_TimeDeposits100000OrMoreDomestic / us-gaap_DebtInstrumentAxis = cfr_PrivateAccountsMember
Time accounts under $100,000 | 429,845 us-gaap_TimeDepositsLessThan100000 / us-gaap_DebtInstrumentAxis = cfr_PrivateAccountsMember | 454,220 us-gaap_TimeDepositsLessThan100000 / us-gaap_DebtInstrumentAxis = cfr_PrivateAccountsMember
Total private accounts | 13,718,276 cfr_InterestBearingPrivateAccountsDeposits / us-gaap_DebtInstrumentAxis = cfr_PrivateAccountsMember | 13,548,795 cfr_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 | 477,496 us-gaap_NoninterestBearingDepositLiabilities / us-gaap_DebtInstrumentAxis = cfr_PublicFundsMember | 464,016 us-gaap_NoninterestBearingDepositLiabilities / us-gaap_DebtInstrumentAxis = cfr_PublicFundsMember
Savings and interest checking | 297,449 us-gaap_DepositsSavingsDeposits / us-gaap_DebtInstrumentAxis = cfr_PublicFundsMember | 326,090 us-gaap_DepositsSavingsDeposits / us-gaap_DebtInstrumentAxis = cfr_PublicFundsMember
Money market accounts | 53,003 us-gaap_DepositsMoneyMarketDeposits / us-gaap_DebtInstrumentAxis = cfr_PublicFundsMember | 57,145 us-gaap_DepositsMoneyMarketDeposits / us-gaap_DebtInstrumentAxis = cfr_PublicFundsMember
Time accounts of $100,000 or more | 47,711 us-gaap_TimeDeposits100000OrMoreDomestic / us-gaap_DebtInstrumentAxis = cfr_PublicFundsMember | 53,684 us-gaap_TimeDeposits100000OrMoreDomestic / us-gaap_DebtInstrumentAxis = cfr_PublicFundsMember
Time accounts under $100,000 | 1,233 us-gaap_TimeDepositsLessThan100000 / us-gaap_DebtInstrumentAxis = cfr_PublicFundsMember | 1,155 us-gaap_TimeDepositsLessThan100000 / us-gaap_DebtInstrumentAxis = cfr_PublicFundsMember
Total public funds | $ 399,396 cfr_InterestBearingDepositsPublicFunds / us-gaap_DebtInstrumentAxis = cfr_PublicFundsMember | $ 438,074 cfr_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

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- Definition The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of deposits in accounts that offer many of the same services as checking accounts although transactions may be somewhat more limited, share some of the characteristics of a money market fund and are insured by the Federal government, also known as money market accounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of interest bearing deposits with no stated maturity, which may include passbook and statement savings accounts and money-market deposit accounts (MMDAs). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The aggregate of all domestic and foreign interest-bearing deposit liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The aggregate amount of all domestic and foreign noninterest-bearing deposits liabilities held by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Percentage of interest-bearing domestic deposit liabilities to total deposit liabilities. + References No definition available. + Details
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- Definition Percentage of interest-bearing domestic money market demand account deposit liabilities to total deposit liabilities. + References No definition available. + Details
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- Definition Percentage of interest-bearing domestic savings deposit liabilities to total deposit liabilities. + References No definition available. + Details
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- Definition The aggregate amount of domestic time deposits (including certificates of deposits, individual retirement accounts and open accounts) in denominations of $100,000 or more. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=50488274&loc=d3e64164-112818 + Details
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