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Deposits (Schedule of Deposits) (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Deposit [Line Items] |  |
Non-interest-bearing demand deposits: | $ 10,149,061 us-gaap_NoninterestBearingDepositLiabilities | $ 8,311,149 us-gaap_NoninterestBearingDepositLiabilities
Total Interest-bearing deposits | 13,986,869 us-gaap_InterestBearingDepositLiabilities | 12,377,637 us-gaap_InterestBearingDepositLiabilities
Total deposits | 24,135,930 us-gaap_Deposits | 20,688,786 us-gaap_Deposits
Commercial and Individual [Member] |  |
Deposit [Line Items] |  |
Non-interest-bearing demand deposits: | 9,256,045 us-gaap_NoninterestBearingDepositLiabilities / us-gaap_DebtInstrumentAxis = cfr_CommercialAndIndividualMember | 7,445,656 us-gaap_NoninterestBearingDepositLiabilities / us-gaap_DebtInstrumentAxis = cfr_CommercialAndIndividualMember
Correspondent Banks [Member] |  |
Deposit [Line Items] |  |
Non-interest-bearing demand deposits: | 429,000 us-gaap_NoninterestBearingDepositLiabilities / us-gaap_DebtInstrumentAxis = cfr_CorrespondentBanksMember | 427,134 us-gaap_NoninterestBearingDepositLiabilities / us-gaap_DebtInstrumentAxis = cfr_CorrespondentBanksMember
Private Accounts [Member] |  |
Deposit [Line Items] |  |
Savings and interest checking | 4,743,963 us-gaap_DepositsSavingsDeposits / us-gaap_DebtInstrumentAxis = cfr_PrivateAccountsMember | 4,020,313 us-gaap_DepositsSavingsDeposits / us-gaap_DebtInstrumentAxis = cfr_PrivateAccountsMember
Money market accounts | 7,860,403 us-gaap_DepositsMoneyMarketDeposits / us-gaap_DebtInstrumentAxis = cfr_PrivateAccountsMember | 6,883,869 us-gaap_DepositsMoneyMarketDeposits / us-gaap_DebtInstrumentAxis = cfr_PrivateAccountsMember
Time accounts of $100,000 or more | 490,209 us-gaap_TimeDeposits100000OrMoreDomestic / us-gaap_DebtInstrumentAxis = cfr_PrivateAccountsMember | 508,441 us-gaap_TimeDeposits100000OrMoreDomestic / us-gaap_DebtInstrumentAxis = cfr_PrivateAccountsMember
Time accounts under $100,000 | 454,220 us-gaap_TimeDepositsLessThan100000 / us-gaap_DebtInstrumentAxis = cfr_PrivateAccountsMember | 438,800 us-gaap_TimeDepositsLessThan100000 / us-gaap_DebtInstrumentAxis = cfr_PrivateAccountsMember
Total private accounts | 13,548,795 cfr_InterestBearingPrivateAccountsDeposits / us-gaap_DebtInstrumentAxis = cfr_PrivateAccountsMember | 11,851,423 cfr_InterestBearingPrivateAccountsDeposits / us-gaap_DebtInstrumentAxis = cfr_PrivateAccountsMember
Public Funds [Member] |  |
Deposit [Line Items] |  |
Non-interest-bearing demand deposits: | 464,016 us-gaap_NoninterestBearingDepositLiabilities / us-gaap_DebtInstrumentAxis = cfr_PublicFundsMember | 438,359 us-gaap_NoninterestBearingDepositLiabilities / us-gaap_DebtInstrumentAxis = cfr_PublicFundsMember
Savings and interest checking | 326,090 us-gaap_DepositsSavingsDeposits / us-gaap_DebtInstrumentAxis = cfr_PublicFundsMember | 305,976 us-gaap_DepositsSavingsDeposits / us-gaap_DebtInstrumentAxis = cfr_PublicFundsMember
Money market accounts | 57,145 us-gaap_DepositsMoneyMarketDeposits / us-gaap_DebtInstrumentAxis = cfr_PublicFundsMember | 56,015 us-gaap_DepositsMoneyMarketDeposits / us-gaap_DebtInstrumentAxis = cfr_PublicFundsMember
Time accounts of $100,000 or more | 53,684 us-gaap_TimeDeposits100000OrMoreDomestic / us-gaap_DebtInstrumentAxis = cfr_PublicFundsMember | 160,637 us-gaap_TimeDeposits100000OrMoreDomestic / us-gaap_DebtInstrumentAxis = cfr_PublicFundsMember
Time accounts under $100,000 | 1,155 us-gaap_TimeDepositsLessThan100000 / us-gaap_DebtInstrumentAxis = cfr_PublicFundsMember | 3,586 us-gaap_TimeDepositsLessThan100000 / us-gaap_DebtInstrumentAxis = cfr_PublicFundsMember
Total public funds | $ 438,074 cfr_InterestBearingDepositsPublicFunds / us-gaap_DebtInstrumentAxis = cfr_PublicFundsMember | $ 526,214 cfr_InterestBearingDepositsPublicFunds / 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 9 + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 9 + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 9 + 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=6479006&loc=d3e64164-112818 + Details
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