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Condensed Financial Statements of Parent Company (Schedule of Condensed Balance Sheets) (Detail) (USD $) | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | --- | --- | ---
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash | $ 702,485,000 us-gaap_CashAndDueFromBanks | $ 885,121,000 us-gaap_CashAndDueFromBanks |  |
Resell agreements | 30,792,000 us-gaap_FederalFundsSoldAndSecuritiesPurchasedUnderAgreementsToResell | 24,248,000 us-gaap_FederalFundsSoldAndSecuritiesPurchasedUnderAgreementsToResell |  |
Total cash and cash equivalents | 4,364,123,000 us-gaap_CashCashEquivalentsAndFederalFundsSold | 4,556,125,000 us-gaap_CashCashEquivalentsAndFederalFundsSold | 3,524,979,000 us-gaap_CashCashEquivalentsAndFederalFundsSold |
Total assets | 28,277,775,000 us-gaap_Assets | 24,312,939,000 us-gaap_Assets |  |
Junior subordinated deferrable interest debentures | 137,115,000 us-gaap_JuniorSubordinatedNotes | 123,712,000 us-gaap_JuniorSubordinatedNotes |  |
Accrued interest payable and other liabilities | 250,208,000 us-gaap_OtherLiabilities | 218,027,000 us-gaap_OtherLiabilities |  |
Total liabilities | 25,426,372,000 us-gaap_Liabilities | 21,798,778,000 us-gaap_Liabilities |  |
Shareholders’ Equity | 2,851,403,000 us-gaap_StockholdersEquity | 2,514,161,000 us-gaap_StockholdersEquity | 2,417,482,000 us-gaap_StockholdersEquity | 2,283,537,000 us-gaap_StockholdersEquity
Total liabilities and shareholders’ equity | 28,277,775,000 us-gaap_LiabilitiesAndStockholdersEquity | 24,312,939,000 us-gaap_LiabilitiesAndStockholdersEquity |  |
Parent Company [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash | 7,335,000 us-gaap_CashAndDueFromBanks / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 7,477,000 us-gaap_CashAndDueFromBanks / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Resell agreements | 286,660,000 us-gaap_FederalFundsSoldAndSecuritiesPurchasedUnderAgreementsToResell / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 320,200,000 us-gaap_FederalFundsSoldAndSecuritiesPurchasedUnderAgreementsToResell / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total cash and cash equivalents | 293,995,000 us-gaap_CashCashEquivalentsAndFederalFundsSold / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 327,677,000 us-gaap_CashCashEquivalentsAndFederalFundsSold / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Investment in subsidiaries | 2,791,647,000 cfr_InvestmentInSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,409,433,000 cfr_InvestmentInSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Accrued interest receivable and other assets | 29,705,000 us-gaap_InterestReceivableAndOtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 19,038,000 us-gaap_InterestReceivableAndOtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total assets | 3,115,347,000 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,756,148,000 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Junior subordinated deferrable interest debentures | 137,115,000 us-gaap_JuniorSubordinatedNotes / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 123,712,000 us-gaap_JuniorSubordinatedNotes / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Subordinated notes payable | 100,000,000 us-gaap_NotesPayable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 100,000,000 us-gaap_NotesPayable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Accrued interest payable and other liabilities | 26,829,000 us-gaap_OtherLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 18,275,000 us-gaap_OtherLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total liabilities | 263,944,000 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 241,987,000 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Shareholders’ Equity | 2,851,403,000 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,514,161,000 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total liabilities and shareholders’ equity | $ 3,115,347,000 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 2,756,148,000 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |

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- Definition Includes: (1) the amount outstanding of funds lent to other depository institutions, securities brokers, or securities dealers in the form of Federal Funds sold; for example, immediately available funds lent under agreements or contracts that mature in one business day or roll over under a continuing contract, regardless of the nature of the transaction or the collateral involved, excluding overnight lending for commercial and industrial purposes. Also include Federal Funds sold under agreements to resell on a gross basis, excluding (1) sales of term Federal Funds, (2) due bills representing purchases of securities or other assets by the reporting bank that have not yet been delivered and similar instruments, (3) resale agreements that mature in more than one business day involving assets other than securities, and (4) yield maintenance dollar repurchase agreements (Federal Funds Sold) and (2) the dollar amount outstanding of funds lent in the form of security resale agreements regardless of maturity, if the agreement requires the bank to resell the identical security purchased or a security that meets the definition of substantially the same in the case of a dollar roll. Also include purchases of participations in pools of securities, regardless of maturity (Securities Purchased Under Agreements to Re-sell). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(2)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph m -Subparagraph 1(i) -Article 4 + Details
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