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

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Investment in subsidiaries.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks.

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The sum of cash and cash equivalents plus Federal Funds Sold. Cash and cash equivalents consist of short term, highly liquid investments that are readily convertible to known amounts of cash and are so near their maturity that they present negligible risk of changes in value due to changes in interest rates -- usually with an original maturity less than 90 days.

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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).

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Carrying amount of interest earned but not received (also called accrued interest or accrued interest receivable) and carrying amounts of assets not separately disclosed.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Junior Subordinated Notes, which have a lower priority than senior instruments.

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Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.

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Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any.

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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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