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Condensed Financial Statements of Parent Company (Schedule of Condensed Statements of Cash Flows) (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items] |  |  |
Net income | $ 277,977 us-gaap_NetIncomeLoss | $ 237,866 us-gaap_NetIncomeLoss | $ 237,952 us-gaap_NetIncomeLoss
Stock-based compensation | 12,503 us-gaap_ShareBasedCompensation | 11,963 us-gaap_ShareBasedCompensation | 12,836 us-gaap_ShareBasedCompensation
Excess tax benefits from stock-based compensation | (3,183)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities | (2,686)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities | (171)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Net cash from operating activities | 286,670 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | 173,606 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | 299,999 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Net cash received (paid) in acquisitions | 830,661 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | (1,896)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | (7,199)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Net cash from investing activities | (2,282,093)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations | (385,922)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations | (2,155,468)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Proceeds from stock option exercises | 29,158 us-gaap_ProceedsFromStockOptionsExercised | 68,653 us-gaap_ProceedsFromStockOptionsExercised | 10,516 us-gaap_ProceedsFromStockOptionsExercised
Excess tax benefits from stock-based compensation | 3,183 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | 2,686 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | 171 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Proceeds from issuance of preferred stock | 0 us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock | 144,486 us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock | 0 us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock
Purchase of treasury stock | (1,457)us-gaap_PaymentsForRepurchaseOfCommonStock | (144,630)us-gaap_PaymentsForRepurchaseOfCommonStock | (436)us-gaap_PaymentsForRepurchaseOfCommonStock
Cash dividends paid on preferred stock | (8,063)us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock | (6,719)us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock | 0 us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock
Cash dividends paid on common stock | (127,178)us-gaap_PaymentsOfDividendsCommonStock | (119,619)us-gaap_PaymentsOfDividendsCommonStock | (116,853)us-gaap_PaymentsOfDividendsCommonStock
Net cash from financing activities | 1,803,421 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations | 1,243,462 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations | 2,472,856 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net change in cash and cash equivalents | (192,002)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 1,031,146 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 617,387 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of year | 4,556,125 us-gaap_CashAndCashEquivalentsAtCarryingValue | 3,524,979 us-gaap_CashAndCashEquivalentsAtCarryingValue | 2,907,592 us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of year |  | 4,556,125 us-gaap_CashAndCashEquivalentsAtCarryingValue | 3,524,979 us-gaap_CashAndCashEquivalentsAtCarryingValue
Parent Company [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net income | 277,977 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 237,866 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 237,952 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Equity in undistributed earnings of subsidiaries | (165,569)cfr_EquityInUndistributedEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (97,756)cfr_EquityInUndistributedEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (99,887)cfr_EquityInUndistributedEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Stock-based compensation | 441 us-gaap_ShareBasedCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 330 us-gaap_ShareBasedCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 330 us-gaap_ShareBasedCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Excess tax benefits from stock-based compensation | (165)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (155)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (133)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net change in other assets and other liabilities | (1,984)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,372 us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (2,256)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash from operating activities | 110,700 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 142,657 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 136,006 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash received (paid) in acquisitions | 830,661 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Capital contribution to subsidiaries | (879,730)cfr_Capitalcontributionfromparenttosubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 cfr_Capitalcontributionfromparenttosubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 cfr_Capitalcontributionfromparenttosubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash from investing activities | (49,069)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Proceeds from stock option exercises | 29,158 us-gaap_ProceedsFromStockOptionsExercised / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 68,653 us-gaap_ProceedsFromStockOptionsExercised / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 10,516 us-gaap_ProceedsFromStockOptionsExercised / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Proceeds from stock-based compensation activities of subsidiaries | 12,062 us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 11,633 us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 12,506 us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Excess tax benefits from stock-based compensation | 165 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 155 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 133 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Proceeds from issuance of preferred stock | 0 us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 144,486 us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Purchase of treasury stock | (1,457)us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (144,630)us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (436)us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash dividends paid on preferred stock | (8,063)us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (6,719)us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash dividends paid on common stock | (127,178)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (119,619)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (116,853)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash from financing activities | (95,313)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (46,041)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (94,134)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net change in cash and cash equivalents | (33,682)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 96,616 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 41,872 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash and cash equivalents at beginning of year | 327,677 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 231,061 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 189,189 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash and cash equivalents at end of year | $ 293,995 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 327,677 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 231,061 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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- Definition Proceeds from issuance of capital stock which provides for a specific dividend that is paid to the shareholders before any dividends to common stockholders and which takes precedence over common stockholders in the event of liquidation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards other than stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References No definition available. + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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