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Income Taxes (Income Tax Computed by Applying U.S. Federal Statutory Income Tax Rate) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Income tax expense computed at the statutory rate	$ 117,608us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 101,808us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 107,966us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Effect of tax-exempt interest	(58,761)us-gaap_IncomeTaxReconciliationTaxExemptIncome	(46,535)us-gaap_IncomeTaxReconciliationTaxExemptIncome	(36,543)us-gaap_IncomeTaxReconciliationTaxExemptIncome
Bank owned life insurance income	(1,116)cfr_IncomeTaxReconciliationBankOwnedLifeInsuranceIncome	(1,086)cfr_IncomeTaxReconciliationBankOwnedLifeInsuranceIncome	(1,413)cfr_IncomeTaxReconciliationBankOwnedLifeInsuranceIncome
Other	316us-gaap_IncomeTaxReconciliationOtherAdjustments	(1,172)us-gaap_IncomeTaxReconciliationOtherAdjustments	513us-gaap_IncomeTaxReconciliationOtherAdjustments
Income tax expense, as reported	$ 58,047us-gaap_IncomeTaxExpenseBenefit	$ 53,015us-gaap_IncomeTaxExpenseBenefit	$ 70,523us-gaap_IncomeTaxExpenseBenefit

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Income Tax Reconciliation Bank Owned Life Insurance Income

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ 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.(h))

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph h

-Article 4



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Income Tax Expense (or Benefit)

-URI http://asc.fasb.org/extlink&oid=6515339



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (a),(b)

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

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-Section 50

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income (loss) exempt from income taxes.

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