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Acquisitions - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Jun. 30, 2014	Dec. 31, 2014	May 30, 2014
Business Acquisition [Line Items]
Goodwill	$ 654,668,000us-gaap_Goodwill			$ 654,668,000us-gaap_Goodwill
Noninterest Expense	171,511,000us-gaap_NoninterestExpense	157,941,000us-gaap_NoninterestExpense
WNB Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Goodwill	718,000us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = cfr_WNBBancsharesInc.Member				118,019,000us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = cfr_WNBBancsharesInc.Member
Goodwill, Purchase Accounting Adjustments	718,000us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_BusinessAcquisitionAxis = cfr_WNBBancsharesInc.Member
Purchase price allocation					198,798,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = cfr_WNBBancsharesInc.Member
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned					149,700,000us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned / us-gaap_BusinessAcquisitionAxis = cfr_WNBBancsharesInc.Member
Common stock number of shares issued for consideration			2,000,000us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued / us-gaap_BusinessAcquisitionAxis = cfr_WNBBancsharesInc.Member
Amount of cash consideration			49,100,000us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = cfr_WNBBancsharesInc.Member
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	10 years
Acquisition-related Costs [Member]
Business Acquisition [Line Items]
Noninterest Expense		$ 1,100,000us-gaap_NoninterestExpense / us-gaap_BusinessAcquisitionAxis = us-gaap_AcquisitionRelatedCostsMember

X

- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity.

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Number of shares of equity interests issued or issuable to acquire entity.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Total aggregate amount of all noninterest expense.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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