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Deposits - Additional Information About Corporation's Deposits (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Banking and Thrift [Abstract] |  |
Deposits from the Certificate of Deposit Account Registry Service (CDARS) | $ 13,123 cfr_CertificateOfDepositAccountRegistryServiceCdarsDepositsHeld | $ 22,229 cfr_CertificateOfDepositAccountRegistryServiceCdarsDepositsHeld
Deposits from Promontory Interfinancial Network Insured Cash Sweep Service | 96,482 cfr_PromontoryInterfinancialNetworkInsuredCashSweepService | 148,665 cfr_PromontoryInterfinancialNetworkInsuredCashSweepService
Deposits from foreign sources (primarily Mexico) | $ 757,374 us-gaap_DepositsForeign | $ 744,295 us-gaap_DepositsForeign

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- Definition This element represents Certificate Of Deposit Account Registry Service (CDARS) deposits held + References No definition available. + Details
Name: | cfr_CertificateOfDepositAccountRegistryServiceCdarsDepositsHeld
Namespace Prefix: | cfr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Promontory Interfinancial Network Insured Cash Sweep Service + References No definition available. + Details
Name: | cfr_PromontoryInterfinancialNetworkInsuredCashSweepService
Namespace Prefix: | cfr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_BankingAndThriftAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The aggregate of all foreign interest-bearing and noninterest-bearing deposit liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-05(a)) -URI http://asc.fasb.org/extlink&oid=6882215&loc=d3e537907-122884 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_DepositsForeign
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant